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authorPatrick McHardy <kaber@trash.net>2008-04-23 22:10:48 -0700
committerDavid S. Miller <davem@davemloft.net>2008-04-23 22:10:48 -0700
commitc9c1014b2bd014c7ec037bbb6f58818162fdb265 (patch)
treedeace0019cbe1600d94e0de85791faa5eb14358e
parent6440be177f56e0b52dd81df82b78875d9a07d5f9 (diff)
[RTNETLINK]: Fix bogus ASSERT_RTNL warning
ASSERT_RTNL uses mutex_trylock to test whether the rtnl_mutex is held. This bogus warnings when running in atomic context, which f.e. happens when adding secondary unicast addresses through macvlan or vlan or when synchronizing multicast addresses from wireless devices. Mid-term we might want to consider moving all address updates to process context since the locking seems overly complicated, for now just fix the bogus warning by changing ASSERT_RTNL to use mutex_is_locked(). Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--include/linux/rtnetlink.h4
-rw-r--r--net/core/rtnetlink.c6
2 files changed, 8 insertions, 2 deletions
diff --git a/include/linux/rtnetlink.h b/include/linux/rtnetlink.h
index b9e17407900..44c81c74453 100644
--- a/include/linux/rtnetlink.h
+++ b/include/linux/rtnetlink.h
@@ -740,13 +740,13 @@ extern void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change);
extern void rtnl_lock(void);
extern void rtnl_unlock(void);
extern int rtnl_trylock(void);
+extern int rtnl_is_locked(void);
extern void rtnetlink_init(void);
extern void __rtnl_unlock(void);
#define ASSERT_RTNL() do { \
- if (unlikely(rtnl_trylock())) { \
- rtnl_unlock(); \
+ if (unlikely(!rtnl_is_locked())) { \
printk(KERN_ERR "RTNL: assertion failed at %s (%d)\n", \
__FILE__, __LINE__); \
dump_stack(); \
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index bc39e417694..cf857c4dc7b 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -82,6 +82,11 @@ int rtnl_trylock(void)
return mutex_trylock(&rtnl_mutex);
}
+int rtnl_is_locked(void)
+{
+ return mutex_is_locked(&rtnl_mutex);
+}
+
static struct rtnl_link *rtnl_msg_handlers[NPROTO];
static inline int rtm_msgindex(int msgtype)
@@ -1402,6 +1407,7 @@ EXPORT_SYMBOL(rtnetlink_put_metrics);
EXPORT_SYMBOL(rtnl_lock);
EXPORT_SYMBOL(rtnl_trylock);
EXPORT_SYMBOL(rtnl_unlock);
+EXPORT_SYMBOL(rtnl_is_locked);
EXPORT_SYMBOL(rtnl_unicast);
EXPORT_SYMBOL(rtnl_notify);
EXPORT_SYMBOL(rtnl_set_sk_err);