[PATCH] nbd: add missed destroy_workqueue when nbd_start_device fails

[Li Heng]

destroy_workqueue() should be called to destroy ndev->tx_wq
when nbd_start_device init resources fails.

Reported-by: Hulk Robot <hulkci@xxxxxxxxxx>
Signed-off-by: Li Heng <liheng40@xxxxxxxxxx>
---
 drivers/block/nbd.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index ce7e9f22..45e0a9f4 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -4,7 +4,7 @@
  *
  * Note that you can not swap over this thing, yet. Seems to work but
  * deadlocks sometimes - you can not swap over TCP in general.
- * 
+ *
  * Copyright 1997-2000, 2008 Pavel Machek <pavel@xxxxxx>
  * Parts copyright 2001 Steven Whitehouse <steve@xxxxxxxxxxx>
  *
@@ -1270,6 +1270,7 @@ static int nbd_start_device(struct nbd_device *nbd)
 	error = device_create_file(disk_to_dev(nbd->disk), &pid_attr);
 	if (error) {
 		dev_err(disk_to_dev(nbd->disk), "device_create_file failed!\n");
+		destroy_workqueue(nbd->recv_workq);
 		return error;
 	}
 	set_bit(NBD_RT_HAS_PID_FILE, &config->runtime_flags);
@@ -1291,6 +1292,7 @@ static int nbd_start_device(struct nbd_device *nbd)
 			 */
 			if (i)
 				flush_workqueue(nbd->recv_workq);
+			destroy_workqueue(nbd->recv_workq);
 			return -ENOMEM;
 		}
 		sk_set_memalloc(config->socks[i]->sock->sk);
-- 
2.7.4