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From 358bb0daa1ce332a18cc996fcd078a3989f77d36 Mon Sep 17 00:00:00 2001
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From: yinyin <yin.yin@cs2c.com.cn>
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Date: Thu, 22 Aug 2013 14:47:16 +0800
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Subject: [PATCH] virtio: virtqueue_get_avail_bytes: fix desc_pa when loop over
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the indirect descriptor table
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virtqueue_get_avail_bytes: when found a indirect desc, we need loop over it.
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/* loop over the indirect descriptor table */
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indirect = 1;
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max = vring_desc_len(desc_pa, i) / sizeof(VRingDesc);
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num_bufs = i = 0;
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desc_pa = vring_desc_addr(desc_pa, i);
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But, It init i to 0, then use i to update desc_pa. so we will always get:
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desc_pa = vring_desc_addr(desc_pa, 0);
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the last two line should swap.
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Cc: qemu-stable@nongnu.org
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Signed-off-by: Yin Yin <yin.yin@cs2c.com.cn>
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Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
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Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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(cherry picked from commit 1ae2757c6c4525c9b42f408c86818f843bad7418)
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Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
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---
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hw/virtio/virtio.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
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index f03c45d..2f1e73b 100644
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--- a/hw/virtio/virtio.c
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+++ b/hw/virtio/virtio.c
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@@ -377,8 +377,8 @@ void virtqueue_get_avail_bytes(VirtQueue *vq, unsigned int *in_bytes,
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/* loop over the indirect descriptor table */
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indirect = 1;
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max = vring_desc_len(desc_pa, i) / sizeof(VRingDesc);
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- num_bufs = i = 0;
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desc_pa = vring_desc_addr(desc_pa, i);
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+ num_bufs = i = 0;
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}
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do {
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