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vhost: drop hard-coded num_buffers size

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The 2 that we use for copy_to_iter comes from sizeof(u16),
it used to be that way before the iov iter update.
Fix it up, making it obvious the size of stack access
is right.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Michael S. Tsirkin 2015-02-25 15:20:01 +01:00 committed by David S. Miller
parent 4c5a84421c
commit 0d79a493e5
1 changed files with 2 additions and 1 deletions
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3
drivers/vhost/net.c
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@ -621,7 +621,8 @@ static void handle_rx(struct vhost_net *net)
num_buffers = cpu_to_vhost16(vq, headcount);
if (likely(mergeable) &&
copy_to_iter(&num_buffers, 2, &fixup) != 2) {
copy_to_iter(&num_buffers, sizeof num_buffers,
&fixup) != sizeof num_buffers) {
vq_err(vq, "Failed num_buffers write");
vhost_discard_vq_desc(vq, headcount);
break;