linux-kernel - [PATCH] virtio: fix size computation according to the definition of struct vring_used in vring

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Message-ID: <4E584365.1010806@gmail.com>
Date:	Sat, 27 Aug 2011 09:07:49 +0800
From:	Wang Sheng-Hui <shhuiw@...il.com>
To:	rusty@...tcorp.com.au, mst@...hat.com,
	virtualization@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] virtio: fix size computation according to the definition
 of struct vring_used in vring_size

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@...il.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@...ssover-plinux:~/dev/patchwork$ 
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