From: Lars Ellenberg <lars.ellenberg@linbit.com>
Date: Wed, 1 Sep 2010 07:50:23 +0000 (+0200)
Subject: drbd: fix race between deconfiguring and reconfiguring network
X-Git-Tag: v2.6.37-rc1~167^2~36
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c518d04fdec3d8b9d6f8b2228040934de9ee6708;p=pandora-kernel.git

drbd: fix race between deconfiguring and reconfiguring network

If a drbd_nl_net_conf hits the small window between the state change
to C_STANDALONE and the corresponding cleanup in after_state_ch,
that cleanup would throw away stuff we now need again,
and later trigger BUG_ON()s.

Fixed by properly serializing the new config request with
any pending cleanup.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
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