tree 73db65b94d0c8607ba2088178b6f00fa51bcc920
parent af1cc7a2b86ddb8668ac38097866bedd7b849a76
author Jason Wang <jasowang@redhat.com> 1480483072 +0800
committer David S. Miller <davem@davemloft.net> 1480536362 -0500

macvtap: handle ubuf refcount correctly when meet errors

We trigger uarg->callback() immediately after we decide do datacopy
even if caller want to do zerocopy. This will cause the callback
(vhost_net_zerocopy_callback) decrease the refcount. But when we meet
an error afterwards, the error handling in vhost handle_tx() will try
to decrease it again. This is wrong and fix this by delay the
uarg->callback() until we're sure there's no errors.

Signed-off-by: Jason Wang <jasowang@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>