From 44a1baeb5e0984ed4d80aa7ec2b74a005a5bf7a6 Mon Sep 17 00:00:00 2001
From: Gerard Garcia <ggarcia@deic.uab.cat>
Date: Wed, 10 Aug 2016 17:24:34 +0200
Subject: [PATCH 14/44] 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)
---
 net/vmw_vsock/virtio_transport.c | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/net/vmw_vsock/virtio_transport.c b/net/vmw_vsock/virtio_transport.c
index 699dfabdbccd..936d7eee62d0 100644
--- a/net/vmw_vsock/virtio_transport.c
+++ b/net/vmw_vsock/virtio_transport.c
@@ -87,9 +87,6 @@ virtio_transport_send_pkt_work(struct work_struct *work)
 
 	vq = vsock->vqs[VSOCK_VQ_TX];
 
-	/* Avoid unnecessary interrupts while we're processing the ring */
-	virtqueue_disable_cb(vq);
-
 	for (;;) {
 		struct virtio_vsock_pkt *pkt;
 		struct scatterlist hdr, buf, *sgs[2];
@@ -99,7 +96,6 @@ virtio_transport_send_pkt_work(struct work_struct *work)
 		spin_lock_bh(&vsock->send_pkt_list_lock);
 		if (list_empty(&vsock->send_pkt_list)) {
 			spin_unlock_bh(&vsock->send_pkt_list_lock);
-			virtqueue_enable_cb(vq);
 			break;
 		}
 
@@ -118,13 +114,13 @@ virtio_transport_send_pkt_work(struct work_struct *work)
 		}
 
 		ret = virtqueue_add_sgs(vq, sgs, out_sg, in_sg, pkt, GFP_KERNEL);
+		/* Usually this means that there is no more space available in
+		 * the vq
+		 */
 		if (ret < 0) {
 			spin_lock_bh(&vsock->send_pkt_list_lock);
 			list_add(&pkt->list, &vsock->send_pkt_list);
 			spin_unlock_bh(&vsock->send_pkt_list_lock);
-
-			if (!virtqueue_enable_cb(vq) && ret == -ENOSPC)
-				continue; /* retry now that we have more space */
 			break;
 		}
 
-- 
2.13.0

