[NET]: Add some acquires/releases sparse annotations.

Add __acquires() and __releases() annotations to suppress some sparse
warnings.

example of warnings :

net/ipv4/udp.c:1555:14: warning: context imbalance in 'udp_seq_start' - wrong
count at exit
net/ipv4/udp.c:1571:13: warning: context imbalance in 'udp_seq_stop' -
unexpected unlock

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

5 files changed, 9 insertions, 0 deletions

diff --git a/net/core/dev.c b/net/core/dev.c
index 7153e94..eee7742 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2368,6 +2368,7 @@ static int dev_ifconf(struct net *net, char __user *arg)
  *	in detail.
  */
 void *dev_seq_start(struct seq_file *seq, loff_t *pos)
+	__acquires(dev_base_lock)
 {
 	struct net *net = seq_file_net(seq);
 	loff_t off;
@@ -2394,6 +2395,7 @@ void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 }
 
 void dev_seq_stop(struct seq_file *seq, void *v)
+	__releases(dev_base_lock)
 {
 	read_unlock(&dev_base_lock);
 }
diff --git a/net/core/dev_mcast.c b/net/core/dev_mcast.c
index 63f0b33..cadbfbf 100644
--- a/net/core/dev_mcast.c
+++ b/net/core/dev_mcast.c
@@ -186,6 +186,7 @@ EXPORT_SYMBOL(dev_mc_unsync);
 
 #ifdef CONFIG_PROC_FS
 static void *dev_mc_seq_start(struct seq_file *seq, loff_t *pos)
+	__acquires(dev_base_lock)
 {
 	struct net *net = seq_file_net(seq);
 	struct net_device *dev;
@@ -206,6 +207,7 @@ static void *dev_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 }
 
 static void dev_mc_seq_stop(struct seq_file *seq, void *v)
+	__releases(dev_base_lock)
 {
 	read_unlock(&dev_base_lock);
 }
diff --git a/net/core/gen_stats.c b/net/core/gen_stats.c
index bcc2559..8073561 100644
--- a/net/core/gen_stats.c
+++ b/net/core/gen_stats.c
@@ -55,6 +55,7 @@ rtattr_failure:
 int
 gnet_stats_start_copy_compat(struct sk_buff *skb, int type, int tc_stats_type,
 	int xstats_type, spinlock_t *lock, struct gnet_dump *d)
+	__acquires(lock)
 {
 	memset(d, 0, sizeof(*d));
 
diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index bd899d5..8024933 100644
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -2313,6 +2313,7 @@ static void *neigh_get_idx_any(struct seq_file *seq, loff_t *pos)
 }
 
 void *neigh_seq_start(struct seq_file *seq, loff_t *pos, struct neigh_table *tbl, unsigned int neigh_seq_flags)
+	__acquires(tbl->lock)
 {
 	struct neigh_seq_state *state = seq->private;
 	loff_t pos_minus_one;
@@ -2356,6 +2357,7 @@ out:
 EXPORT_SYMBOL(neigh_seq_next);
 
 void neigh_seq_stop(struct seq_file *seq, void *v)
+	__releases(tbl->lock)
 {
 	struct neigh_seq_state *state = seq->private;
 	struct neigh_table *tbl = state->tbl;
diff --git a/net/core/sock.c b/net/core/sock.c
index 3804e7d..3d7757e 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -2025,6 +2025,7 @@ EXPORT_SYMBOL(proto_unregister);
 
 #ifdef CONFIG_PROC_FS
 static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
+	__acquires(proto_list_lock)
 {
 	read_lock(&proto_list_lock);
 	return seq_list_start_head(&proto_list, *pos);
@@ -2036,6 +2037,7 @@ static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 }
 
 static void proto_seq_stop(struct seq_file *seq, void *v)
+	__releases(proto_list_lock)
 {
 	read_unlock(&proto_list_lock);
 }