From 2bf4fd31394a3f875ea093ee8a209f30b378cbf3 Mon Sep 17 00:00:00 2001
From: Heinz Graalfs <graalfs@linux.vnet.ibm.com>
Date: Mon, 11 Nov 2013 11:52:43 +1030
Subject: [PATCH] virtio_scsi: verify if queue is broken after
 virtqueue_get_buf()

If virtqueue_get_buf() returned with a NULL pointer avoid a possibly
endless loop by checking for a broken virtqueue.

Signed-off-by: Heinz Graalfs <graalfs@linux.vnet.ibm.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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