tree c9a706ec6d539aad6f1aacd4201577ddcc2a8d24
parent 96b14536d935848cffd904f583f67c66169002d8
author Heinz Graalfs <graalfs@linux.vnet.ibm.com> 1394029434 +0100
committer Cornelia Huck <cornelia.huck@de.ibm.com> 1394097760 +0100

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>