[Qemu-devel] [qemu-devel]question on virtqueue_get_avail_bytes

[yinyin]

Hi,all:
        in func 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);
        is it right？or should we update desc_pa first, then init i to 0?

diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
index 09f62c6..554ae6f 100644
--- a/hw/virtio/virtio.c
+++ b/hw/virtio/virtio.c
@@ -377,8 +377,8 @@ void virtqueue_get_avail_bytes(VirtQueue *vq, unsigned int 
*in_bytes,
             /* 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);
+           num_bufs = i = 0;
         }
 
         do {