UPSTREAM: vhost/vsock: drop space available check for TX vq

Remove unnecessary use of enable/disable callback notifications
and the incorrect more space available check.

The virtio_transport_tx_work handles when the TX virtqueue
has more buffers available.

Signed-off-by: Gerard Garcia <ggarcia@deic.uab.cat>
Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

(cherry picked from commit 21bc54fc0cdc31de72b57d2b3c79cf9c2b83cf39)

BUG=chromium:763970
TEST=build caroline with USE=kvm_host

Change-Id: I1733711b6b87493e3789969ff2cf4b2da00567c0
Signed-off-by: Chirantan Ekbote <chirantan@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/669379
Signed-off-by: Sonny Rao <sonnyrao@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/1058969
Reviewed-by: Guenter Roeck <groeck@chromium.org>
1 file changed