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Commit f408e0ce authored by James Chapman's avatar James Chapman Committed by David S. Miller
Browse files

netlink: Export genl_lock() API for use by modules 



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

Signed-off-by: default avatarJames Chapman <jchapman@katalix.com>
Reviewed-by: default avatarRandy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 0d76751f

include/linux/genetlink.h

+8 −0
Original line number Original line Diff line number Diff line
@@ -80,4 +80,12 @@ enum { 




#define CTRL_ATTR_MCAST_GRP_MAX (__CTRL_ATTR_MCAST_GRP_MAX - 1)

#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 */
 
#endif	/* __LINUX_GENERIC_NETLINK_H */

net/netlink/genetlink.c

+4 −2
Original line number Original line Diff line number Diff line
@@ -20,15 +20,17 @@ 




static DEFINE_MUTEX(genl_mutex); /* serialization of message processing */

static DEFINE_MUTEX(genl_mutex); /* serialization of message processing */





static inline void genl_lock(void)

void genl_lock(void)

{

{

	mutex_lock(&genl_mutex);

	mutex_lock(&genl_mutex);

}

}

EXPORT_SYMBOL(genl_lock);





static inline void genl_unlock(void)

void genl_unlock(void)

{

{

	mutex_unlock(&genl_mutex);

	mutex_unlock(&genl_mutex);

}

}

EXPORT_SYMBOL(genl_unlock);





#define GENL_FAM_TAB_SIZE	16

#define GENL_FAM_TAB_SIZE	16

#define GENL_FAM_TAB_MASK	(GENL_FAM_TAB_SIZE - 1)

#define GENL_FAM_TAB_MASK	(GENL_FAM_TAB_SIZE - 1)