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netlink: Export genl_lock() API for use by modules 

This lets kernel modules which use genl netlink APIs serialize netlink
processing.

Signed-off-by: James Chapman <jchapman@katalix.com>
Reviewed-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
James Chapman 2010-04-02 06:19:05 +00:00 committed by David S. Miller
parent 0d76751fad
commit f408e0ce40
2 changed files with 12 additions and 2 deletions
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8
include/linux/genetlink.h
View File

@ -80,4 +80,12 @@ enum {
#define CTRL_ATTR_MCAST_GRP_MAX (__CTRL_ATTR_MCAST_GRP_MAX - 1)
#ifdef __KERNEL__
/* All generic netlink requests are serialized by a global lock. */
extern void genl_lock(void);
extern void genl_unlock(void);
#endif /* __KERNEL__ */
#endif /* __LINUX_GENERIC_NETLINK_H */

6
net/netlink/genetlink.c
View File

@ -20,15 +20,17 @@
static DEFINE_MUTEX(genl_mutex); /* serialization of message processing */
static inline void genl_lock(void)
void genl_lock(void)
{
mutex_lock(&genl_mutex);
}
EXPORT_SYMBOL(genl_lock);
static inline void genl_unlock(void)
void genl_unlock(void)
{
mutex_unlock(&genl_mutex);
}
EXPORT_SYMBOL(genl_unlock);
#define GENL_FAM_TAB_SIZE 16
#define GENL_FAM_TAB_MASK (GENL_FAM_TAB_SIZE - 1)