From: Brian Foley <brian.foley@arm.com>
Date: Mon, 24 Sep 2012 13:33:42 +0000 (+0100)
Subject: virtio_mmio: Don't attempt to create empty virtqueues
X-Git-Tag: omap-for-v3.7-rc1/fixes-hwmod-clock-signed-v3~5^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d78b519f6b945aef6202bbb5b56f928572e15165;p=pandora-kernel.git

virtio_mmio: Don't attempt to create empty virtqueues

If a virtio device reports a QueueNumMax of 0, vring_new_virtqueue()
doesn't check this, and thanks to an unsigned (i < num - 1) loop
guard, scribbles over memory when initialising the free list.

Avoid by not trying to create zero-descriptor queues, as there's no
way to do any I/O with one.

Signed-off-by: Brian Foley <brian.foley@arm.com>
Signed-off-by: Pawel Moll <pawel.moll@arm.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
---

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