]> git.baikalelectronics.ru Git - kernel.git/commit
batman-adv: Avoid deadlock between rtnl_lock and s_active
authorSven Eckelmann <sven@narfation.org>
Tue, 3 May 2011 11:10:06 +0000 (13:10 +0200)
committerSven Eckelmann <sven@narfation.org>
Sun, 8 May 2011 14:10:42 +0000 (16:10 +0200)
commit3a995745d6dcaaff7eeb8428b012c0dd25a07b4c
treea3448104babf921c217a1e94c2e46d5bd7613a2d
parent92f5cd9cab915aa78eb19d8a4aea58769d116e33
batman-adv: Avoid deadlock between rtnl_lock and s_active

The hard_if_event is called by the notifier with rtnl_lock and tries to
remove sysfs entries when a NETDEV_UNREGISTER event is received. This
will automatically take the s_active lock.

The s_active lock is also used when a new interface is added to a meshif
through sysfs. In that situation we cannot wait for the rntl_lock before
creating the actual batman-adv interface to prevent a deadlock. It is
still possible to try to get the rtnl_lock and immediately abort the
current operation when the trylock call failed.

Signed-off-by: Sven Eckelmann <sven@narfation.org>
net/batman-adv/bat_sysfs.c