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bridge: Fix potential deadlock on br->multicast_lock

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multicast_lock is taken in softirq context, so we should use
spin_lock_bh() in userspace.

call-chain in softirq context:
run_timer_softirq()
	br_multicast_query_expired()

call-chain in userspace:
sysfs_write_file()
	store_multicast_snooping()
		br_multicast_toggle()

Signed-off-by: Andrew Vagin <avagin@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Andrey Vagin 2011-11-10 05:48:03 +00:00 committed by David S. Miller
parent 731abb9cb2
commit ef5e0d8237
1 changed files with 2 additions and 2 deletions
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4
net/bridge/br_multicast.c
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@ -1770,7 +1770,7 @@ int br_multicast_toggle(struct net_bridge *br, unsigned long val)
int err = 0;
struct net_bridge_mdb_htable *mdb;
spin_lock(&br->multicast_lock);
spin_lock_bh(&br->multicast_lock);
if (br->multicast_disabled == !val)
goto unlock;
@ -1806,7 +1806,7 @@ rollback:
}
unlock:
spin_unlock(&br->multicast_lock);
spin_unlock_bh(&br->multicast_lock);
return err;
}