From: Shirley Ma <mashirle@us.ibm.com>
Date: Wed, 20 Jul 2011 17:23:12 +0000 (-0700)
Subject: vhost: handle wrap around in # of bufs math
X-Git-Tag: v3.1-rc1~316^2~1^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9e380825ab3f5176f65306c4ac119fd23634ce03;p=pandora-kernel.git

vhost: handle wrap around in # of bufs math

The meth for calculating the # of outstanding buffers gives
incorrect results when vq->upend_idx wraps around zero.
Fix that.

Signed-off-by: Shirley Ma <xma@us.ibm.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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