RTNETLINK: Fix bogus ASSERT_RTNL warning

[ Upstream commit: c9c1014b2bd014c7ec037bbb6f58818162fdb265 ]

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/include/linux/rtnetlink.h b/include/linux/rtnetlink.h
index b9e174079002300dee538600e8e6e5585757aed8..44c81c74453816b77208edb22c8d1507f83720f0 100644 (file)
--- 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 2bd9c5f7627dd84b450ec3f105263979adda77e3..0cb27722fd9f66c5aa14171fa8502d7d5e0c9836 100644 (file)
--- 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)
@@ -1389,6 +1394,7 @@ 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);