From: Heinz Graalfs <graalfs@linux.vnet.ibm.com>
Date: Mon, 28 Oct 2013 23:10:39 +0000 (+1030)
Subject: virtio_console: verify if queue is broken after virtqueue_get_buf()
X-Git-Tag: v3.13-rc1~82^2~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=40e4dc530118dbb79e270d5554ac8415588378d2;p=pandora-kernel.git

virtio_console: verify if queue is broken after virtqueue_get_buf()

If virtqueue_get_buf() returns with a NULL pointer it should be verified
if the virtqueue is broken, in order to avoid loop calling cpu_relax().

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