tree 05f67206d6978261ad2569d3a0030f0299331191
parent 4d125de3a5d130054df2285e542c1491d214d3e8
author Anthony Liguori <aliguori@us.ibm.com> 1194472164 -0600
committer Rusty Russell <rusty@rustcorp.com.au> 1194836349 +1100

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>