Re: [B.A.T.M.A.N.] [PATCH 2/2] batman-adv: Avoid deadlock between rtnl_lock and s_active

On Tuesday 03 May 2011 13:10:06 Linus Lüssing wrote:

From: Sven Eckelmann sven@narfation.org

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.

Applied in b278a6c.

Thanks, Marek