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authorJason Wang <jasowang@redhat.com>2012-05-02 11:42:54 +0800
committerMichael S. Tsirkin <mst@redhat.com>2012-05-02 18:22:25 +0300
commitc70aa540c7a9f67add11ad3161096fb95233aa2e (patch)
treec02be13561a4a9347efd42cb6379950e5e277025 /drivers/vhost
parentc8fb217af57c6c232af3517d3115d2af4ce9900e (diff)
downloadlinux-linaro-stable-c70aa540c7a9f67add11ad3161096fb95233aa2e.tar.gz
vhost: zerocopy: poll vq in zerocopy callback
We add used and signal guest in worker thread but did not poll the virtqueue during the zero copy callback. This may lead the missing of adding and signalling during zerocopy. Solve this by polling the virtqueue and let it wakeup the worker during callback. Signed-off-by: Jason Wang <jasowang@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'drivers/vhost')
-rw-r--r--drivers/vhost/vhost.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index 51e4c1eeec4f..94dbd25caa30 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -1603,6 +1603,7 @@ void vhost_zerocopy_callback(struct ubuf_info *ubuf)
struct vhost_ubuf_ref *ubufs = ubuf->ctx;
struct vhost_virtqueue *vq = ubufs->vq;
+ vhost_poll_queue(&vq->poll);
/* set len = 1 to mark this desc buffers done DMA */
vq->heads[ubuf->desc].len = VHOST_DMA_DONE_LEN;
kref_put(&ubufs->kref, vhost_zerocopy_done_signal);