Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=1bc4953ed44454c7f53d0b609445d1534981ee75
Commit: 1bc4953ed44454c7f53d0b609445d1534981ee75
Parent: 4d125de3a5d130054df2285e542c1491d214d3e8
Author: Anthony Liguori <[EMAIL PROTECTED]>
AuthorDate: Wed Nov 7 15:49:24 2007 -0600
Committer: Rusty Russell <[EMAIL PROTECTED]>
CommitDate: Mon Nov 12 13:59:09 2007 +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 <[EMAIL PROTECTED]>
Signed-off-by: Rusty Russell <[EMAIL PROTECTED]>
---
drivers/virtio/virtio_ring.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index 0e4baca..0e1bf05 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);
-
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