Merge branch 'batman-adv/next' of git://git.open-mesh.org/ecsv/linux-merge

31 files changed, 284 insertions, 276 deletions

diff --git a/net/batman-adv/aggregation.c b/net/batman-adv/aggregation.c
index a8c3203..b41f25b 100644
--- a/net/batman-adv/aggregation.c
+++ b/net/batman-adv/aggregation.c
@@ -26,18 +26,18 @@
 #include "hard-interface.h"
 
 /* calculate the size of the tt information for a given packet */
-static int tt_len(struct batman_packet *batman_packet)
+static int tt_len(const struct batman_packet *batman_packet)
 {
 	return batman_packet->num_tt * ETH_ALEN;
 }
 
 /* return true if new_packet can be aggregated with forw_packet */
-static bool can_aggregate_with(struct batman_packet *new_batman_packet,
+static bool can_aggregate_with(const struct batman_packet *new_batman_packet,
 			       int packet_len,
 			       unsigned long send_time,
 			       bool directlink,
-			       struct hard_iface *if_incoming,
-			       struct forw_packet *forw_packet)
+			       const struct hard_iface *if_incoming,
+			       const struct forw_packet *forw_packet)
 {
 	struct batman_packet *batman_packet =
 		(struct batman_packet *)forw_packet->skb->data;
@@ -97,8 +97,9 @@ static bool can_aggregate_with(struct batman_packet *new_batman_packet,
 }
 
 /* create a new aggregated packet and add this packet to it */
-static void new_aggregated_packet(unsigned char *packet_buff, int packet_len,
-				  unsigned long send_time, bool direct_link,
+static void new_aggregated_packet(const unsigned char *packet_buff,
+				  int packet_len, unsigned long send_time,
+				  bool direct_link,
 				  struct hard_iface *if_incoming,
 				  int own_packet)
 {
@@ -118,7 +119,7 @@ static void new_aggregated_packet(unsigned char *packet_buff, int packet_len,
 		}
 	}
 
-	forw_packet_aggr = kmalloc(sizeof(struct forw_packet), GFP_ATOMIC);
+	forw_packet_aggr = kmalloc(sizeof(*forw_packet_aggr), GFP_ATOMIC);
 	if (!forw_packet_aggr) {
 		if (!own_packet)
 			atomic_inc(&bat_priv->batman_queue_left);
@@ -176,8 +177,7 @@ out:
 
 /* aggregate a new packet into the existing aggregation */
 static void aggregate(struct forw_packet *forw_packet_aggr,
-		      unsigned char *packet_buff,
-		      int packet_len,
+		      const unsigned char *packet_buff, int packet_len,
 		      bool direct_link)
 {
 	unsigned char *skb_buff;
@@ -253,8 +253,9 @@ void add_bat_packet_to_list(struct bat_priv *bat_priv,
 }
 
 /* unpack the aggregated packets and process them one by one */
-void receive_aggr_bat_packet(struct ethhdr *ethhdr, unsigned char *packet_buff,
-			     int packet_len, struct hard_iface *if_incoming)
+void receive_aggr_bat_packet(const struct ethhdr *ethhdr,
+			     unsigned char *packet_buff, int packet_len,
+			     struct hard_iface *if_incoming)
 {
 	struct batman_packet *batman_packet;
 	int buff_pos = 0;
diff --git a/net/batman-adv/aggregation.h b/net/batman-adv/aggregation.h
index 7e6d72f..fedeb8d 100644
--- a/net/batman-adv/aggregation.h
+++ b/net/batman-adv/aggregation.h
@@ -37,7 +37,8 @@ void add_bat_packet_to_list(struct bat_priv *bat_priv,
 			    unsigned char *packet_buff, int packet_len,
 			    struct hard_iface *if_incoming, char own_packet,
 			    unsigned long send_time);
-void receive_aggr_bat_packet(struct ethhdr *ethhdr, unsigned char *packet_buff,
-			     int packet_len, struct hard_iface *if_incoming);
+void receive_aggr_bat_packet(const struct ethhdr *ethhdr,
+			     unsigned char *packet_buff, int packet_len,
+			     struct hard_iface *if_incoming);
 
 #endif /* _NET_BATMAN_ADV_AGGREGATION_H_ */
diff --git a/net/batman-adv/bat_debugfs.c b/net/batman-adv/bat_debugfs.c
index abaeec5..d0af9bf 100644
--- a/net/batman-adv/bat_debugfs.c
+++ b/net/batman-adv/bat_debugfs.c
@@ -50,7 +50,8 @@ static void emit_log_char(struct debug_log *debug_log, char c)
 		debug_log->log_start = debug_log->log_end - log_buff_len;
 }
 
-static int fdebug_log(struct debug_log *debug_log, char *fmt, ...)
+__printf(2, 3)
+static int fdebug_log(struct debug_log *debug_log, const char *fmt, ...)
 {
 	va_list args;
 	static char debug_log_buf[256];
@@ -74,14 +75,14 @@ static int fdebug_log(struct debug_log *debug_log, char *fmt, ...)
 	return 0;
 }
 
-int debug_log(struct bat_priv *bat_priv, char *fmt, ...)
+int debug_log(struct bat_priv *bat_priv, const char *fmt, ...)
 {
 	va_list args;
 	char tmp_log_buf[256];
 
 	va_start(args, fmt);
 	vscnprintf(tmp_log_buf, sizeof(tmp_log_buf), fmt, args);
-	fdebug_log(bat_priv->debug_log, "[%10u] %s",
+	fdebug_log(bat_priv->debug_log, "[%10lu] %s",
 		   (jiffies / HZ), tmp_log_buf);
 	va_end(args);
 
@@ -114,7 +115,7 @@ static ssize_t log_read(struct file *file, char __user *buf,
 	    !(debug_log->log_end - debug_log->log_start))
 		return -EAGAIN;
 
-	if ((!buf) || (count < 0))
+	if (!buf)
 		return -EINVAL;
 
 	if (count == 0)
@@ -184,7 +185,7 @@ static int debug_log_setup(struct bat_priv *bat_priv)
 	if (!bat_priv->debug_dir)
 		goto err;
 
-	bat_priv->debug_log = kzalloc(sizeof(struct debug_log), GFP_ATOMIC);
+	bat_priv->debug_log = kzalloc(sizeof(*bat_priv->debug_log), GFP_ATOMIC);
 	if (!bat_priv->debug_log)
 		goto err;
 
diff --git a/net/batman-adv/bat_sysfs.c b/net/batman-adv/bat_sysfs.c
index 497a070..6f70560 100644
--- a/net/batman-adv/bat_sysfs.c
+++ b/net/batman-adv/bat_sysfs.c
@@ -96,7 +96,7 @@ ssize_t show_##_name(struct kobject *kobj, struct attribute *attr,	\
 
 static int store_bool_attr(char *buff, size_t count,
 			   struct net_device *net_dev,
-			   char *attr_name, atomic_t *attr)
+			   const char *attr_name, atomic_t *attr)
 {
 	int enabled = -1;
 
@@ -138,16 +138,15 @@ static inline ssize_t __store_bool_attr(char *buff, size_t count,
 {
 	int ret;
 
-	ret = store_bool_attr(buff, count, net_dev, (char *)attr->name,
-			      attr_store);
+	ret = store_bool_attr(buff, count, net_dev, attr->name, attr_store);
 	if (post_func && ret)
 		post_func(net_dev);
 
 	return ret;
 }
 
-static int store_uint_attr(char *buff, size_t count,
-			   struct net_device *net_dev, char *attr_name,
+static int store_uint_attr(const char *buff, size_t count,
+			   struct net_device *net_dev, const char *attr_name,
 			   unsigned int min, unsigned int max, atomic_t *attr)
 {
 	unsigned long uint_val;
@@ -183,15 +182,15 @@ static int store_uint_attr(char *buff, size_t count,
 	return count;
 }
 
-static inline ssize_t __store_uint_attr(char *buff, size_t count,
+static inline ssize_t __store_uint_attr(const char *buff, size_t count,
 			int min, int max,
 			void (*post_func)(struct net_device *),
-			struct attribute *attr,
+			const struct attribute *attr,
 			atomic_t *attr_store, struct net_device *net_dev)
 {
 	int ret;
 
-	ret = store_uint_attr(buff, count, net_dev, (char *)attr->name,
+	ret = store_uint_attr(buff, count, net_dev, attr->name,
 			      min, max, attr_store);
 	if (post_func && ret)
 		post_func(net_dev);
diff --git a/net/batman-adv/bitarray.c b/net/batman-adv/bitarray.c
index ad2ca92..700ee4f 100644
--- a/net/batman-adv/bitarray.c
+++ b/net/batman-adv/bitarray.c
@@ -26,7 +26,7 @@
 
 /* returns true if the corresponding bit in the given seq_bits indicates true
  * and curr_seqno is within range of last_seqno */
-uint8_t get_bit_status(unsigned long *seq_bits, uint32_t last_seqno,
+uint8_t get_bit_status(const unsigned long *seq_bits, uint32_t last_seqno,
 		       uint32_t curr_seqno)
 {
 	int32_t diff, word_offset, word_num;
@@ -130,7 +130,7 @@ static void bit_reset_window(unsigned long *seq_bits)
 char bit_get_packet(void *priv, unsigned long *seq_bits,
 		    int32_t seq_num_diff, int8_t set_mark)
 {
-	struct bat_priv *bat_priv = (struct bat_priv *)priv;
+	struct bat_priv *bat_priv = priv;
 
 	/* sequence number is slightly older. We already got a sequence number
 	 * higher than this one, so we just mark it. */
@@ -190,7 +190,7 @@ char bit_get_packet(void *priv, unsigned long *seq_bits,
 /* count the hamming weight, how many good packets did we receive? just count
  * the 1's.
  */
-int bit_packet_count(unsigned long *seq_bits)
+int bit_packet_count(const unsigned long *seq_bits)
 {
 	int i, hamming = 0;
 
diff --git a/net/batman-adv/bitarray.h b/net/batman-adv/bitarray.h
index 769c246..e32eb2d 100644
--- a/net/batman-adv/bitarray.h
+++ b/net/batman-adv/bitarray.h
@@ -26,8 +26,8 @@
 
 /* returns true if the corresponding bit in the given seq_bits indicates true
  * and curr_seqno is within range of last_seqno */
-uint8_t get_bit_status(unsigned long *seq_bits, uint32_t last_seqno,
-					   uint32_t curr_seqno);
+uint8_t get_bit_status(const unsigned long *seq_bits, uint32_t last_seqno,
+		       uint32_t curr_seqno);
 
 /* turn corresponding bit on, so we can remember that we got the packet */
 void bit_mark(unsigned long *seq_bits, int32_t n);
@@ -39,6 +39,6 @@ char bit_get_packet(void *priv, unsigned long *seq_bits,
 		    int32_t seq_num_diff, int8_t set_mark);
 
 /* count the hamming weight, how many good packets did we receive? */
-int  bit_packet_count(unsigned long *seq_bits);
+int bit_packet_count(const unsigned long *seq_bits);
 
 #endif /* _NET_BATMAN_ADV_BITARRAY_H_ */
diff --git a/net/batman-adv/gateway_client.c b/net/batman-adv/gateway_client.c
index 61605a0..ab597c4 100644
--- a/net/batman-adv/gateway_client.c
+++ b/net/batman-adv/gateway_client.c
@@ -86,7 +86,7 @@ static void gw_select(struct bat_priv *bat_priv, struct gw_node *new_gw_node)
 	if (new_gw_node && !atomic_inc_not_zero(&new_gw_node->refcount))
 		new_gw_node = NULL;
 
-	curr_gw_node = bat_priv->curr_gw;
+	curr_gw_node = rcu_dereference_protected(bat_priv->curr_gw, 1);
 	rcu_assign_pointer(bat_priv->curr_gw, new_gw_node);
 
 	if (curr_gw_node)
@@ -273,11 +273,10 @@ static void gw_node_add(struct bat_priv *bat_priv,
 	struct gw_node *gw_node;
 	int down, up;
 
-	gw_node = kmalloc(sizeof(struct gw_node), GFP_ATOMIC);
+	gw_node = kzalloc(sizeof(*gw_node), GFP_ATOMIC);
 	if (!gw_node)
 		return;
 
-	memset(gw_node, 0, sizeof(struct gw_node));
 	INIT_HLIST_NODE(&gw_node->list);
 	gw_node->orig_node = orig_node;
 	atomic_set(&gw_node->refcount, 1);
@@ -394,8 +393,8 @@ void gw_node_purge(struct bat_priv *bat_priv)
 /**
  * fails if orig_node has no router
  */
-static int _write_buffer_text(struct bat_priv *bat_priv,
-			      struct seq_file *seq, struct gw_node *gw_node)
+static int _write_buffer_text(struct bat_priv *bat_priv, struct seq_file *seq,
+			      const struct gw_node *gw_node)
 {
 	struct gw_node *curr_gw;
 	struct neigh_node *router;
@@ -509,7 +508,7 @@ int gw_is_target(struct bat_priv *bat_priv, struct sk_buff *skb)
 	/* check for ip header */
 	switch (ntohs(ethhdr->h_proto)) {
 	case ETH_P_IP:
-		if (!pskb_may_pull(skb, header_len + sizeof(struct iphdr)))
+		if (!pskb_may_pull(skb, header_len + sizeof(*iphdr)))
 			return 0;
 		iphdr = (struct iphdr *)(skb->data + header_len);
 		header_len += iphdr->ihl * 4;
@@ -520,10 +519,10 @@ int gw_is_target(struct bat_priv *bat_priv, struct sk_buff *skb)
 
 		break;
 	case ETH_P_IPV6:
-		if (!pskb_may_pull(skb, header_len + sizeof(struct ipv6hdr)))
+		if (!pskb_may_pull(skb, header_len + sizeof(*ipv6hdr)))
 			return 0;
 		ipv6hdr = (struct ipv6hdr *)(skb->data + header_len);
-		header_len += sizeof(struct ipv6hdr);
+		header_len += sizeof(*ipv6hdr);
 
 		/* check for udp header */
 		if (ipv6hdr->nexthdr != IPPROTO_UDP)
@@ -534,10 +533,10 @@ int gw_is_target(struct bat_priv *bat_priv, struct sk_buff *skb)
 		return 0;
 	}
 
-	if (!pskb_may_pull(skb, header_len + sizeof(struct udphdr)))
+	if (!pskb_may_pull(skb, header_len + sizeof(*udphdr)))
 		return 0;
 	udphdr = (struct udphdr *)(skb->data + header_len);
-	header_len += sizeof(struct udphdr);
+	header_len += sizeof(*udphdr);
 
 	/* check for bootp port */
 	if ((ntohs(ethhdr->h_proto) == ETH_P_IP) &&
diff --git a/net/batman-adv/gateway_common.c b/net/batman-adv/gateway_common.c
index 50d3a59..ed3bd36 100644
--- a/net/batman-adv/gateway_common.c
+++ b/net/batman-adv/gateway_common.c
@@ -76,10 +76,11 @@ void gw_bandwidth_to_kbit(uint8_t gw_srv_class, int *down, int *up)
 }
 
 static bool parse_gw_bandwidth(struct net_device *net_dev, char *buff,
-			       long *up, long *down)
+			       int *up, int *down)
 {
 	int ret, multi = 1;
 	char *slash_ptr, *tmp_ptr;
+	long ldown, lup;
 
 	slash_ptr = strchr(buff, '/');
 	if (slash_ptr)
@@ -96,7 +97,7 @@ static bool parse_gw_bandwidth(struct net_device *net_dev, char *buff,
 			*tmp_ptr = '\0';
 	}
 
-	ret = strict_strtoul(buff, 10, down);
+	ret = strict_strtoul(buff, 10, &ldown);
 	if (ret) {
 		bat_err(net_dev,
 			"Download speed of gateway mode invalid: %s\n",
@@ -104,7 +105,7 @@ static bool parse_gw_bandwidth(struct net_device *net_dev, char *buff,
 		return false;
 	}
 
-	*down *= multi;
+	*down = ldown * multi;
 
 	/* we also got some upload info */
 	if (slash_ptr) {
@@ -121,7 +122,7 @@ static bool parse_gw_bandwidth(struct net_device *net_dev, char *buff,
 				*tmp_ptr = '\0';
 		}
 
-		ret = strict_strtoul(slash_ptr + 1, 10, up);
+		ret = strict_strtoul(slash_ptr + 1, 10, &lup);
 		if (ret) {
 			bat_err(net_dev,
 				"Upload speed of gateway mode invalid: "
@@ -129,7 +130,7 @@ static bool parse_gw_bandwidth(struct net_device *net_dev, char *buff,
 			return false;
 		}
 
-		*up *= multi;
+		*up = lup * multi;
 	}
 
 	return true;
@@ -138,7 +139,8 @@ static bool parse_gw_bandwidth(struct net_device *net_dev, char *buff,
 ssize_t gw_bandwidth_set(struct net_device *net_dev, char *buff, size_t count)
 {
 	struct bat_priv *bat_priv = netdev_priv(net_dev);
-	long gw_bandwidth_tmp = 0, up = 0, down = 0;
+	long gw_bandwidth_tmp = 0;
+	int up = 0, down = 0;
 	bool ret;
 
 	ret = parse_gw_bandwidth(net_dev, buff, &up, &down);
@@ -158,12 +160,11 @@ ssize_t gw_bandwidth_set(struct net_device *net_dev, char *buff, size_t count)
 	 * speeds, hence we need to calculate it back to show the number
 	 * that is going to be propagated
 	 **/
-	gw_bandwidth_to_kbit((uint8_t)gw_bandwidth_tmp,
-			     (int *)&down, (int *)&up);
+	gw_bandwidth_to_kbit((uint8_t)gw_bandwidth_tmp, &down, &up);
 
 	gw_deselect(bat_priv);
 	bat_info(net_dev, "Changing gateway bandwidth from: '%i' to: '%ld' "
-		 "(propagating: %ld%s/%ld%s)\n",
+		 "(propagating: %d%s/%d%s)\n",
 		 atomic_read(&bat_priv->gw_bandwidth), gw_bandwidth_tmp,
 		 (down > 2048 ? down / 1024 : down),
 		 (down > 2048 ? "MBit" : "KBit"),
diff --git a/net/batman-adv/hard-interface.c b/net/batman-adv/hard-interface.c
index dfbfccc..a3fbfb5 100644
--- a/net/batman-adv/hard-interface.c
+++ b/net/batman-adv/hard-interface.c
@@ -46,7 +46,7 @@ void hardif_free_rcu(struct rcu_head *rcu)
 	kfree(hard_iface);
 }
 
-struct hard_iface *hardif_get_by_netdev(struct net_device *net_dev)
+struct hard_iface *hardif_get_by_netdev(const struct net_device *net_dev)
 {
 	struct hard_iface *hard_iface;
 
@@ -64,7 +64,7 @@ out:
 	return hard_iface;
 }
 
-static int is_valid_iface(struct net_device *net_dev)
+static int is_valid_iface(const struct net_device *net_dev)
 {
 	if (net_dev->flags & IFF_LOOPBACK)
 		return 0;
@@ -86,7 +86,7 @@ static int is_valid_iface(struct net_device *net_dev)
 	return 1;
 }
 
-static struct hard_iface *hardif_get_active(struct net_device *soft_iface)
+static struct hard_iface *hardif_get_active(const struct net_device *soft_iface)
 {
 	struct hard_iface *hard_iface;
 
@@ -138,7 +138,7 @@ static void primary_if_select(struct bat_priv *bat_priv,
 	if (new_hard_iface && !atomic_inc_not_zero(&new_hard_iface->refcount))
 		new_hard_iface = NULL;
 
-	curr_hard_iface = bat_priv->primary_if;
+	curr_hard_iface = rcu_dereference_protected(bat_priv->primary_if, 1);
 	rcu_assign_pointer(bat_priv->primary_if, new_hard_iface);
 
 	if (curr_hard_iface)
@@ -160,7 +160,7 @@ static void primary_if_select(struct bat_priv *bat_priv,
 	atomic_set(&bat_priv->tt_local_changed, 1);
 }
 
-static bool hardif_is_iface_up(struct hard_iface *hard_iface)
+static bool hardif_is_iface_up(const struct hard_iface *hard_iface)
 {
 	if (hard_iface->net_dev->flags & IFF_UP)
 		return true;
@@ -176,9 +176,9 @@ static void update_mac_addresses(struct hard_iface *hard_iface)
 	       hard_iface->net_dev->dev_addr, ETH_ALEN);
 }
 
-static void check_known_mac_addr(struct net_device *net_dev)
+static void check_known_mac_addr(const struct net_device *net_dev)
 {
-	struct hard_iface *hard_iface;
+	const struct hard_iface *hard_iface;
 
 	rcu_read_lock();
 	list_for_each_entry_rcu(hard_iface, &hardif_list, list) {
@@ -204,8 +204,8 @@ static void check_known_mac_addr(struct net_device *net_dev)
 
 int hardif_min_mtu(struct net_device *soft_iface)
 {
-	struct bat_priv *bat_priv = netdev_priv(soft_iface);
-	struct hard_iface *hard_iface;
+	const struct bat_priv *bat_priv = netdev_priv(soft_iface);
+	const struct hard_iface *hard_iface;
 	/* allow big frames if all devices are capable to do so
 	 * (have MTU > 1500 + BAT_HEADER_LEN) */
 	int min_mtu = ETH_DATA_LEN;
@@ -285,7 +285,8 @@ static void hardif_deactivate_interface(struct hard_iface *hard_iface)
 	update_min_mtu(hard_iface->soft_iface);
 }
 
-int hardif_enable_interface(struct hard_iface *hard_iface, char *iface_name)
+int hardif_enable_interface(struct hard_iface *hard_iface,
+			    const char *iface_name)
 {
 	struct bat_priv *bat_priv;
 	struct batman_packet *batman_packet;
@@ -458,7 +459,7 @@ static struct hard_iface *hardif_add_interface(struct net_device *net_dev)
 
 	dev_hold(net_dev);
 
-	hard_iface = kmalloc(sizeof(struct hard_iface), GFP_ATOMIC);
+	hard_iface = kmalloc(sizeof(*hard_iface), GFP_ATOMIC);
 	if (!hard_iface) {
 		pr_err("Can't add interface (%s): out of memory\n",
 		       net_dev->name);
@@ -522,7 +523,7 @@ void hardif_remove_interfaces(void)
 static int hard_if_event(struct notifier_block *this,
 			 unsigned long event, void *ptr)
 {
-	struct net_device *net_dev = (struct net_device *)ptr;
+	struct net_device *net_dev = ptr;
 	struct hard_iface *hard_iface = hardif_get_by_netdev(net_dev);
 	struct hard_iface *primary_if = NULL;
 	struct bat_priv *bat_priv;
diff --git a/net/batman-adv/hard-interface.h b/net/batman-adv/hard-interface.h
index 6426599..79e25cb 100644
--- a/net/batman-adv/hard-interface.h
+++ b/net/batman-adv/hard-interface.h
@@ -31,8 +31,10 @@
 
 extern struct notifier_block hard_if_notifier;
 
-struct hard_iface *hardif_get_by_netdev(struct net_device *net_dev);
-int hardif_enable_interface(struct hard_iface *hard_iface, char *iface_name);
+struct hard_iface*
+hardif_get_by_netdev(const struct net_device *net_dev);
+int hardif_enable_interface(struct hard_iface *hard_iface,
+			    const char *iface_name);
 void hardif_disable_interface(struct hard_iface *hard_iface);
 void hardif_remove_interfaces(void);
 int hardif_min_mtu(struct net_device *soft_iface);
diff --git a/net/batman-adv/hash.c b/net/batman-adv/hash.c
index c5213d8..2a17250 100644
--- a/net/batman-adv/hash.c
+++ b/net/batman-adv/hash.c
@@ -46,15 +46,16 @@ struct hashtable_t *hash_new(int size)
 {
 	struct hashtable_t *hash;
 
-	hash = kmalloc(sizeof(struct hashtable_t), GFP_ATOMIC);
+	hash = kmalloc(sizeof(*hash), GFP_ATOMIC);
 	if (!hash)
 		return NULL;
 
-	hash->table = kmalloc(sizeof(struct element_t *) * size, GFP_ATOMIC);
+	hash->table = kmalloc(sizeof(*hash->table) * size, GFP_ATOMIC);
 	if (!hash->table)
 		goto free_hash;
 
-	hash->list_locks = kmalloc(sizeof(spinlock_t) * size, GFP_ATOMIC);
+	hash->list_locks = kmalloc(sizeof(*hash->list_locks) * size,
+				   GFP_ATOMIC);
 	if (!hash->list_locks)
 		goto free_table;
 
diff --git a/net/batman-adv/hash.h b/net/batman-adv/hash.h
index 434822b..dd5c9fd 100644
--- a/net/batman-adv/hash.h
+++ b/net/batman-adv/hash.h
@@ -28,12 +28,12 @@
  * compare 2 element datas for their keys,
  * return 0 if same and not 0 if not
  * same */
-typedef int (*hashdata_compare_cb)(struct hlist_node *, void *);
+typedef int (*hashdata_compare_cb)(const struct hlist_node *, const void *);
 
 /* the hashfunction, should return an index
  * based on the key in the data of the first
  * argument and the size the second */
-typedef int (*hashdata_choose_cb)(void *, int);
+typedef int (*hashdata_choose_cb)(const void *, int);
 typedef void (*hashdata_free_cb)(struct hlist_node *, void *);
 
 struct hashtable_t {
@@ -80,7 +80,7 @@ static inline void hash_delete(struct hashtable_t *hash,
 static inline int hash_add(struct hashtable_t *hash,
 			   hashdata_compare_cb compare,
 			   hashdata_choose_cb choose,
-			   void *data, struct hlist_node *data_node)
+			   const void *data, struct hlist_node *data_node)
 {
 	int index;
 	struct hlist_head *head;
diff --git a/net/batman-adv/icmp_socket.c b/net/batman-adv/icmp_socket.c
index fa22ba2..ac3520e 100644
--- a/net/batman-adv/icmp_socket.c
+++ b/net/batman-adv/icmp_socket.c
@@ -46,7 +46,7 @@ static int bat_socket_open(struct inode *inode, struct file *file)
 
 	nonseekable_open(inode, file);
 
-	socket_client = kmalloc(sizeof(struct socket_client), GFP_KERNEL);
+	socket_client = kmalloc(sizeof(*socket_client), GFP_KERNEL);
 
 	if (!socket_client)
 		return -ENOMEM;
@@ -310,7 +310,7 @@ static void bat_socket_add_packet(struct socket_client *socket_client,
 {
 	struct socket_packet *socket_packet;
 
-	socket_packet = kmalloc(sizeof(struct socket_packet), GFP_ATOMIC);
+	socket_packet = kmalloc(sizeof(*socket_packet), GFP_ATOMIC);
 
 	if (!socket_packet)
 		return;
diff --git a/net/batman-adv/main.c b/net/batman-adv/main.c
index 0a7cee0..2d6445e 100644
--- a/net/batman-adv/main.c
+++ b/net/batman-adv/main.c
@@ -155,9 +155,9 @@ void dec_module_count(void)
 	module_put(THIS_MODULE);
 }
 
-int is_my_mac(uint8_t *addr)
+int is_my_mac(const uint8_t *addr)
 {
-	struct hard_iface *hard_iface;
+	const struct hard_iface *hard_iface;
 
 	rcu_read_lock();
 	list_for_each_entry_rcu(hard_iface, &hardif_list, list) {
diff --git a/net/batman-adv/main.h b/net/batman-adv/main.h
index 148b49e..610eaf0 100644
--- a/net/batman-adv/main.h
+++ b/net/batman-adv/main.h
@@ -133,10 +133,10 @@ int mesh_init(struct net_device *soft_iface);
 void mesh_free(struct net_device *soft_iface);
 void inc_module_count(void);
 void dec_module_count(void);
-int is_my_mac(uint8_t *addr);
+int is_my_mac(const uint8_t *addr);
 
 #ifdef CONFIG_BATMAN_ADV_DEBUG
-int debug_log(struct bat_priv *bat_priv, char *fmt, ...);
+int debug_log(struct bat_priv *bat_priv, const char *fmt, ...) __printf(2, 3);
 
 #define bat_dbg(type, bat_priv, fmt, arg...)			\
 	do {							\
@@ -145,9 +145,10 @@ int debug_log(struct bat_priv *bat_priv, char *fmt, ...);
 	}							\
 	while (0)
 #else /* !CONFIG_BATMAN_ADV_DEBUG */
+__printf(3, 4)
 static inline void bat_dbg(char type __always_unused,
 			   struct bat_priv *bat_priv __always_unused,
-			   char *fmt __always_unused, ...)
+			   const char *fmt __always_unused, ...)
 {
 }
 #endif
@@ -172,11 +173,32 @@ static inline void bat_dbg(char type __always_unused,
  *
  * note: can't use compare_ether_addr() as it requires aligned memory
  */
-static inline int compare_eth(void *data1, void *data2)
+
+static inline int compare_eth(const void *data1, const void *data2)
 {
 	return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0);
 }
 
+
 #define atomic_dec_not_zero(v)	atomic_add_unless((v), -1, 0)
 
+/* Returns the smallest signed integer in two's complement with the sizeof x */
+#define smallest_signed_int(x) (1u << (7u + 8u * (sizeof(x) - 1u)))
+
+/* Checks if a sequence number x is a predecessor/successor of y.
+ * they handle overflows/underflows and can correctly check for a
+ * predecessor/successor unless the variable sequence number has grown by
+ * more then 2**(bitwidth(x)-1)-1.
+ * This means that for a uint8_t with the maximum value 255, it would think:
+ *  - when adding nothing - it is neither a predecessor nor a successor
+ *  - before adding more than 127 to the starting value - it is a predecessor,
+ *  - when adding 128 - it is neither a predecessor nor a successor,
+ *  - after adding more than 127 to the starting value - it is a successor */
+#define seq_before(x, y) ({typeof(x) _d1 = (x); \
+			  typeof(y) _d2 = (y); \
+			  typeof(x) _dummy = (_d1 - _d2); \
+			  (void) (&_d1 == &_d2); \
+			  _dummy > smallest_signed_int(_dummy); })
+#define seq_after(x, y) seq_before(y, x)
+
 #endif /* _NET_BATMAN_ADV_MAIN_H_ */
diff --git a/net/batman-adv/originator.c b/net/batman-adv/originator.c
index 40a30bb..a6c35d4 100644
--- a/net/batman-adv/originator.c
+++ b/net/batman-adv/originator.c
@@ -77,7 +77,7 @@ struct neigh_node *orig_node_get_router(struct orig_node *orig_node)
 
 struct neigh_node *create_neighbor(struct orig_node *orig_node,
 				   struct orig_node *orig_neigh_node,
-				   uint8_t *neigh,
+				   const uint8_t *neigh,
 				   struct hard_iface *if_incoming)
 {
 	struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
@@ -86,7 +86,7 @@ struct neigh_node *create_neighbor(struct orig_node *orig_node,
 	bat_dbg(DBG_BATMAN, bat_priv,
 		"Creating new last-hop neighbor of originator\n");
 
-	neigh_node = kzalloc(sizeof(struct neigh_node), GFP_ATOMIC);
+	neigh_node = kzalloc(sizeof(*neigh_node), GFP_ATOMIC);
 	if (!neigh_node)
 		return NULL;
 
@@ -183,7 +183,7 @@ void originator_free(struct bat_priv *bat_priv)
 
 /* this function finds or creates an originator entry for the given
  * address if it does not exits */
-struct orig_node *get_orig_node(struct bat_priv *bat_priv, uint8_t *addr)
+struct orig_node *get_orig_node(struct bat_priv *bat_priv, const uint8_t *addr)
 {
 	struct orig_node *orig_node;
 	int size;
@@ -196,7 +196,7 @@ struct orig_node *get_orig_node(struct bat_priv *bat_priv, uint8_t *addr)
 	bat_dbg(DBG_BATMAN, bat_priv,
 		"Creating new originator: %pM\n", addr);
 
-	orig_node = kzalloc(sizeof(struct orig_node), GFP_ATOMIC);
+	orig_node = kzalloc(sizeof(*orig_node), GFP_ATOMIC);
 	if (!orig_node)
 		return NULL;
 
@@ -559,7 +559,7 @@ static int orig_node_del_if(struct orig_node *orig_node,
 	memcpy(data_ptr, orig_node->bcast_own, del_if_num * chunk_size);
 
 	/* copy second part */
-	memcpy(data_ptr + del_if_num * chunk_size,
+	memcpy((char *)data_ptr + del_if_num * chunk_size,
 	       orig_node->bcast_own + ((del_if_num + 1) * chunk_size),
 	       (max_if_num - del_if_num) * chunk_size);
 
@@ -579,7 +579,7 @@ free_bcast_own:
 	memcpy(data_ptr, orig_node->bcast_own_sum,
 	       del_if_num * sizeof(uint8_t));
 
-	memcpy(data_ptr + del_if_num * sizeof(uint8_t),
+	memcpy((char *)data_ptr + del_if_num * sizeof(uint8_t),
 	       orig_node->bcast_own_sum + ((del_if_num + 1) * sizeof(uint8_t)),
 	       (max_if_num - del_if_num) * sizeof(uint8_t));
 
diff --git a/net/batman-adv/originator.h b/net/batman-adv/originator.h
index e1d641f..8e307af 100644
--- a/net/batman-adv/originator.h
+++ b/net/batman-adv/originator.h
@@ -28,10 +28,10 @@ int originator_init(struct bat_priv *bat_priv);
 void originator_free(struct bat_priv *bat_priv);
 void purge_orig_ref(struct bat_priv *bat_priv);
 void orig_node_free_ref(struct orig_node *orig_node);
-struct orig_node *get_orig_node(struct bat_priv *bat_priv, uint8_t *addr);
+struct orig_node *get_orig_node(struct bat_priv *bat_priv, const uint8_t *addr);
 struct neigh_node *create_neighbor(struct orig_node *orig_node,
 				   struct orig_node *orig_neigh_node,
-				   uint8_t *neigh,
+				   const uint8_t *neigh,
 				   struct hard_iface *if_incoming);
 void neigh_node_free_ref(struct neigh_node *neigh_node);
 struct neigh_node *orig_node_get_router(struct orig_node *orig_node);
@@ -41,18 +41,18 @@ int orig_hash_del_if(struct hard_iface *hard_iface, int max_if_num);
 
 
 /* returns 1 if they are the same originator */
-static inline int compare_orig(struct hlist_node *node, void *data2)
+static inline int compare_orig(const struct hlist_node *node, const void *data2)
 {
-	void *data1 = container_of(node, struct orig_node, hash_entry);
+	const void *data1 = container_of(node, struct orig_node, hash_entry);
 
 	return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0);
 }
 
 /* hashfunction to choose an entry in a hash table of given size */
 /* hash algorithm from http://en.wikipedia.org/wiki/Hash_table */
-static inline int choose_orig(void *data, int32_t size)
+static inline int choose_orig(const void *data, int32_t size)
 {
-	unsigned char *key = data;
+	const unsigned char *key = data;
 	uint32_t hash = 0;
 	size_t i;
 
@@ -70,7 +70,7 @@ static inline int choose_orig(void *data, int32_t size)
 }
 
 static inline struct orig_node *orig_hash_find(struct bat_priv *bat_priv,
-					       void *data)
+					       const void *data)
 {
 	struct hashtable_t *hash = bat_priv->orig_hash;
 	struct hlist_head *head;
diff --git a/net/batman-adv/ring_buffer.c b/net/batman-adv/ring_buffer.c
index 5bb6a61..f1ccfa7 100644
--- a/net/batman-adv/ring_buffer.c
+++ b/net/batman-adv/ring_buffer.c
@@ -28,9 +28,9 @@ void ring_buffer_set(uint8_t lq_recv[], uint8_t *lq_index, uint8_t value)
 	*lq_index = (*lq_index + 1) % TQ_GLOBAL_WINDOW_SIZE;
 }
 
-uint8_t ring_buffer_avg(uint8_t lq_recv[])
+uint8_t ring_buffer_avg(const uint8_t lq_recv[])
 {
-	uint8_t *ptr;
+	const uint8_t *ptr;
 	uint16_t count = 0, i = 0, sum = 0;
 
 	ptr = lq_recv;
diff --git a/net/batman-adv/ring_buffer.h b/net/batman-adv/ring_buffer.h
index 0395b27..7cdfe62 100644
--- a/net/batman-adv/ring_buffer.h
+++ b/net/batman-adv/ring_buffer.h
@@ -23,6 +23,6 @@
 #define _NET_BATMAN_ADV_RING_BUFFER_H_
 
 void ring_buffer_set(uint8_t lq_recv[], uint8_t *lq_index, uint8_t value);
-uint8_t ring_buffer_avg(uint8_t lq_recv[]);
+uint8_t ring_buffer_avg(const uint8_t lq_recv[]);
 
 #endif /* _NET_BATMAN_ADV_RING_BUFFER_H_ */
diff --git a/net/batman-adv/routing.c b/net/batman-adv/routing.c
index bb1c3ec..368ceeb 100644
--- a/net/batman-adv/routing.c
+++ b/net/batman-adv/routing.c
@@ -65,7 +65,7 @@ void slide_own_bcast_window(struct hard_iface *hard_iface)
 }
 
 static void update_TT(struct bat_priv *bat_priv, struct orig_node *orig_node,
-		       unsigned char *tt_buff, int tt_buff_len)
+		      const unsigned char *tt_buff, int tt_buff_len)
 {
 	if ((tt_buff_len != orig_node->tt_buff_len) ||
 	    ((tt_buff_len > 0) &&
@@ -82,10 +82,9 @@ static void update_TT(struct bat_priv *bat_priv, struct orig_node *orig_node,
 	}
 }
 
-static void update_route(struct bat_priv *bat_priv,
-			 struct orig_node *orig_node,
+static void update_route(struct bat_priv *bat_priv, struct orig_node *orig_node,
 			 struct neigh_node *neigh_node,
-			 unsigned char *tt_buff, int tt_buff_len)
+			 const unsigned char *tt_buff, int tt_buff_len)
 {
 	struct neigh_node *curr_router;
 
@@ -109,7 +108,7 @@ static void update_route(struct bat_priv *bat_priv,
 				    tt_buff, tt_buff_len);
 
 	/* route changed */
-	} else {
+	} else if (neigh_node && curr_router) {
 		bat_dbg(DBG_ROUTES, bat_priv,
 			"Changing route towards: %pM "
 			"(now via %pM - was via %pM)\n",
@@ -133,9 +132,8 @@ static void update_route(struct bat_priv *bat_priv,
 		neigh_node_free_ref(curr_router);
 }
 
-
 void update_routes(struct bat_priv *bat_priv, struct orig_node *orig_node,
-		   struct neigh_node *neigh_node, unsigned char *tt_buff,
+		   struct neigh_node *neigh_node, const unsigned char *tt_buff,
 		   int tt_buff_len)
 {
 	struct neigh_node *router = NULL;
@@ -348,9 +346,9 @@ out:
 }
 
 /* copy primary address for bonding */
-static void bonding_save_primary(struct orig_node *orig_node,
+static void bonding_save_primary(const struct orig_node *orig_node,
 				 struct orig_node *orig_neigh_node,
-				 struct batman_packet *batman_packet)
+				 const struct batman_packet *batman_packet)
 {
 	if (!(batman_packet->flags & PRIMARIES_FIRST_HOP))
 		return;
@@ -358,12 +356,11 @@ static void bonding_save_primary(struct orig_node *orig_node,
 	memcpy(orig_neigh_node->primary_addr, orig_node->orig, ETH_ALEN);
 }
 
-static void update_orig(struct bat_priv *bat_priv,
-			struct orig_node *orig_node,
-			struct ethhdr *ethhdr,
-			struct batman_packet *batman_packet,
+static void update_orig(struct bat_priv *bat_priv, struct orig_node *orig_node,
+			const struct ethhdr *ethhdr,
+			const struct batman_packet *batman_packet,
 			struct hard_iface *if_incoming,
-			unsigned char *tt_buff, int tt_buff_len,
+			const unsigned char *tt_buff, int tt_buff_len,
 			char is_duplicate)
 {
 	struct neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL;
@@ -531,9 +528,9 @@ static int window_protected(struct bat_priv *bat_priv,
  *  -1 the packet is old and has been received while the seqno window
  *     was protected. Caller should drop it.
  */
-static char count_real_packets(struct ethhdr *ethhdr,
-			       struct batman_packet *batman_packet,
-			       struct hard_iface *if_incoming)
+static char count_real_packets(const struct ethhdr *ethhdr,
+			       const struct batman_packet *batman_packet,
+			       const struct hard_iface *if_incoming)
 {
 	struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 	struct orig_node *orig_node;
@@ -595,9 +592,9 @@ out:
 	return ret;
 }
 
-void receive_bat_packet(struct ethhdr *ethhdr,
+void receive_bat_packet(const struct ethhdr *ethhdr,
 			struct batman_packet *batman_packet,
-			unsigned char *tt_buff, int tt_buff_len,
+			const unsigned char *tt_buff, int tt_buff_len,
 			struct hard_iface *if_incoming)
 {
 	struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
@@ -664,7 +661,7 @@ void receive_bat_packet(struct ethhdr *ethhdr,
 				hard_iface->net_dev->dev_addr))
 			is_my_oldorig = 1;
 
-		if (compare_eth(ethhdr->h_source, broadcast_addr))
+		if (is_broadcast_ether_addr(ethhdr->h_source))
 			is_broadcast = 1;
 	}
 	rcu_read_unlock();
@@ -1077,7 +1074,7 @@ out:
  * This method rotates the bonding list and increases the
  * returned router's refcount. */
 static struct neigh_node *find_bond_router(struct orig_node *primary_orig,
-					   struct hard_iface *recv_if)
+					   const struct hard_iface *recv_if)
 {
 	struct neigh_node *tmp_neigh_node;
 	struct neigh_node *router = NULL, *first_candidate = NULL;
@@ -1128,7 +1125,7 @@ out:
  *
  * Increases the returned router's refcount */
 static struct neigh_node *find_ifalter_router(struct orig_node *primary_orig,
-					      struct hard_iface *recv_if)
+					      const struct hard_iface *recv_if)
 {
 	struct neigh_node *tmp_neigh_node;
 	struct neigh_node *router = NULL, *first_candidate = NULL;
@@ -1176,7 +1173,7 @@ static struct neigh_node *find_ifalter_router(struct orig_node *primary_orig,
  * refcount.*/
 struct neigh_node *find_router(struct bat_priv *bat_priv,
 			       struct orig_node *orig_node,
-			       struct hard_iface *recv_if)
+			       const struct hard_iface *recv_if)
 {
 	struct orig_node *primary_orig_node;
 	struct orig_node *router_orig;
@@ -1240,6 +1237,9 @@ struct neigh_node *find_router(struct bat_priv *bat_priv,
 		router = find_ifalter_router(primary_orig_node, recv_if);
 
 return_router:
+	if (router && router->if_incoming->if_status != IF_ACTIVE)
+		goto err_unlock;
+
 	rcu_read_unlock();
 	return router;
 err_unlock:
@@ -1357,7 +1357,7 @@ out:
 int recv_unicast_packet(struct sk_buff *skb, struct hard_iface *recv_if)
 {
 	struct unicast_packet *unicast_packet;
-	int hdr_size = sizeof(struct unicast_packet);
+	int hdr_size = sizeof(*unicast_packet);
 
 	if (check_unicast_packet(skb, hdr_size) < 0)
 		return NET_RX_DROP;
@@ -1377,7 +1377,7 @@ int recv_ucast_frag_packet(struct sk_buff *skb, struct hard_iface *recv_if)
 {
 	struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
 	struct unicast_frag_packet *unicast_packet;
-	int hdr_size = sizeof(struct unicast_frag_packet);
+	int hdr_size = sizeof(*unicast_packet);
 	struct sk_buff *new_skb = NULL;
 	int ret;
 
@@ -1413,7 +1413,7 @@ int recv_bcast_packet(struct sk_buff *skb, struct hard_iface *recv_if)
 	struct orig_node *orig_node = NULL;
 	struct bcast_packet *bcast_packet;
 	struct ethhdr *ethhdr;
-	int hdr_size = sizeof(struct bcast_packet);
+	int hdr_size = sizeof(*bcast_packet);
 	int ret = NET_RX_DROP;
 	int32_t seq_diff;
 
@@ -1491,7 +1491,7 @@ int recv_vis_packet(struct sk_buff *skb, struct hard_iface *recv_if)
 	struct vis_packet *vis_packet;
 	struct ethhdr *ethhdr;
 	struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
-	int hdr_size = sizeof(struct vis_packet);
+	int hdr_size = sizeof(*vis_packet);
 
 	/* keep skb linear */
 	if (skb_linearize(skb) < 0)
diff --git a/net/batman-adv/routing.h b/net/batman-adv/routing.h
index 870f298..0ce0392 100644
--- a/net/batman-adv/routing.h
+++ b/net/batman-adv/routing.h
@@ -23,12 +23,12 @@
 #define _NET_BATMAN_ADV_ROUTING_H_
 
 void slide_own_bcast_window(struct hard_iface *hard_iface);
-void receive_bat_packet(struct ethhdr *ethhdr,
-				struct batman_packet *batman_packet,
-				unsigned char *tt_buff, int tt_buff_len,
-				struct hard_iface *if_incoming);
+void receive_bat_packet(const struct ethhdr *ethhdr,
+			struct batman_packet *batman_packet,
+			const unsigned char *tt_buff, int tt_buff_len,
+			struct hard_iface *if_incoming);
 void update_routes(struct bat_priv *bat_priv, struct orig_node *orig_node,
-		   struct neigh_node *neigh_node, unsigned char *tt_buff,
+		   struct neigh_node *neigh_node, const unsigned char *tt_buff,
 		   int tt_buff_len);
 int route_unicast_packet(struct sk_buff *skb, struct hard_iface *recv_if);
 int recv_icmp_packet(struct sk_buff *skb, struct hard_iface *recv_if);
@@ -39,7 +39,7 @@ int recv_vis_packet(struct sk_buff *skb, struct hard_iface *recv_if);
 int recv_bat_packet(struct sk_buff *skb, struct hard_iface *recv_if);
 struct neigh_node *find_router(struct bat_priv *bat_priv,
 			       struct orig_node *orig_node,
-			       struct hard_iface *recv_if);
+			       const struct hard_iface *recv_if);
 void bonding_candidate_del(struct orig_node *orig_node,
 			   struct neigh_node *neigh_node);
 
diff --git a/net/batman-adv/send.c b/net/batman-adv/send.c
index 3377927..d0cfa95 100644
--- a/net/batman-adv/send.c
+++ b/net/batman-adv/send.c
@@ -33,14 +33,14 @@
 static void send_outstanding_bcast_packet(struct work_struct *work);
 
 /* apply hop penalty for a normal link */
-static uint8_t hop_penalty(const uint8_t tq, struct bat_priv *bat_priv)
+static uint8_t hop_penalty(uint8_t tq, const struct bat_priv *bat_priv)
 {
 	int hop_penalty = atomic_read(&bat_priv->hop_penalty);
 	return (tq * (TQ_MAX_VALUE - hop_penalty)) / (TQ_MAX_VALUE);
 }
 
 /* when do we schedule our own packet to be sent */
-static unsigned long own_send_time(struct bat_priv *bat_priv)
+static unsigned long own_send_time(const struct bat_priv *bat_priv)
 {
 	return jiffies + msecs_to_jiffies(
 		   atomic_read(&bat_priv->orig_interval) -
@@ -55,9 +55,8 @@ static unsigned long forward_send_time(void)
 
 /* send out an already prepared packet to the given address via the
  * specified batman interface */
-int send_skb_packet(struct sk_buff *skb,
-				struct hard_iface *hard_iface,
-				uint8_t *dst_addr)
+int send_skb_packet(struct sk_buff *skb, struct hard_iface *hard_iface,
+		    const uint8_t *dst_addr)
 {
 	struct ethhdr *ethhdr;
 
@@ -74,7 +73,7 @@ int send_skb_packet(struct sk_buff *skb,
 	}
 
 	/* push to the ethernet header. */
-	if (my_skb_head_push(skb, sizeof(struct ethhdr)) < 0)
+	if (my_skb_head_push(skb, sizeof(*ethhdr)) < 0)
 		goto send_skb_err;
 
 	skb_reset_mac_header(skb);
@@ -145,7 +144,7 @@ static void send_packet_to_if(struct forw_packet *forw_packet,
 			hard_iface->net_dev->name,
 			hard_iface->net_dev->dev_addr);
 
-		buff_pos += sizeof(struct batman_packet) +
+		buff_pos += sizeof(*batman_packet) +
 			(batman_packet->num_tt * ETH_ALEN);
 		packet_num++;
 		batman_packet = (struct batman_packet *)
@@ -221,19 +220,18 @@ static void rebuild_batman_packet(struct bat_priv *bat_priv,
 	unsigned char *new_buff;
 	struct batman_packet *batman_packet;
 
-	new_len = sizeof(struct batman_packet) +
-			(bat_priv->num_local_tt * ETH_ALEN);
+	new_len = sizeof(*batman_packet) + (bat_priv->num_local_tt * ETH_ALEN);
 	new_buff = kmalloc(new_len, GFP_ATOMIC);
 
 	/* keep old buffer if kmalloc should fail */
 	if (new_buff) {
 		memcpy(new_buff, hard_iface->packet_buff,
-		       sizeof(struct batman_packet));
+		       sizeof(*batman_packet));
 		batman_packet = (struct batman_packet *)new_buff;
 
 		batman_packet->num_tt = tt_local_fill_buffer(bat_priv,
-				new_buff + sizeof(struct batman_packet),
-				new_len - sizeof(struct batman_packet));
+					new_buff + sizeof(*batman_packet),
+					new_len - sizeof(*batman_packet));
 
 		kfree(hard_iface->packet_buff);
 		hard_iface->packet_buff = new_buff;
@@ -307,7 +305,7 @@ void schedule_own_packet(struct hard_iface *hard_iface)
 }
 
 void schedule_forward_packet(struct orig_node *orig_node,
-			     struct ethhdr *ethhdr,
+			     const struct ethhdr *ethhdr,
 			     struct batman_packet *batman_packet,
 			     uint8_t directlink, int tt_buff_len,
 			     struct hard_iface *if_incoming)
@@ -369,7 +367,7 @@ void schedule_forward_packet(struct orig_node *orig_node,
 	send_time = forward_send_time();
 	add_bat_packet_to_list(bat_priv,
 			       (unsigned char *)batman_packet,
-			       sizeof(struct batman_packet) + tt_buff_len,
+			       sizeof(*batman_packet) + tt_buff_len,
 			       if_incoming, 0, send_time);
 }
 
@@ -408,11 +406,13 @@ static void _add_bcast_packet_to_list(struct bat_priv *bat_priv,
  *
  * The skb is not consumed, so the caller should make sure that the
  * skb is freed. */
-int add_bcast_packet_to_list(struct bat_priv *bat_priv, struct sk_buff *skb)
+int add_bcast_packet_to_list(struct bat_priv *bat_priv,
+			     const struct sk_buff *skb)
 {
 	struct hard_iface *primary_if = NULL;
 	struct forw_packet *forw_packet;
 	struct bcast_packet *bcast_packet;
+	struct sk_buff *newskb;
 
 	if (!atomic_dec_not_zero(&bat_priv->bcast_queue_left)) {
 		bat_dbg(DBG_BATMAN, bat_priv, "bcast packet queue full\n");
@@ -423,22 +423,22 @@ int add_bcast_packet_to_list(struct bat_priv *bat_priv, struct sk_buff *skb)
 	if (!primary_if)
 		goto out_and_inc;
 
-	forw_packet = kmalloc(sizeof(struct forw_packet), GFP_ATOMIC);
+	forw_packet = kmalloc(sizeof(*forw_packet), GFP_ATOMIC);
 
 	if (!forw_packet)
 		goto out_and_inc;
 
-	skb = skb_copy(skb, GFP_ATOMIC);
-	if (!skb)
+	newskb = skb_copy(skb, GFP_ATOMIC);
+	if (!newskb)
 		goto packet_free;
 
 	/* as we have a copy now, it is safe to decrease the TTL */
-	bcast_packet = (struct bcast_packet *)skb->data;
+	bcast_packet = (struct bcast_packet *)newskb->data;
 	bcast_packet->ttl--;
 
-	skb_reset_mac_header(skb);
+	skb_reset_mac_header(newskb);
 
-	forw_packet->skb = skb;
+	forw_packet->skb = newskb;
 	forw_packet->if_incoming = primary_if;
 
 	/* how often did we send the bcast packet ? */
@@ -537,7 +537,7 @@ out:
 }
 
 void purge_outstanding_packets(struct bat_priv *bat_priv,
-			       struct hard_iface *hard_iface)
+			       const struct hard_iface *hard_iface)
 {
 	struct forw_packet *forw_packet;
 	struct hlist_node *tmp_node, *safe_tmp_node;
diff --git a/net/batman-adv/send.h b/net/batman-adv/send.h
index 247172d..eceab87 100644
--- a/net/batman-adv/send.h
+++ b/net/batman-adv/send.h
@@ -22,18 +22,18 @@
 #ifndef _NET_BATMAN_ADV_SEND_H_
 #define _NET_BATMAN_ADV_SEND_H_
 
-int send_skb_packet(struct sk_buff *skb,
-				struct hard_iface *hard_iface,
-				uint8_t *dst_addr);
+int send_skb_packet(struct sk_buff *skb, struct hard_iface *hard_iface,
+		    const uint8_t *dst_addr);
 void schedule_own_packet(struct hard_iface *hard_iface);
 void schedule_forward_packet(struct orig_node *orig_node,
-			     struct ethhdr *ethhdr,
+			     const struct ethhdr *ethhdr,
 			     struct batman_packet *batman_packet,
 			     uint8_t directlink, int tt_buff_len,
 			     struct hard_iface *if_outgoing);
-int add_bcast_packet_to_list(struct bat_priv *bat_priv, struct sk_buff *skb);
+int add_bcast_packet_to_list(struct bat_priv *bat_priv,
+			     const struct sk_buff *skb);
 void send_outstanding_bat_packet(struct work_struct *work);
 void purge_outstanding_packets(struct bat_priv *bat_priv,
-			       struct hard_iface *hard_iface);
+			       const struct hard_iface *hard_iface);
 
 #endif /* _NET_BATMAN_ADV_SEND_H_ */
diff --git a/net/batman-adv/soft-interface.c b/net/batman-adv/soft-interface.c
index d5aa609..b8d3f248 100644
--- a/net/batman-adv/soft-interface.c
+++ b/net/batman-adv/soft-interface.c
@@ -123,8 +123,7 @@ static struct softif_neigh_vid *softif_neigh_vid_get(struct bat_priv *bat_priv,
 		goto out;
 	}
 
-	softif_neigh_vid = kzalloc(sizeof(struct softif_neigh_vid),
-				   GFP_ATOMIC);
+	softif_neigh_vid = kzalloc(sizeof(*softif_neigh_vid), GFP_ATOMIC);
 	if (!softif_neigh_vid)
 		goto out;
 
@@ -146,7 +145,7 @@ out:
 }
 
 static struct softif_neigh *softif_neigh_get(struct bat_priv *bat_priv,
-					     uint8_t *addr, short vid)
+					     const uint8_t *addr, short vid)
 {
 	struct softif_neigh_vid *softif_neigh_vid;
 	struct softif_neigh *softif_neigh = NULL;
@@ -170,7 +169,7 @@ static struct softif_neigh *softif_neigh_get(struct bat_priv *bat_priv,
 		goto unlock;
 	}
 
-	softif_neigh = kzalloc(sizeof(struct softif_neigh), GFP_ATOMIC);
+	softif_neigh = kzalloc(sizeof(*softif_neigh), GFP_ATOMIC);
 	if (!softif_neigh)
 		goto unlock;
 
@@ -242,7 +241,8 @@ static void softif_neigh_vid_select(struct bat_priv *bat_priv,
 	if (new_neigh && !atomic_inc_not_zero(&new_neigh->refcount))
 		new_neigh = NULL;
 
-	curr_neigh = softif_neigh_vid->softif_neigh;
+	curr_neigh = rcu_dereference_protected(softif_neigh_vid->softif_neigh,
+					       1);
 	rcu_assign_pointer(softif_neigh_vid->softif_neigh, new_neigh);
 
 	if ((curr_neigh) && (!new_neigh))
@@ -611,7 +611,7 @@ int interface_tx(struct sk_buff *skb, struct net_device *soft_iface)
 		if (!primary_if)
 			goto dropped;
 
-		if (my_skb_head_push(skb, sizeof(struct bcast_packet)) < 0)
+		if (my_skb_head_push(skb, sizeof(*bcast_packet)) < 0)
 			goto dropped;
 
 		bcast_packet = (struct bcast_packet *)skb->data;
@@ -790,17 +790,16 @@ static void interface_setup(struct net_device *dev)
 
 	SET_ETHTOOL_OPS(dev, &bat_ethtool_ops);
 
-	memset(priv, 0, sizeof(struct bat_priv));
+	memset(priv, 0, sizeof(*priv));
 }
 
-struct net_device *softif_create(char *name)
+struct net_device *softif_create(const char *name)
 {
 	struct net_device *soft_iface;
 	struct bat_priv *bat_priv;
 	int ret;
 
-	soft_iface = alloc_netdev(sizeof(struct bat_priv) , name,
-				   interface_setup);
+	soft_iface = alloc_netdev(sizeof(*bat_priv), name, interface_setup);
 
 	if (!soft_iface) {
 		pr_err("Unable to allocate the batman interface: %s\n", name);
@@ -872,7 +871,7 @@ void softif_destroy(struct net_device *soft_iface)
 	unregister_netdevice(soft_iface);
 }
 
-int softif_is_valid(struct net_device *net_dev)
+int softif_is_valid(const struct net_device *net_dev)
 {
 #ifdef HAVE_NET_DEVICE_OPS
 	if (net_dev->netdev_ops->ndo_start_xmit == interface_tx)
@@ -924,4 +923,3 @@ static u32 bat_get_link(struct net_device *dev)
 {
 	return 1;
 }
-
diff --git a/net/batman-adv/soft-interface.h b/net/batman-adv/soft-interface.h
index 4789b6f..c24906d 100644
--- a/net/batman-adv/soft-interface.h
+++ b/net/batman-adv/soft-interface.h
@@ -29,8 +29,8 @@ int interface_tx(struct sk_buff *skb, struct net_device *soft_iface);
 void interface_rx(struct net_device *soft_iface,
 		  struct sk_buff *skb, struct hard_iface *recv_if,
 		  int hdr_size);
-struct net_device *softif_create(char *name);
+struct net_device *softif_create(const char *name);
 void softif_destroy(struct net_device *soft_iface);
-int softif_is_valid(struct net_device *net_dev);
+int softif_is_valid(const struct net_device *net_dev);
 
 #endif /* _NET_BATMAN_ADV_SOFT_INTERFACE_H_ */
diff --git a/net/batman-adv/translation-table.c b/net/batman-adv/translation-table.c
index 7b72966..561f769 100644
--- a/net/batman-adv/translation-table.c
+++ b/net/batman-adv/translation-table.c
@@ -29,20 +29,22 @@
 static void tt_local_purge(struct work_struct *work);
 static void _tt_global_del_orig(struct bat_priv *bat_priv,
 				 struct tt_global_entry *tt_global_entry,
-				 char *message);
+				 const char *message);
 
 /* returns 1 if they are the same mac addr */
-static int compare_ltt(struct hlist_node *node, void *data2)
+static int compare_ltt(const struct hlist_node *node, const void *data2)
 {
-	void *data1 = container_of(node, struct tt_local_entry, hash_entry);
+	const void *data1 = container_of(node, struct tt_local_entry,
+					 hash_entry);
 
 	return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0);
 }
 
 /* returns 1 if they are the same mac addr */
-static int compare_gtt(struct hlist_node *node, void *data2)
+static int compare_gtt(const struct hlist_node *node, const void *data2)
 {
-	void *data1 = container_of(node, struct tt_global_entry, hash_entry);
+	const void *data1 = container_of(node, struct tt_global_entry,
+					 hash_entry);
 
 	return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0);
 }
@@ -54,7 +56,7 @@ static void tt_local_start_timer(struct bat_priv *bat_priv)
 }
 
 static struct tt_local_entry *tt_local_hash_find(struct bat_priv *bat_priv,
-						   void *data)
+						 const void *data)
 {
 	struct hashtable_t *hash = bat_priv->tt_local_hash;
 	struct hlist_head *head;
@@ -82,7 +84,7 @@ static struct tt_local_entry *tt_local_hash_find(struct bat_priv *bat_priv,
 }
 
 static struct tt_global_entry *tt_global_hash_find(struct bat_priv *bat_priv,
-						     void *data)
+						   const void *data)
 {
 	struct hashtable_t *hash = bat_priv->tt_global_hash;
 	struct hlist_head *head;
@@ -126,7 +128,7 @@ int tt_local_init(struct bat_priv *bat_priv)
 	return 1;
 }
 
-void tt_local_add(struct net_device *soft_iface, uint8_t *addr)
+void tt_local_add(struct net_device *soft_iface, const uint8_t *addr)
 {
 	struct bat_priv *bat_priv = netdev_priv(soft_iface);
 	struct tt_local_entry *tt_local_entry;
@@ -162,7 +164,7 @@ void tt_local_add(struct net_device *soft_iface, uint8_t *addr)
 	bat_dbg(DBG_ROUTES, bat_priv,
 		"Creating new local tt entry: %pM\n", addr);
 
-	tt_local_entry = kmalloc(sizeof(struct tt_local_entry), GFP_ATOMIC);
+	tt_local_entry = kmalloc(sizeof(*tt_local_entry), GFP_ATOMIC);
 	if (!tt_local_entry)
 		return;
 
@@ -311,7 +313,7 @@ out:
 
 static void _tt_local_del(struct hlist_node *node, void *arg)
 {
-	struct bat_priv *bat_priv = (struct bat_priv *)arg;
+	struct bat_priv *bat_priv = arg;
 	void *data = container_of(node, struct tt_local_entry, hash_entry);
 
 	kfree(data);
@@ -320,8 +322,8 @@ static void _tt_local_del(struct hlist_node *node, void *arg)
 }
 
 static void tt_local_del(struct bat_priv *bat_priv,
-			  struct tt_local_entry *tt_local_entry,
-			  char *message)
+			 struct tt_local_entry *tt_local_entry,
+			 const char *message)
 {
 	bat_dbg(DBG_ROUTES, bat_priv, "Deleting local tt entry (%pM): %s\n",
 		tt_local_entry->addr, message);
@@ -332,7 +334,7 @@ static void tt_local_del(struct bat_priv *bat_priv,
 }
 
 void tt_local_remove(struct bat_priv *bat_priv,
-		      uint8_t *addr, char *message)
+		     const uint8_t *addr, const char *message)
 {
 	struct tt_local_entry *tt_local_entry;
 
@@ -409,12 +411,12 @@ int tt_global_init(struct bat_priv *bat_priv)
 
 void tt_global_add_orig(struct bat_priv *bat_priv,
 			 struct orig_node *orig_node,
-			 unsigned char *tt_buff, int tt_buff_len)
+			 const unsigned char *tt_buff, int tt_buff_len)
 {
 	struct tt_global_entry *tt_global_entry;
 	struct tt_local_entry *tt_local_entry;
 	int tt_buff_count = 0;
-	unsigned char *tt_ptr;
+	const unsigned char *tt_ptr;
 
 	while ((tt_buff_count + 1) * ETH_ALEN <= tt_buff_len) {
 		spin_lock_bh(&bat_priv->tt_ghash_lock);
@@ -425,9 +427,8 @@ void tt_global_add_orig(struct bat_priv *bat_priv,
 		if (!tt_global_entry) {
 			spin_unlock_bh(&bat_priv->tt_ghash_lock);
 
-			tt_global_entry =
-				kmalloc(sizeof(struct tt_global_entry),
-					GFP_ATOMIC);
+			tt_global_entry = kmalloc(sizeof(*tt_global_entry),
+						  GFP_ATOMIC);
 
 			if (!tt_global_entry)
 				break;
@@ -557,7 +558,7 @@ out:
 
 static void _tt_global_del_orig(struct bat_priv *bat_priv,
 				 struct tt_global_entry *tt_global_entry,
-				 char *message)
+				 const char *message)
 {
 	bat_dbg(DBG_ROUTES, bat_priv,
 		"Deleting global tt entry %pM (via %pM): %s\n",
@@ -570,7 +571,7 @@ static void _tt_global_del_orig(struct bat_priv *bat_priv,
 }
 
 void tt_global_del_orig(struct bat_priv *bat_priv,
-			 struct orig_node *orig_node, char *message)
+			 struct orig_node *orig_node, const char *message)
 {
 	struct tt_global_entry *tt_global_entry;
 	int tt_buff_count = 0;
@@ -616,7 +617,8 @@ void tt_global_free(struct bat_priv *bat_priv)
 	bat_priv->tt_global_hash = NULL;
 }
 
-struct orig_node *transtable_search(struct bat_priv *bat_priv, uint8_t *addr)
+struct orig_node *transtable_search(struct bat_priv *bat_priv,
+				    const uint8_t *addr)
 {
 	struct tt_global_entry *tt_global_entry;
 	struct orig_node *orig_node = NULL;
diff --git a/net/batman-adv/translation-table.h b/net/batman-adv/translation-table.h
index 46152c3..0f2b990 100644
--- a/net/batman-adv/translation-table.h
+++ b/net/batman-adv/translation-table.h
@@ -23,21 +23,22 @@
 #define _NET_BATMAN_ADV_TRANSLATION_TABLE_H_
 
 int tt_local_init(struct bat_priv *bat_priv);
-void tt_local_add(struct net_device *soft_iface, uint8_t *addr);
+void tt_local_add(struct net_device *soft_iface, const uint8_t *addr);
 void tt_local_remove(struct bat_priv *bat_priv,
-		      uint8_t *addr, char *message);
+		     const uint8_t *addr, const char *message);
 int tt_local_fill_buffer(struct bat_priv *bat_priv,
 			  unsigned char *buff, int buff_len);
 int tt_local_seq_print_text(struct seq_file *seq, void *offset);
 void tt_local_free(struct bat_priv *bat_priv);
 int tt_global_init(struct bat_priv *bat_priv);
 void tt_global_add_orig(struct bat_priv *bat_priv,
-			 struct orig_node *orig_node,
-			 unsigned char *tt_buff, int tt_buff_len);
+			struct orig_node *orig_node,
+			const unsigned char *tt_buff, int tt_buff_len);
 int tt_global_seq_print_text(struct seq_file *seq, void *offset);
 void tt_global_del_orig(struct bat_priv *bat_priv,
-			 struct orig_node *orig_node, char *message);
+			 struct orig_node *orig_node, const char *message);
 void tt_global_free(struct bat_priv *bat_priv);
-struct orig_node *transtable_search(struct bat_priv *bat_priv, uint8_t *addr);
+struct orig_node *transtable_search(struct bat_priv *bat_priv,
+				    const uint8_t *addr);
 
 #endif /* _NET_BATMAN_ADV_TRANSLATION_TABLE_H_ */
diff --git a/net/batman-adv/types.h b/net/batman-adv/types.h
index fab70e8..65b3222 100644
--- a/net/batman-adv/types.h
+++ b/net/batman-adv/types.h
@@ -246,10 +246,10 @@ struct frag_packet_list_entry {
 };
 
 struct vis_info {
-	unsigned long       first_seen;
-	struct list_head    recv_list;
-			    /* list of server-neighbors we received a vis-packet
-			     * from.  we should not reply to them. */
+	unsigned long first_seen;
+	/* list of server-neighbors we received a vis-packet
+	 * from.  we should not reply to them. */
+	struct list_head recv_list;
 	struct list_head send_list;
 	struct kref refcount;
 	struct hlist_node hash_entry;
diff --git a/net/batman-adv/unicast.c b/net/batman-adv/unicast.c
index 19c3daf..6eabf42 100644
--- a/net/batman-adv/unicast.c
+++ b/net/batman-adv/unicast.c
@@ -39,8 +39,8 @@ static struct sk_buff *frag_merge_packet(struct list_head *head,
 		(struct unicast_frag_packet *)skb->data;
 	struct sk_buff *tmp_skb;
 	struct unicast_packet *unicast_packet;
-	int hdr_len = sizeof(struct unicast_packet);
-	int uni_diff = sizeof(struct unicast_frag_packet) - hdr_len;
+	int hdr_len = sizeof(*unicast_packet);
+	int uni_diff = sizeof(*up) - hdr_len;
 
 	/* set skb to the first part and tmp_skb to the second part */
 	if (up->flags & UNI_FRAG_HEAD) {
@@ -53,7 +53,7 @@ static struct sk_buff *frag_merge_packet(struct list_head *head,
 	if (skb_linearize(skb) < 0 || skb_linearize(tmp_skb) < 0)
 		goto err;
 
-	skb_pull(tmp_skb, sizeof(struct unicast_frag_packet));
+	skb_pull(tmp_skb, sizeof(*up));
 	if (pskb_expand_head(skb, 0, tmp_skb->len, GFP_ATOMIC) < 0)
 		goto err;
 
@@ -99,8 +99,7 @@ static int frag_create_buffer(struct list_head *head)
 	struct frag_packet_list_entry *tfp;
 
 	for (i = 0; i < FRAG_BUFFER_SIZE; i++) {
-		tfp = kmalloc(sizeof(struct frag_packet_list_entry),
-			GFP_ATOMIC);
+		tfp = kmalloc(sizeof(*tfp), GFP_ATOMIC);
 		if (!tfp) {
 			frag_list_free(head);
 			return -ENOMEM;
@@ -115,7 +114,7 @@ static int frag_create_buffer(struct list_head *head)
 }
 
 static struct frag_packet_list_entry *frag_search_packet(struct list_head *head,
-						 struct unicast_frag_packet *up)
+					   const struct unicast_frag_packet *up)
 {
 	struct frag_packet_list_entry *tfp;
 	struct unicast_frag_packet *tmp_up = NULL;
@@ -218,14 +217,14 @@ out:
 }
 
 int frag_send_skb(struct sk_buff *skb, struct bat_priv *bat_priv,
-		  struct hard_iface *hard_iface, uint8_t dstaddr[])
+		  struct hard_iface *hard_iface, const uint8_t dstaddr[])
 {
 	struct unicast_packet tmp_uc, *unicast_packet;
 	struct hard_iface *primary_if;
 	struct sk_buff *frag_skb;
 	struct unicast_frag_packet *frag1, *frag2;
-	int uc_hdr_len = sizeof(struct unicast_packet);
-	int ucf_hdr_len = sizeof(struct unicast_frag_packet);
+	int uc_hdr_len = sizeof(*unicast_packet);
+	int ucf_hdr_len = sizeof(*frag1);
 	int data_len = skb->len - uc_hdr_len;
 	int large_tail = 0, ret = NET_RX_DROP;
 	uint16_t seqno;
@@ -250,14 +249,14 @@ int frag_send_skb(struct sk_buff *skb, struct bat_priv *bat_priv,
 	frag1 = (struct unicast_frag_packet *)skb->data;
 	frag2 = (struct unicast_frag_packet *)frag_skb->data;
 
-	memcpy(frag1, &tmp_uc, sizeof(struct unicast_packet));
+	memcpy(frag1, &tmp_uc, sizeof(tmp_uc));
 
 	frag1->ttl--;
 	frag1->version = COMPAT_VERSION;
 	frag1->packet_type = BAT_UNICAST_FRAG;
 
 	memcpy(frag1->orig, primary_if->net_dev->dev_addr, ETH_ALEN);
-	memcpy(frag2, frag1, sizeof(struct unicast_frag_packet));
+	memcpy(frag2, frag1, sizeof(*frag2));
 
 	if (data_len & 1)
 		large_tail = UNI_FRAG_LARGETAIL;
@@ -295,7 +294,7 @@ int unicast_send_skb(struct sk_buff *skb, struct bat_priv *bat_priv)
 
 	/* get routing information */
 	if (is_multicast_ether_addr(ethhdr->h_dest)) {
-		orig_node = (struct orig_node *)gw_get_selected_orig(bat_priv);
+		orig_node = gw_get_selected_orig(bat_priv);
 		if (orig_node)
 			goto find_router;
 	}
@@ -314,10 +313,7 @@ find_router:
 	if (!neigh_node)
 		goto out;
 
-	if (neigh_node->if_incoming->if_status != IF_ACTIVE)
-		goto out;
-
-	if (my_skb_head_push(skb, sizeof(struct unicast_packet)) < 0)
+	if (my_skb_head_push(skb, sizeof(*unicast_packet)) < 0)
 		goto out;
 
 	unicast_packet = (struct unicast_packet *)skb->data;
@@ -331,7 +327,7 @@ find_router:
 	memcpy(unicast_packet->dest, orig_node->orig, ETH_ALEN);
 
 	if (atomic_read(&bat_priv->fragmentation) &&
-	    data_len + sizeof(struct unicast_packet) >
+	    data_len + sizeof(*unicast_packet) >
 				neigh_node->if_incoming->net_dev->mtu) {
 		/* send frag skb decreases ttl */
 		unicast_packet->ttl++;
diff --git a/net/batman-adv/unicast.h b/net/batman-adv/unicast.h
index 16ad7a9..62f54b9 100644
--- a/net/batman-adv/unicast.h
+++ b/net/batman-adv/unicast.h
@@ -32,11 +32,11 @@ int frag_reassemble_skb(struct sk_buff *skb, struct bat_priv *bat_priv,
 void frag_list_free(struct list_head *head);
 int unicast_send_skb(struct sk_buff *skb, struct bat_priv *bat_priv);
 int frag_send_skb(struct sk_buff *skb, struct bat_priv *bat_priv,
-		  struct hard_iface *hard_iface, uint8_t dstaddr[]);
+		  struct hard_iface *hard_iface, const uint8_t dstaddr[]);
 
-static inline int frag_can_reassemble(struct sk_buff *skb, int mtu)
+static inline int frag_can_reassemble(const struct sk_buff *skb, int mtu)
 {
-	struct unicast_frag_packet *unicast_packet;
+	const struct unicast_frag_packet *unicast_packet;
 	int uneven_correction = 0;
 	unsigned int merged_size;
 
@@ -49,7 +49,7 @@ static inline int frag_can_reassemble(struct sk_buff *skb, int mtu)
 			uneven_correction = -1;
 	}
 
-	merged_size = (skb->len - sizeof(struct unicast_frag_packet)) * 2;
+	merged_size = (skb->len - sizeof(*unicast_packet)) * 2;
 	merged_size += sizeof(struct unicast_packet) + uneven_correction;
 
 	return merged_size <= mtu;
diff --git a/net/batman-adv/vis.c b/net/batman-adv/vis.c
index c39f20c..355c6e5 100644
--- a/net/batman-adv/vis.c
+++ b/net/batman-adv/vis.c
@@ -30,22 +30,6 @@
 
 #define MAX_VIS_PACKET_SIZE 1000
 
-/* Returns the smallest signed integer in two's complement with the sizeof x */
-#define smallest_signed_int(x) (1u << (7u + 8u * (sizeof(x) - 1u)))
-
-/* Checks if a sequence number x is a predecessor/successor of y.
- * they handle overflows/underflows and can correctly check for a
- * predecessor/successor unless the variable sequence number has grown by
- * more then 2**(bitwidth(x)-1)-1.
- * This means that for a uint8_t with the maximum value 255, it would think:
- *  - when adding nothing - it is neither a predecessor nor a successor
- *  - before adding more than 127 to the starting value - it is a predecessor,
- *  - when adding 128 - it is neither a predecessor nor a successor,
- *  - after adding more than 127 to the starting value - it is a successor */
-#define seq_before(x, y) ({typeof(x) _dummy = (x - y); \
-			_dummy > smallest_signed_int(_dummy); })
-#define seq_after(x, y) seq_before(y, x)
-
 static void start_vis_timer(struct bat_priv *bat_priv);
 
 /* free the info */
@@ -68,10 +52,10 @@ static void free_info(struct kref *ref)
 }
 
 /* Compare two vis packets, used by the hashing algorithm */
-static int vis_info_cmp(struct hlist_node *node, void *data2)
+static int vis_info_cmp(const struct hlist_node *node, const void *data2)
 {
-	struct vis_info *d1, *d2;
-	struct vis_packet *p1, *p2;
+	const struct vis_info *d1, *d2;
+	const struct vis_packet *p1, *p2;
 
 	d1 = container_of(node, struct vis_info, hash_entry);
 	d2 = data2;
@@ -82,11 +66,11 @@ static int vis_info_cmp(struct hlist_node *node, void *data2)
 
 /* hash function to choose an entry in a hash table of given size */
 /* hash algorithm from http://en.wikipedia.org/wiki/Hash_table */
-static int vis_info_choose(void *data, int size)
+static int vis_info_choose(const void *data, int size)
 {
-	struct vis_info *vis_info = data;
-	struct vis_packet *packet;
-	unsigned char *key;
+	const struct vis_info *vis_info = data;
+	const struct vis_packet *packet;
+	const unsigned char *key;
 	uint32_t hash = 0;
 	size_t i;
 
@@ -106,7 +90,7 @@ static int vis_info_choose(void *data, int size)
 }
 
 static struct vis_info *vis_hash_find(struct bat_priv *bat_priv,
-				      void *data)
+				      const void *data)
 {
 	struct hashtable_t *hash = bat_priv->vis_hash;
 	struct hlist_head *head;
@@ -143,7 +127,7 @@ static void vis_data_insert_interface(const uint8_t *interface,
 	struct hlist_node *pos;
 
 	hlist_for_each_entry(entry, pos, if_list, list) {
-		if (compare_eth(entry->addr, (void *)interface))
+		if (compare_eth(entry->addr, interface))
 			return;
 	}
 
@@ -156,7 +140,8 @@ static void vis_data_insert_interface(const uint8_t *interface,
 	hlist_add_head(&entry->list, if_list);
 }
 
-static ssize_t vis_data_read_prim_sec(char *buff, struct hlist_head *if_list)
+static ssize_t vis_data_read_prim_sec(char *buff,
+				      const struct hlist_head *if_list)
 {
 	struct if_list_entry *entry;
 	struct hlist_node *pos;
@@ -189,8 +174,9 @@ static size_t vis_data_count_prim_sec(struct hlist_head *if_list)
 }
 
 /* read an entry  */
-static ssize_t vis_data_read_entry(char *buff, struct vis_info_entry *entry,
-				   uint8_t *src, bool primary)
+static ssize_t vis_data_read_entry(char *buff,
+				   const struct vis_info_entry *entry,
+				   const uint8_t *src, bool primary)
 {
 	/* maximal length: max(4+17+2, 3+17+1+3+2) == 26 */
 	if (primary && entry->quality == 0)
@@ -239,7 +225,7 @@ int vis_seq_print_text(struct seq_file *seq, void *offset)
 		hlist_for_each_entry_rcu(info, node, head, hash_entry) {
 			packet = (struct vis_packet *)info->skb_packet->data;
 			entries = (struct vis_info_entry *)
-				((char *)packet + sizeof(struct vis_packet));
+				((char *)packet + sizeof(*packet));
 
 			for (j = 0; j < packet->entries; j++) {
 				if (entries[j].quality == 0)
@@ -287,7 +273,7 @@ int vis_seq_print_text(struct seq_file *seq, void *offset)
 		hlist_for_each_entry_rcu(info, node, head, hash_entry) {
 			packet = (struct vis_packet *)info->skb_packet->data;
 			entries = (struct vis_info_entry *)
-				((char *)packet + sizeof(struct vis_packet));
+				((char *)packet + sizeof(*packet));
 
 			for (j = 0; j < packet->entries; j++) {
 				if (entries[j].quality == 0)
@@ -361,11 +347,11 @@ static void send_list_del(struct vis_info *info)
 
 /* tries to add one entry to the receive list. */
 static void recv_list_add(struct bat_priv *bat_priv,
-			  struct list_head *recv_list, char *mac)
+			  struct list_head *recv_list, const char *mac)
 {
 	struct recvlist_node *entry;
 
-	entry = kmalloc(sizeof(struct recvlist_node), GFP_ATOMIC);
+	entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
 	if (!entry)
 		return;
 
@@ -377,9 +363,9 @@ static void recv_list_add(struct bat_priv *bat_priv,
 
 /* returns 1 if this mac is in the recv_list */
 static int recv_list_is_in(struct bat_priv *bat_priv,
-			   struct list_head *recv_list, char *mac)
+			   const struct list_head *recv_list, const char *mac)
 {
-	struct recvlist_node *entry;
+	const struct recvlist_node *entry;
 
 	spin_lock_bh(&bat_priv->vis_list_lock);
 	list_for_each_entry(entry, recv_list, list) {
@@ -412,11 +398,11 @@ static struct vis_info *add_packet(struct bat_priv *bat_priv,
 		return NULL;
 
 	/* see if the packet is already in vis_hash */
-	search_elem.skb_packet = dev_alloc_skb(sizeof(struct vis_packet));
+	search_elem.skb_packet = dev_alloc_skb(sizeof(*search_packet));
 	if (!search_elem.skb_packet)
 		return NULL;
 	search_packet = (struct vis_packet *)skb_put(search_elem.skb_packet,
-						     sizeof(struct vis_packet));
+						     sizeof(*search_packet));
 
 	memcpy(search_packet->vis_orig, vis_packet->vis_orig, ETH_ALEN);
 	old_info = vis_hash_find(bat_priv, &search_elem);
@@ -442,27 +428,26 @@ static struct vis_info *add_packet(struct bat_priv *bat_priv,
 		kref_put(&old_info->refcount, free_info);
 	}
 
-	info = kmalloc(sizeof(struct vis_info), GFP_ATOMIC);
+	info = kmalloc(sizeof(*info), GFP_ATOMIC);
 	if (!info)
 		return NULL;
 
-	info->skb_packet = dev_alloc_skb(sizeof(struct vis_packet) +
-					 vis_info_len + sizeof(struct ethhdr));
+	info->skb_packet = dev_alloc_skb(sizeof(*packet) + vis_info_len +
+					 sizeof(struct ethhdr));
 	if (!info->skb_packet) {
 		kfree(info);
 		return NULL;
 	}
 	skb_reserve(info->skb_packet, sizeof(struct ethhdr));
-	packet = (struct vis_packet *)skb_put(info->skb_packet,
-					      sizeof(struct vis_packet) +
-					      vis_info_len);
+	packet = (struct vis_packet *)skb_put(info->skb_packet, sizeof(*packet)
+					      + vis_info_len);
 
 	kref_init(&info->refcount);
 	INIT_LIST_HEAD(&info->send_list);
 	INIT_LIST_HEAD(&info->recv_list);
 	info->first_seen = jiffies;
 	info->bat_priv = bat_priv;
-	memcpy(packet, vis_packet, sizeof(struct vis_packet) + vis_info_len);
+	memcpy(packet, vis_packet, sizeof(*packet) + vis_info_len);
 
 	/* initialize and add new packet. */
 	*is_new = 1;
@@ -599,9 +584,9 @@ static int find_best_vis_server(struct bat_priv *bat_priv,
 }
 
 /* Return true if the vis packet is full. */
-static bool vis_packet_full(struct vis_info *info)
+static bool vis_packet_full(const struct vis_info *info)
 {
-	struct vis_packet *packet;
+	const struct vis_packet *packet;
 	packet = (struct vis_packet *)info->skb_packet->data;
 
 	if (MAX_VIS_PACKET_SIZE / sizeof(struct vis_info_entry)
@@ -619,7 +604,7 @@ static int generate_vis_packet(struct bat_priv *bat_priv)
 	struct hlist_head *head;
 	struct orig_node *orig_node;
 	struct neigh_node *router;
-	struct vis_info *info = (struct vis_info *)bat_priv->my_vis_info;
+	struct vis_info *info = bat_priv->my_vis_info;
 	struct vis_packet *packet = (struct vis_packet *)info->skb_packet->data;
 	struct vis_info_entry *entry;
 	struct tt_local_entry *tt_local_entry;
@@ -632,7 +617,7 @@ static int generate_vis_packet(struct bat_priv *bat_priv)
 	packet->ttl = TTL;
 	packet->seqno = htonl(ntohl(packet->seqno) + 1);
 	packet->entries = 0;
-	skb_trim(info->skb_packet, sizeof(struct vis_packet));
+	skb_trim(info->skb_packet, sizeof(*packet));
 
 	if (packet->vis_type == VIS_TYPE_CLIENT_UPDATE) {
 		best_tq = find_best_vis_server(bat_priv, info);
@@ -908,17 +893,15 @@ int vis_init(struct bat_priv *bat_priv)
 		goto err;
 	}
 
-	bat_priv->my_vis_info->skb_packet = dev_alloc_skb(
-						sizeof(struct vis_packet) +
-						MAX_VIS_PACKET_SIZE +
-						sizeof(struct ethhdr));
+	bat_priv->my_vis_info->skb_packet = dev_alloc_skb(sizeof(*packet) +
+							  MAX_VIS_PACKET_SIZE +
+							 sizeof(struct ethhdr));
 	if (!bat_priv->my_vis_info->skb_packet)
 		goto free_info;
 
 	skb_reserve(bat_priv->my_vis_info->skb_packet, sizeof(struct ethhdr));
-	packet = (struct vis_packet *)skb_put(
-					bat_priv->my_vis_info->skb_packet,
-					sizeof(struct vis_packet));
+	packet = (struct vis_packet *)skb_put(bat_priv->my_vis_info->skb_packet,
+					      sizeof(*packet));
 
 	/* prefill the vis info */
 	bat_priv->my_vis_info->first_seen = jiffies -