Messages in this thread Patch in this message | | | Date | Sat, 27 Aug 2011 09:07:49 +0800 | From | Wang Sheng-Hui <> | Subject | [PATCH] virtio: fix size computation according to the definition of struct vring_used in vring_size |
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The patch is against 3.1-rc3.
struct vring_used has two __u16 fields plus array of struct vring_used_elem. Current vring_size counts the __u16 fields to 3. Fix it to 2 in the patch.
Signed-off-by: Wang Sheng-Hui <shhuiw@gmail.com> --- include/linux/virtio_ring.h | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/include/linux/virtio_ring.h b/include/linux/virtio_ring.h index 4a32cb6..fcda152 100644 --- a/include/linux/virtio_ring.h +++ b/include/linux/virtio_ring.h @@ -143,7 +143,7 @@ static inline unsigned vring_size(unsigned int num, unsigned long align) { return ((sizeof(struct vring_desc) * num + sizeof(__u16) * (2 + num) + align - 1) & ~(align - 1)) - + sizeof(__u16) * 3 + sizeof(struct vring_used_elem) * num; + + sizeof(__u16) * 2 + sizeof(struct vring_used_elem) * num; } /* The following is used with USED_EVENT_IDX and AVAIL_EVENT_IDX */ -- 1.7.1 crossover@crossover-plinux:~/dev/patchwork$
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