From f408e0ce40270559ef80f231843c93baa9947bc5 Mon Sep 17 00:00:00 2001 From: James Chapman Date: Fri, 2 Apr 2010 06:19:05 +0000 Subject: [PATCH] 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 Reviewed-by: Randy Dunlap Signed-off-by: David S. Miller --- include/linux/genetlink.h | 8 ++++++++ net/netlink/genetlink.c | 6 ++++-- 2 files changed, 12 insertions(+), 2 deletions(-) diff --git a/include/linux/genetlink.h b/include/linux/genetlink.h index b834ef6..61549b2 100644 --- a/include/linux/genetlink.h +++ b/include/linux/genetlink.h @@ -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 */ diff --git a/net/netlink/genetlink.c b/net/netlink/genetlink.c index a4b6e14..a28fda7 100644 --- a/net/netlink/genetlink.c +++ b/net/netlink/genetlink.c @@ -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) -- 1.8.2.3