From e75279c4fb853f42004cbabb6dbf6b23188dc163 Mon Sep 17 00:00:00 2001
From: Heinz Graalfs <graalfs@linux.vnet.ibm.com>
Date: Mon, 28 Apr 2014 11:24:05 +0930
Subject: [PATCH] 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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