From: Philipp Reisner <philipp.reisner@linbit.com>
Date: Wed, 2 Jun 2010 12:31:29 +0000 (+0200)
Subject: drbd: Fixed a race between disk-attach and unexpected state changes
X-Git-Tag: v2.6.35-rc4~43^2~8^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=dc66c74de6f4238020db3e2041d4aca5c5b3e9bc;p=pandora-kernel.git

drbd: Fixed a race between disk-attach and unexpected state changes

This was a very hard to trigger race condition.

If we got a state packet from the peer, after drbd_nl_disk() has
already changed the disk state to D_NEGOTIATING but
after_state_ch() was not yet run by the worker, then receive_state()
might called drbd_sync_handshake(), which in turn crashed
when accessing p_uuid.

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