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authorAnthony Liguori <aliguori@us.ibm.com>2007-11-07 15:49:24 -0600
committerRusty Russell <rusty@rustcorp.com.au>2007-11-12 13:59:09 +1100
commit1bc4953ed44454c7f53d0b609445d1534981ee75 (patch)
tree05f67206d6978261ad2569d3a0030f0299331191 /drivers/virtio/virtio_ring.c
parent4d125de3a5d130054df2285e542c1491d214d3e8 (diff)
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>
Diffstat (limited to 'drivers/virtio/virtio_ring.c')
-rw-r--r--drivers/virtio/virtio_ring.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index 0e4baca21b8f..0e1bf053d8cd 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -53,7 +53,7 @@ struct vring_virtqueue
unsigned int num_added;
/* Last used index we've seen. */
- unsigned int last_used_idx;
+ u16 last_used_idx;
/* How to notify other side. FIXME: commonalize hcalls! */
void (*notify)(struct virtqueue *vq);