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Message-Id: <11944039492411-git-send-email-aliguori@us.ibm.com>
Date: Tue, 6 Nov 2007 20:52:29 -0600
From: Anthony Liguori <aliguori@...ibm.com>
To: linux-kernel@...r.kernel.org
Cc: Anthony Liguori <aliguori@...ibm.com>,
Rusty Russell <rusty@...ycorp.com.au>,
virtualization@...ts.osdl.org
Subject: [PATCH][VIRTIO] Fix vring_init() ring computations
This patch fixes a typo in vring_init(). This happens to work today in lguest
because the sizeof(struct vring_desc) is 16 and struct vring contains 3
pointers and an unsigned int so on 32-bit
sizeof(struct vring_desc) == sizeof(struct vring). However, this is no longer
true on 64-bit where the bug is exposed.
Signed-off-by: Anthony Liguori <aliguori@...ibm.com>
diff --git a/include/linux/virtio_ring.h b/include/linux/virtio_ring.h
index ac69e7b..5b88d21 100644
--- a/include/linux/virtio_ring.h
+++ b/include/linux/virtio_ring.h
@@ -92,8 +92,8 @@ static inline void vring_init(struct vring *vr, unsigned int num, void *p)
{
vr->num = num;
vr->desc = p;
- vr->avail = p + num*sizeof(struct vring);
- vr->used = p + (num+1)*(sizeof(struct vring) + sizeof(__u16));
+ vr->avail = p + num*sizeof(struct vring_desc);
+ vr->used = p + (num+1)*(sizeof(struct vring_desc) + sizeof(__u16));
}
static inline unsigned vring_size(unsigned int num)
-
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