[PATCH] create a kstrdup library function

This patch creates a new kstrdup library function and changes the "local"
implementations in several places to use this function.

Most of the changes come from the sound and net subsystems.  The sound part
had already been acknowledged by Takashi Iwai and the net part by David S.
Miller.

I left UML alone for now because I would need more time to read the code
carefully before making changes there.

Signed-off-by: Paulo Marques <pmarques@grupopie.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

21 files changed, 75 insertions, 94 deletions

diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c
index ee3c869..200a068 100644
--- a/drivers/md/dm-ioctl.c
+++ b/drivers/md/dm-ioctl.c
@@ -122,14 +122,6 @@ static struct hash_cell *__get_uuid_cell(const char *str)
 /*-----------------------------------------------------------------
  * Inserting, removing and renaming a device.
  *---------------------------------------------------------------*/
-static inline char *kstrdup(const char *str)
-{
-	char *r = kmalloc(strlen(str) + 1, GFP_KERNEL);
-	if (r)
-		strcpy(r, str);
-	return r;
-}
-
 static struct hash_cell *alloc_cell(const char *name, const char *uuid,
 				    struct mapped_device *md)
 {
@@ -139,7 +131,7 @@ static struct hash_cell *alloc_cell(const char *name, const char *uuid,
 	if (!hc)
 		return NULL;
 
-	hc->name = kstrdup(name);
+	hc->name = kstrdup(name, GFP_KERNEL);
 	if (!hc->name) {
 		kfree(hc);
 		return NULL;
@@ -149,7 +141,7 @@ static struct hash_cell *alloc_cell(const char *name, const char *uuid,
 		hc->uuid = NULL;
 
 	else {
-		hc->uuid = kstrdup(uuid);
+		hc->uuid = kstrdup(uuid, GFP_KERNEL);
 		if (!hc->uuid) {
 			kfree(hc->name);
 			kfree(hc);
@@ -273,7 +265,7 @@ static int dm_hash_rename(const char *old, const char *new)
 	/*
 	 * duplicate new.
 	 */
-	new_name = kstrdup(new);
+	new_name = kstrdup(new, GFP_KERNEL);
 	if (!new_name)
 		return -ENOMEM;
 
diff --git a/drivers/parport/probe.c b/drivers/parport/probe.c
index c9496314..6e6f42d 100644
--- a/drivers/parport/probe.c
+++ b/drivers/parport/probe.c
@@ -48,14 +48,6 @@ static void pretty_print(struct parport *port, int device)
 	printk("\n");
 }
 
-static char *strdup(char *str)
-{
-	int n = strlen(str)+1;
-	char *s = kmalloc(n, GFP_KERNEL);
-	if (!s) return NULL;
-	return strcpy(s, str);
-}
-
 static void parse_data(struct parport *port, int device, char *str)
 {
 	char *txt = kmalloc(strlen(str)+1, GFP_KERNEL);
@@ -88,16 +80,16 @@ static void parse_data(struct parport *port, int device, char *str)
 			if (!strcmp(p, "MFG") || !strcmp(p, "MANUFACTURER")) {
 				if (info->mfr)
 					kfree (info->mfr);
-				info->mfr = strdup(sep);
+				info->mfr = kstrdup(sep, GFP_KERNEL);
 			} else if (!strcmp(p, "MDL") || !strcmp(p, "MODEL")) {
 				if (info->model)
 					kfree (info->model);
-				info->model = strdup(sep);
+				info->model = kstrdup(sep, GFP_KERNEL);
 			} else if (!strcmp(p, "CLS") || !strcmp(p, "CLASS")) {
 				int i;
 				if (info->class_name)
 					kfree (info->class_name);
-				info->class_name = strdup(sep);
+				info->class_name = kstrdup(sep, GFP_KERNEL);
 				for (u = sep; *u; u++)
 					*u = toupper(*u);
 				for (i = 0; classes[i].token; i++) {
@@ -112,7 +104,7 @@ static void parse_data(struct parport *port, int device, char *str)
 				   !strcmp(p, "COMMAND SET")) {
 				if (info->cmdset)
 					kfree (info->cmdset);
-				info->cmdset = strdup(sep);
+				info->cmdset = kstrdup(sep, GFP_KERNEL);
 				/* if it speaks printer language, it's
 				   probably a printer */
 				if (strstr(sep, "PJL") || strstr(sep, "PCL"))
@@ -120,7 +112,7 @@ static void parse_data(struct parport *port, int device, char *str)
 			} else if (!strcmp(p, "DES") || !strcmp(p, "DESCRIPTION")) {
 				if (info->description)
 					kfree (info->description);
-				info->description = strdup(sep);
+				info->description = kstrdup(sep, GFP_KERNEL);
 			}
 		}
 	rock_on:
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index d6afd44..d89816a 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -925,10 +925,6 @@ extern int skb_checksum_help(struct sk_buff *skb, int inward);
 extern void		net_enable_timestamp(void);
 extern void		net_disable_timestamp(void);
 
-#ifdef CONFIG_SYSCTL
-extern char *net_sysctl_strdup(const char *s);
-#endif
-
 #endif /* __KERNEL__ */
 
 #endif	/* _LINUX_DEV_H */
diff --git a/include/linux/string.h b/include/linux/string.h
index b9fc594..93994c6 100644
--- a/include/linux/string.h
+++ b/include/linux/string.h
@@ -88,6 +88,8 @@ extern int memcmp(const void *,const void *,__kernel_size_t);
 extern void * memchr(const void *,int,__kernel_size_t);
 #endif
 
+extern char *kstrdup(const char *s, int gfp);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/include/sound/core.h b/include/sound/core.h
index 9117c23..f8c4ef0a 100644
--- a/include/sound/core.h
+++ b/include/sound/core.h
@@ -292,6 +292,7 @@ void *snd_hidden_kcalloc(size_t n, size_t size, int flags);
 void snd_hidden_kfree(const void *obj);
 void *snd_hidden_vmalloc(unsigned long size);
 void snd_hidden_vfree(void *obj);
+char *snd_hidden_kstrdup(const char *s, int flags);
 #define kmalloc(size, flags) snd_hidden_kmalloc(size, flags)
 #define kcalloc(n, size, flags) snd_hidden_kcalloc(n, size, flags)
 #define kfree(obj) snd_hidden_kfree(obj)
@@ -301,6 +302,7 @@ void snd_hidden_vfree(void *obj);
 #define vmalloc_nocheck(size) snd_wrapper_vmalloc(size)
 #define kfree_nocheck(obj) snd_wrapper_kfree(obj)
 #define vfree_nocheck(obj) snd_wrapper_vfree(obj)
+#define kstrdup(s, flags)  snd_hidden_kstrdup(s, flags)
 #else
 #define snd_memory_init() /*NOP*/
 #define snd_memory_done() /*NOP*/
@@ -311,7 +313,6 @@ void snd_hidden_vfree(void *obj);
 #define kfree_nocheck(obj) kfree(obj)
 #define vfree_nocheck(obj) vfree(obj)
 #endif
-char *snd_kmalloc_strdup(const char *string, int flags);
 int copy_to_user_fromio(void __user *dst, const volatile void __iomem *src, size_t count);
 int copy_from_user_toio(volatile void __iomem *dst, const void __user *src, size_t count);
 
diff --git a/mm/slab.c b/mm/slab.c
index 93cbbbb..122d031 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -92,6 +92,7 @@
 #include	<linux/sysctl.h>
 #include	<linux/module.h>
 #include	<linux/rcupdate.h>
+#include	<linux/string.h>
 
 #include	<asm/uaccess.h>
 #include	<asm/cacheflush.h>
@@ -3082,3 +3083,26 @@ unsigned int ksize(const void *objp)
 
 	return size;
 }
+
+
+/*
+ * kstrdup - allocate space for and copy an existing string
+ *
+ * @s: the string to duplicate
+ * @gfp: the GFP mask used in the kmalloc() call when allocating memory
+ */
+char *kstrdup(const char *s, int gfp)
+{
+	size_t len;
+	char *buf;
+
+	if (!s)
+		return NULL;
+
+	len = strlen(s) + 1;
+	buf = kmalloc(len, gfp);
+	if (buf)
+		memcpy(buf, s, len);
+	return buf;
+}
+EXPORT_SYMBOL(kstrdup);
diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index f6bdcad..851eb92 100644
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -32,6 +32,7 @@
 #include <net/sock.h>
 #include <linux/rtnetlink.h>
 #include <linux/random.h>
+#include <linux/string.h>
 
 #define NEIGH_DEBUG 1
 
@@ -2592,7 +2593,7 @@ int neigh_sysctl_register(struct net_device *dev, struct neigh_parms *p,
 		t->neigh_vars[17].extra1 = dev;
 	}
 
-	dev_name = net_sysctl_strdup(dev_name_source);
+	dev_name = kstrdup(dev_name_source, GFP_KERNEL);
 	if (!dev_name) {
 		err = -ENOBUFS;
 		goto free;
diff --git a/net/core/sysctl_net_core.c b/net/core/sysctl_net_core.c
index c8be646c..880a888 100644
--- a/net/core/sysctl_net_core.c
+++ b/net/core/sysctl_net_core.c
@@ -35,19 +35,6 @@ extern int sysctl_somaxconn;
 extern char sysctl_divert_version[];
 #endif /* CONFIG_NET_DIVERT */
 
-/*
- * This strdup() is used for creating copies of network 
- * device names to be handed over to sysctl.
- */
- 
-char *net_sysctl_strdup(const char *s)
-{
-	char *rv = kmalloc(strlen(s)+1, GFP_KERNEL);
-	if (rv)
-		strcpy(rv, s);
-	return rv;
-}
-
 ctl_table core_table[] = {
 #ifdef CONFIG_NET
 	{
@@ -177,6 +164,4 @@ ctl_table core_table[] = {
 	{ .ctl_name = 0 }
 };
 
-EXPORT_SYMBOL(net_sysctl_strdup);
-
 #endif
diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
index 650dcb1..d8a10e3 100644
--- a/net/ipv4/devinet.c
+++ b/net/ipv4/devinet.c
@@ -1471,7 +1471,7 @@ static void devinet_sysctl_register(struct in_device *in_dev,
 	 * by sysctl and we wouldn't want anyone to change it under our feet
 	 * (see SIOCSIFNAME).
 	 */	
-	dev_name = net_sysctl_strdup(dev_name);
+	dev_name = kstrdup(dev_name, GFP_KERNEL);
 	if (!dev_name)
 	    goto free;
 
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 14f5c53..a54d4ef 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -57,6 +57,7 @@
 #endif
 #include <linux/delay.h>
 #include <linux/notifier.h>
+#include <linux/string.h>
 
 #include <net/sock.h>
 #include <net/snmp.h>
@@ -3437,7 +3438,7 @@ static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf
 	 * by sysctl and we wouldn't want anyone to change it under our feet
 	 * (see SIOCSIFNAME).
 	 */	
-	dev_name = net_sysctl_strdup(dev_name);
+	dev_name = kstrdup(dev_name, GFP_KERNEL);
 	if (!dev_name)
 	    goto free;
 
diff --git a/net/sunrpc/svcauth_unix.c b/net/sunrpc/svcauth_unix.c
index 2b99b40..d6baf6f 100644
--- a/net/sunrpc/svcauth_unix.c
+++ b/net/sunrpc/svcauth_unix.c
@@ -8,6 +8,7 @@
 #include <linux/err.h>
 #include <linux/seq_file.h>
 #include <linux/hash.h>
+#include <linux/string.h>
 
 #define RPCDBG_FACILITY	RPCDBG_AUTH
 
@@ -20,14 +21,6 @@
  */
 
 
-static char *strdup(char *s)
-{
-	char *rv = kmalloc(strlen(s)+1, GFP_KERNEL);
-	if (rv)
-		strcpy(rv, s);
-	return rv;
-}
-
 struct unix_domain {
 	struct auth_domain	h;
 	int	addr_changes;
@@ -55,7 +48,7 @@ struct auth_domain *unix_domain_find(char *name)
 	if (new == NULL)
 		return NULL;
 	cache_init(&new->h.h);
-	new->h.name = strdup(name);
+	new->h.name = kstrdup(name, GFP_KERNEL);
 	new->h.flavour = RPC_AUTH_UNIX;
 	new->addr_changes = 0;
 	new->h.h.expiry_time = NEVER;
diff --git a/sound/core/info.c b/sound/core/info.c
index 31faffe..5e122bb 100644
--- a/sound/core/info.c
+++ b/sound/core/info.c
@@ -24,6 +24,7 @@
 #include <linux/vmalloc.h>
 #include <linux/time.h>
 #include <linux/smp_lock.h>
+#include <linux/string.h>
 #include <sound/core.h>
 #include <sound/minors.h>
 #include <sound/info.h>
@@ -754,7 +755,7 @@ static snd_info_entry_t *snd_info_create_entry(const char *name)
 	entry = kcalloc(1, sizeof(*entry), GFP_KERNEL);
 	if (entry == NULL)
 		return NULL;
-	entry->name = snd_kmalloc_strdup(name, GFP_KERNEL);
+	entry->name = kstrdup(name, GFP_KERNEL);
 	if (entry->name == NULL) {
 		kfree(entry);
 		return NULL;
diff --git a/sound/core/info_oss.c b/sound/core/info_oss.c
index f9e4ce4..1210796 100644
--- a/sound/core/info_oss.c
+++ b/sound/core/info_oss.c
@@ -22,6 +22,7 @@
 #include <sound/driver.h>
 #include <linux/slab.h>
 #include <linux/time.h>
+#include <linux/string.h>
 #include <sound/core.h>
 #include <sound/minors.h>
 #include <sound/info.h>
@@ -51,7 +52,7 @@ int snd_oss_info_register(int dev, int num, char *string)
 			x = NULL;
 		}
 	} else {
-		x = snd_kmalloc_strdup(string, GFP_KERNEL);
+		x = kstrdup(string, GFP_KERNEL);
 		if (x == NULL) {
 			up(&strings);
 			return -ENOMEM;
diff --git a/sound/core/memory.c b/sound/core/memory.c
index 20860fe..c1fb28e 100644
--- a/sound/core/memory.c
+++ b/sound/core/memory.c
@@ -184,6 +184,20 @@ void snd_hidden_vfree(void *obj)
 	snd_wrapper_vfree(obj);
 }
 
+char *snd_hidden_kstrdup(const char *s, int flags)
+{
+	int len;
+	char *buf;
+
+	if (!s) return NULL;
+
+	len = strlen(s) + 1;
+	buf = _snd_kmalloc(len, flags);
+	if (buf)
+		memcpy(buf, s, len);
+	return buf;
+}
+
 static void snd_memory_info_read(snd_info_entry_t *entry, snd_info_buffer_t * buffer)
 {
 	snd_iprintf(buffer, "kmalloc: %li bytes\n", snd_alloc_kmalloc);
@@ -214,36 +228,9 @@ int __exit snd_memory_info_done(void)
 	return 0;
 }
 
-#else
-
-#define _snd_kmalloc kmalloc
-
 #endif /* CONFIG_SND_DEBUG_MEMORY */
 
 /**
- * snd_kmalloc_strdup - copy the string
- * @string: the original string
- * @flags: allocation conditions, GFP_XXX
- *
- * Allocates a memory chunk via kmalloc() and copies the string to it.
- *
- * Returns the pointer, or NULL if no enoguh memory.
- */
-char *snd_kmalloc_strdup(const char *string, int flags)
-{
-	size_t len;
-	char *ptr;
-
-	if (!string)
-		return NULL;
-	len = strlen(string) + 1;
-	ptr = _snd_kmalloc(len, flags);
-	if (ptr)
-		memcpy(ptr, string, len);
-	return ptr;
-}
-
-/**
  * copy_to_user_fromio - copy data from mmio-space to user-space
  * @dst: the destination pointer on user-space
  * @src: the source pointer on mmio
diff --git a/sound/core/oss/mixer_oss.c b/sound/core/oss/mixer_oss.c
index 98ed9a9..98fc076 100644
--- a/sound/core/oss/mixer_oss.c
+++ b/sound/core/oss/mixer_oss.c
@@ -24,6 +24,7 @@
 #include <linux/smp_lock.h>
 #include <linux/slab.h>
 #include <linux/time.h>
+#include <linux/string.h>
 #include <sound/core.h>
 #include <sound/minors.h>
 #include <sound/control.h>
@@ -1137,7 +1138,7 @@ static void snd_mixer_oss_proc_write(snd_info_entry_t *entry,
 			goto __unlock;
 		}
 		tbl->oss_id = ch;
-		tbl->name = snd_kmalloc_strdup(str, GFP_KERNEL);
+		tbl->name = kstrdup(str, GFP_KERNEL);
 		if (! tbl->name) {
 			kfree(tbl);
 			goto __unlock;
diff --git a/sound/core/oss/pcm_oss.c b/sound/core/oss/pcm_oss.c
index cab3097..de7444c 100644
--- a/sound/core/oss/pcm_oss.c
+++ b/sound/core/oss/pcm_oss.c
@@ -33,6 +33,7 @@
 #include <linux/time.h>
 #include <linux/vmalloc.h>
 #include <linux/moduleparam.h>
+#include <linux/string.h>
 #include <sound/core.h>
 #include <sound/minors.h>
 #include <sound/pcm.h>
@@ -2360,7 +2361,7 @@ static void snd_pcm_oss_proc_write(snd_info_entry_t *entry,
 					for (setup1 = pstr->oss.setup_list; setup1->next; setup1 = setup1->next);
 					setup1->next = setup;
 				}
-				template.task_name = snd_kmalloc_strdup(task_name, GFP_KERNEL);
+				template.task_name = kstrdup(task_name, GFP_KERNEL);
 			} else {
 				buffer->error = -ENOMEM;
 			}
diff --git a/sound/core/sound.c b/sound/core/sound.c
index 0815fad..7612884 100644
--- a/sound/core/sound.c
+++ b/sound/core/sound.c
@@ -399,8 +399,8 @@ EXPORT_SYMBOL(snd_hidden_kcalloc);
 EXPORT_SYMBOL(snd_hidden_kfree);
 EXPORT_SYMBOL(snd_hidden_vmalloc);
 EXPORT_SYMBOL(snd_hidden_vfree);
+EXPORT_SYMBOL(snd_hidden_kstrdup);
 #endif
-EXPORT_SYMBOL(snd_kmalloc_strdup);
 EXPORT_SYMBOL(copy_to_user_fromio);
 EXPORT_SYMBOL(copy_from_user_toio);
   /* init.c */
diff --git a/sound/core/timer.c b/sound/core/timer.c
index b498e54..cfaccd4 100644
--- a/sound/core/timer.c
+++ b/sound/core/timer.c
@@ -26,6 +26,7 @@
 #include <linux/slab.h>
 #include <linux/time.h>
 #include <linux/moduleparam.h>
+#include <linux/string.h>
 #include <sound/core.h>
 #include <sound/timer.h>
 #include <sound/control.h>
@@ -100,7 +101,7 @@ static snd_timer_instance_t *snd_timer_instance_new(char *owner, snd_timer_t *ti
 	timeri = kcalloc(1, sizeof(*timeri), GFP_KERNEL);
 	if (timeri == NULL)
 		return NULL;
-	timeri->owner = snd_kmalloc_strdup(owner, GFP_KERNEL);
+	timeri->owner = kstrdup(owner, GFP_KERNEL);
 	if (! timeri->owner) {
 		kfree(timeri);
 		return NULL;
diff --git a/sound/isa/gus/gus_mem.c b/sound/isa/gus/gus_mem.c
index 609838e..5eb766d 100644
--- a/sound/isa/gus/gus_mem.c
+++ b/sound/isa/gus/gus_mem.c
@@ -21,6 +21,7 @@
 
 #include <sound/driver.h>
 #include <linux/slab.h>
+#include <linux/string.h>
 #include <sound/core.h>
 #include <sound/gus.h>
 #include <sound/info.h>
@@ -213,7 +214,7 @@ snd_gf1_mem_block_t *snd_gf1_mem_alloc(snd_gf1_mem_t * alloc, int owner,
 	if (share_id != NULL)
 		memcpy(&block.share_id, share_id, sizeof(block.share_id));
 	block.owner = owner;
-	block.name = snd_kmalloc_strdup(name, GFP_KERNEL);
+	block.name = kstrdup(name, GFP_KERNEL);
 	nblock = snd_gf1_mem_xalloc(alloc, &block);
 	snd_gf1_mem_lock(alloc, 1);
 	return nblock;
@@ -253,13 +254,13 @@ int snd_gf1_mem_init(snd_gus_card_t * gus)
 	if (gus->gf1.enh_mode) {
 		block.ptr = 0;
 		block.size = 1024;
-		block.name = snd_kmalloc_strdup("InterWave LFOs", GFP_KERNEL);
+		block.name = kstrdup("InterWave LFOs", GFP_KERNEL);
 		if (snd_gf1_mem_xalloc(alloc, &block) == NULL)
 			return -ENOMEM;
 	}
 	block.ptr = gus->gf1.default_voice_address;
 	block.size = 4;
-	block.name = snd_kmalloc_strdup("Voice default (NULL's)", GFP_KERNEL);
+	block.name = kstrdup("Voice default (NULL's)", GFP_KERNEL);
 	if (snd_gf1_mem_xalloc(alloc, &block) == NULL)
 		return -ENOMEM;
 #ifdef CONFIG_SND_DEBUG
diff --git a/sound/pci/hda/patch_realtek.c b/sound/pci/hda/patch_realtek.c
index 9edd558..bab8984 100644
--- a/sound/pci/hda/patch_realtek.c
+++ b/sound/pci/hda/patch_realtek.c
@@ -1781,7 +1781,7 @@ static int add_control(struct alc_spec *spec, int type, const char *name, unsign
 
 	knew = &spec->kctl_alloc[spec->num_kctl_used];
 	*knew = alc880_control_templates[type];
-	knew->name = snd_kmalloc_strdup(name, GFP_KERNEL);
+	knew->name = kstrdup(name, GFP_KERNEL);
 	if (! knew->name)
 		return -ENOMEM;
 	knew->private_value = val;
diff --git a/sound/synth/emux/emux.c b/sound/synth/emux/emux.c
index 16f3b46..60d0b2c 100644
--- a/sound/synth/emux/emux.c
+++ b/sound/synth/emux/emux.c
@@ -22,6 +22,7 @@
 #include <linux/wait.h>
 #include <linux/sched.h>
 #include <linux/slab.h>
+#include <linux/string.h>
 #include <sound/core.h>
 #include <sound/emux_synth.h>
 #include <linux/init.h>
@@ -76,7 +77,7 @@ int snd_emux_register(snd_emux_t *emu, snd_card_t *card, int index, char *name)
 	snd_assert(name != NULL, return -EINVAL);
 
 	emu->card = card;
-	emu->name = snd_kmalloc_strdup(name, GFP_KERNEL);
+	emu->name = kstrdup(name, GFP_KERNEL);
 	emu->voices = kcalloc(emu->max_voices, sizeof(snd_emux_voice_t), GFP_KERNEL);
 	if (emu->voices == NULL)
 		return -ENOMEM;