From: Heinz Graalfs <graalfs@linux.vnet.ibm.com>
Date: Mon, 28 Apr 2014 01:54:05 +0000 (+0930)
Subject: virtio_ccw: introduce device_lost in virtio_ccw_device
X-Git-Tag: omap-for-v3.16/fixes-against-rc1~46^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e75279c4fb853f42004cbabb6dbf6b23188dc163;p=pandora-kernel.git

virtio_ccw: introduce device_lost in virtio_ccw_device

When a device is lost, the common I/O layer calls the notification
handler with CIO_GONE: In that event, flag device_lost as true.

In case the device had been flagged as lost when the remove/offline callbacks
are called, call the new virtio_break_device() function prior to invoking
device_unregister(). This avoids hangs of I/O triggered via the device
unregistration callbacks.

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