[PATCH net-next 1/5] virtio_ring: allow to store zero as the ctx

Jason Wang
Mon, 17 Jul 2017 12:43:57 -0000

Allow zero to be store as a ctx, with this we could store e.g zero
value which could be meaningful for the case of storing headroom
through ctx.

Signed-off-by: Jason Wang <jasowang at redhat.com>
---
 drivers/virtio/virtio_ring.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index 5e1b548..9aaa177 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -391,7 +391,7 @@ static inline int virtqueue_add(struct virtqueue *_vq,
 	vq->desc_state[head].data = data;
 	if (indirect)
 		vq->desc_state[head].indir_desc = desc;
-	if (ctx)
+	else
 		vq->desc_state[head].indir_desc = ctx;

 	/* Put entry in available array (but don't update avail->idx until they
--
2.7.4