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From: Luigi Rizzo <luigi@FreeBSD.org>
Date: Wed, 4 Jun 2014 16:57:05 +0000 (UTC)
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Subject: svn commit: r267065 - head/sys/dev/virtio/network
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Author: luigi
Date: Wed Jun  4 16:57:05 2014
New Revision: 267065
URL: http://svnweb.freebsd.org/changeset/base/267065

Log:
  make sure ifp->if_transmit returns 0 if a buffer is enqueued.
  A similar fix should be applied to vmxnet, ixgbe, igb, i40e.
  (some of them previously reported by Michael Tuexen)
  
  Drivers using if_transmit are correct, and so are most of the
  other drivers that reassing if_transmit.
  
  Among other things, this bug causes panics when using netmap emulation
  on top of generic drivers.
  
  Approved by:	bryanv
  MFC after:	3 days

Modified:
  head/sys/dev/virtio/network/if_vtnet.c

Modified: head/sys/dev/virtio/network/if_vtnet.c
==============================================================================
--- head/sys/dev/virtio/network/if_vtnet.c	Wed Jun  4 16:55:38 2014	(r267064)
+++ head/sys/dev/virtio/network/if_vtnet.c	Wed Jun  4 16:57:05 2014	(r267065)
@@ -2262,7 +2262,6 @@ vtnet_txq_mq_start_locked(struct vtnet_t
 	while ((m = drbr_peek(ifp, br)) != NULL) {
 		if (virtqueue_full(vq)) {
 			drbr_putback(ifp, br, m);
-			error = ENOBUFS;
 			break;
 		}
 
@@ -2285,7 +2284,7 @@ vtnet_txq_mq_start_locked(struct vtnet_t
 		txq->vtntx_watchdog = VTNET_TX_TIMEOUT;
 	}
 
-	return (error);
+	return (0);
 }
 
 static int