xen/netback: Wake dealloc thread after completing zerocopy work

[linux-drm-fsl-dcu.git] / drivers / net / xen-netback / interface.c

diff --git a/drivers/net/xen-netback/interface.c b/drivers/net/xen-netback/interface.c
index 1a83e190fc15e4158b5e441cc267ad149d465abe..28577a31549d1569032d63457464fe11fdf44d32 100644 (file)
--- a/drivers/net/xen-netback/interface.c
+++ b/drivers/net/xen-netback/interface.c
@@ -61,6 +61,12 @@ void xenvif_skb_zerocopy_prepare(struct xenvif_queue *queue,
 void xenvif_skb_zerocopy_complete(struct xenvif_queue *queue)
 {
        atomic_dec(&queue->inflight_packets);
+
+       /* Wake the dealloc thread _after_ decrementing inflight_packets so
+        * that if kthread_stop() has already been called, the dealloc thread
+        * does not wait forever with nothing to wake it.
+        */
+       wake_up(&queue->dealloc_wq);
 }
 
 int xenvif_schedulable(struct xenvif *vif)