vhost: break out of polling loop on error

[mv-sheeva.git] / drivers / vhost / net.c

diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
index 0f41c9195e9bb9942adc2e6e15a43af4a34393e2..54096eef48405c23b5b6ec1944509e16c855b6ca 100644 (file)
--- a/drivers/vhost/net.c
+++ b/drivers/vhost/net.c
@@ -98,7 +98,8 @@ static void tx_poll_start(struct vhost_net *net, struct socket *sock)
 static void handle_tx(struct vhost_net *net)
 {
        struct vhost_virtqueue *vq = &net->dev.vqs[VHOST_NET_VQ_TX];
-       unsigned head, out, in, s;
+       unsigned out, in, s;
+       int head;
        struct msghdr msg = {
                .msg_name = NULL,
                .msg_namelen = 0,
@@ -135,6 +136,9 @@ static void handle_tx(struct vhost_net *net)
                                         ARRAY_SIZE(vq->iov),
                                         &out, &in,
                                         NULL, NULL);
+               /* On error, stop handling until the next kick. */
+               if (head < 0)
+                       break;
                /* Nothing new?  Wait for eventfd to tell us they refilled. */
                if (head == vq->num) {
                        wmem = atomic_read(&sock->sk->sk_wmem_alloc);
@@ -192,7 +196,8 @@ static void handle_tx(struct vhost_net *net)
 static void handle_rx(struct vhost_net *net)
 {
        struct vhost_virtqueue *vq = &net->dev.vqs[VHOST_NET_VQ_RX];
-       unsigned head, out, in, log, s;
+       unsigned out, in, log, s;
+       int head;
        struct vhost_log *vq_log;
        struct msghdr msg = {
                .msg_name = NULL,
@@ -228,6 +233,9 @@ static void handle_rx(struct vhost_net *net)
                                         ARRAY_SIZE(vq->iov),
                                         &out, &in,
                                         vq_log, &log);
+               /* On error, stop handling until the next kick. */
+               if (head < 0)
+                       break;
                /* OK, now we need to know about added descriptors. */
                if (head == vq->num) {
                        if (unlikely(vhost_enable_notify(vq))) {