From: Heinz Graalfs <graalfs@linux.vnet.ibm.com>
Date: Wed, 5 Mar 2014 14:23:54 +0000 (+0100)
Subject: virtio_ccw: fix hang in set offline processing
X-Git-Tag: v3.15-rc1~118^2~33^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=79629b208fc0484ee448c4acfa3762f0350e97ce;p=pandora-kernel.git

virtio_ccw: fix hang in set offline processing

During set offline processing virtio_grab_drvdata() incorrectly
calls dev_set_drvdata() to remove the virtio_ccw_device from the
parent ccw_device's driver data. This is wrong and ends up in a
hang during virtio_ccw_reset(), as the interrupt handler still
has need of the virtio_ccw_device.

A new field 'going_away' is introduced in struct virtio_ccw_device
to control the usage of the ccw_device's driver data pointer in
virtio_grab_drvdata().

Signed-off-by: Heinz Graalfs <graalfs@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
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