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virtio: use unsigned int for virtqueue_get_avail_bytes() index 

The virtio code uses int, unsigned int, and uint16_t for virtqueue
indices.  The uint16_t is used for the low-level descriptor layout in
virtio_ring.h while code that isn't concerned with descriptor layout can
use unsigned int.

Use of int is problematic because it can result in signed/unsigned
comparison and incompatible int*/unsigned int* pointer types.

Make the virtqueue_get_avail_bytes() 'i' variable unsigned int.  This
eliminates the need to introduce casts and modify code further in the
patches that follow.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
This commit is contained in:
Stefan Hajnoczi 2016-09-21 16:52:23 +01:00 committed by Michael S. Tsirkin
parent d65abf85e7
commit b1c7c07f2d
1 changed files with 1 additions and 1 deletions
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2
hw/virtio/virtio.c
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@ -416,7 +416,7 @@ void virtqueue_get_avail_bytes(VirtQueue *vq, unsigned int *in_bytes,
unsigned int max, num_bufs, indirect = 0;
VRingDesc desc;
hwaddr desc_pa;
int i;
unsigned int i;
max = vq->vring.num;
num_bufs = total_bufs;