Subject: [PATCH v3 1/8] vhost: Not cleaning batched descs in VHOST_SET_VRING_BASE ioctl

From: Eugenio Pérez <[email-masked]>
Date: Sat, 18 Apr 2020 12:22:10 +0200

They are cleaned in vhost_vq_set_backend, which can be called with an
active backend. To set and remove backends already clean batched
descriptors, so to do it here is completely redundant.

Fixes: ("e7539c20a4a6 vhost: batching fetches")

Signed-off-by: Eugenio Pérez <[email-masked]>
---
 drivers/vhost/vhost.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index 0395229486a9..882d0df57e24 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -1579,7 +1579,6 @@ long vhost_vring_ioctl(struct vhost_dev *d, unsigned int ioctl, void __user *arg
 		vq->last_avail_idx = s.num;
 		/* Forget the cached index value. */
 		vq->avail_idx = vq->last_avail_idx;
-		vq->ndescs = vq->first_desc = 0;
 		break;
 	case VHOST_GET_VRING_BASE:
 		s.index = idx;
-- 
2.18.1