From: Anthony Liguori <aliguori@us.ibm.com>
Date: Wed, 7 Nov 2007 21:49:24 +0000 (-0600)
Subject: virtio: Fix used_idx wrap-around
X-Git-Tag: v2.6.24-rc3~154^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1bc4953ed44454c7f53d0b609445d1534981ee75;p=pandora-kernel.git

virtio: Fix used_idx wrap-around

The more_used() function compares the vq->vring.used->idx with last_used_idx.
Since vq->vring.used->idx is a 16-bit integer, and last_used_idx is an
unsigned int, this results in unpredictable behavior when vq->vring.used->idx
wraps around.

This patch corrects this by changing last_used_idx to the correct type.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
---

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