Have vio_start() check if the queue is empty.

from brad@

diff --git a/sys/dev/pci/if_vio.c b/sys/dev/pci/if_vio.c
index 9a297e1..7235e86 100644 (file)
--- a/sys/dev/pci/if_vio.c
+++ b/sys/dev/pci/if_vio.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: if_vio.c,v 1.29 2015/04/26 12:19:24 sf Exp $  */
+/*     $OpenBSD: if_vio.c,v 1.30 2015/04/26 12:27:29 sf Exp $  */
 
 /*
  * Copyright (c) 2012 Stefan Fritsch, Alexander Fiveg.
@@ -726,6 +726,8 @@ vio_start(struct ifnet *ifp)
 
        if ((ifp->if_flags & (IFF_RUNNING|IFF_OACTIVE)) != IFF_RUNNING)
                return;
+       if (IFQ_IS_EMPTY(&ifp->if_snd))
+               return;
 
 again:
        for (;;) {
@@ -1117,8 +1119,7 @@ vio_tx_intr(struct virtqueue *vq)
        int r;
 
        r = vio_txeof(vq);
-       if (!IFQ_IS_EMPTY(&ifp->if_snd))
-               vio_start(ifp);
+       vio_start(ifp);
        return r;
 }