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virtio: virtqueue_get_avail_bytes: fix desc_pa when loop over the indirect descriptor table 

virtqueue_get_avail_bytes: when found a indirect desc, we need loop over it.
           /* loop over the indirect descriptor table */
           indirect = 1;
           max = vring_desc_len(desc_pa, i) / sizeof(VRingDesc);
           num_bufs = i = 0;
           desc_pa = vring_desc_addr(desc_pa, i);
But, It init i to 0, then use i to update desc_pa. so we will always get:
desc_pa = vring_desc_addr(desc_pa, 0);
the last two line should swap.

Cc: qemu-stable@nongnu.org
Signed-off-by: Yin Yin <yin.yin@cs2c.com.cn>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
yinyin 2013-08-22 14:47:16 +08:00 committed by Michael S. Tsirkin
parent 1e09955619
commit 1ae2757c6c
1 changed files with 1 additions and 1 deletions
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2
hw/virtio/virtio.c
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@ -377,8 +377,8 @@ void virtqueue_get_avail_bytes(VirtQueue *vq, unsigned int *in_bytes,
/* loop over the indirect descriptor table */ /* loop over the indirect descriptor table */
indirect = 1; indirect = 1;
max = vring_desc_len(desc_pa, i) / sizeof(VRingDesc); max = vring_desc_len(desc_pa, i) / sizeof(VRingDesc);
num_bufs = i = 0;
desc_pa = vring_desc_addr(desc_pa, i); desc_pa = vring_desc_addr(desc_pa, i);
num_bufs = i = 0;
} }
do { do {