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virtio: pass argument by value for virtqueue_map_iovec() 

Pass num_sg by value instead of by pointer, as num_sg is never modified in
virtqueue_map_iovec().

Signed-off-by: Dongli Zhang <dongli.zhang@oracle.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <1541139396-4727-1-git-send-email-dongli.zhang@oracle.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
Dongli Zhang 2018-11-02 14:16:36 +08:00 committed by Laurent Vivier
parent 27c6ef1b58
commit e4fbf5b245
1 changed files with 4 additions and 4 deletions
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8
hw/virtio/virtio.c
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@ -796,13 +796,13 @@ static void virtqueue_undo_map_desc(unsigned int out_num, unsigned int in_num,
} }
static void virtqueue_map_iovec(VirtIODevice *vdev, struct iovec *sg, static void virtqueue_map_iovec(VirtIODevice *vdev, struct iovec *sg,
hwaddr *addr, unsigned int *num_sg, hwaddr *addr, unsigned int num_sg,
int is_write) int is_write)
{ {
unsigned int i; unsigned int i;
hwaddr len; hwaddr len;
for (i = 0; i < *num_sg; i++) { for (i = 0; i < num_sg; i++) {
len = sg[i].iov_len; len = sg[i].iov_len;
sg[i].iov_base = dma_memory_map(vdev->dma_as, sg[i].iov_base = dma_memory_map(vdev->dma_as,
addr[i], &len, is_write ? addr[i], &len, is_write ?
@ -821,8 +821,8 @@ static void virtqueue_map_iovec(VirtIODevice *vdev, struct iovec *sg,
void virtqueue_map(VirtIODevice *vdev, VirtQueueElement *elem) void virtqueue_map(VirtIODevice *vdev, VirtQueueElement *elem)
{ {
virtqueue_map_iovec(vdev, elem->in_sg, elem->in_addr, &elem->in_num, 1); virtqueue_map_iovec(vdev, elem->in_sg, elem->in_addr, elem->in_num, 1);
virtqueue_map_iovec(vdev, elem->out_sg, elem->out_addr, &elem->out_num, 0); virtqueue_map_iovec(vdev, elem->out_sg, elem->out_addr, elem->out_num, 0);
} }
static void *virtqueue_alloc_element(size_t sz, unsigned out_num, unsigned in_num) static void *virtqueue_alloc_element(size_t sz, unsigned out_num, unsigned in_num)