[PATCH] vhost: fix return value of vhost_get_vq_desc

[Eugenio PÃrez]

Before of the batch change, it was the chain's head. Need to keep that
way or we will not be able to free a chain of descriptors.

Fixes: eccb852f1fe6 ("vhost: batching fetches")
---
 drivers/vhost/vhost.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index b5a51b1f2e79..fc422c3e5c08 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -2409,12 +2409,11 @@ int vhost_get_vq_desc(struct vhost_virtqueue *vq,
 			*out_num += ret;
 		}
 
-		ret = desc->id;
-
 		if (!(desc->flags & VRING_DESC_F_NEXT))
 			break;
 	}
 
+	ret = vq->descs[vq->first_desc].id;
 	vq->first_desc = i + 1;
 
 	return ret;
-- 
2.18.1