From: Ian Campbell <ian.campbell@citrix.com>
Date: Tue, 19 May 2009 06:25:48 +0000 (+0200)
Subject: xen/blkfront: allow xenbus state transition to Closing->Closed  when not Connected
X-Git-Tag: v2.6.30-rc7~17^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=28afea5b2ffaa48f4f43d22ae8edcc384c05df80;p=pandora-kernel.git

xen/blkfront: allow xenbus state transition to Closing->Closed  when not Connected

This situation can occur when attempting to attach a block device whose
backend is an empty physical CD-ROM driver. The backend in this case
will go directly from the Initialising state to Closing->Closed.
Previously this would result in a NULL pointer deref on info->gd
(xenbus_dev_fatal does not return as a1a15ac5 seems to expect)

Cc: stable@kernel.org
Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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