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| author | Michael S. Tsirkin <mst@redhat.com> | 2010-06-24 16:59:59 +0300 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2010-06-27 11:52:25 +0300 |
| commit | d5675bd204efd87a174eeea592de23c4c4e7f908 (patch) | |
| tree | 11ec7e455d21285da68fa7db40af07ebf45f9d0e /drivers/vhost/net.c | |
| parent | 38000a94a902e94ca8b5498f7871c6316de8957a (diff) | |
| download | lwn-d5675bd204efd87a174eeea592de23c4c4e7f908.tar.gz lwn-d5675bd204efd87a174eeea592de23c4c4e7f908.zip | |
vhost: break out of polling loop on error
When ring parsing fails, we currently handle this
as ring empty condition. This means that we enable
kicks and recheck ring empty: if this not empty,
we re-start polling which of course will fail again.
Instead, let's return a negative error code and stop polling.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'drivers/vhost/net.c')
| -rw-r--r-- | drivers/vhost/net.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c index 0f41c9195e9b..54096eef4840 100644 --- 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))) { |