[PATCH] net: usb: enable the work after stop usbnet by ip down/up

[Jun Miao]

From: Zqiang <qiang.zhang@xxxxxxxxx>

Oleksij reported that:
The smsc95xx driver fails after one down/up cycle, like this:
 $ nmcli device set enu1u1 managed no
 $ p a a 10.10.10.1/24 dev enu1u1
 $ ping -c 4 10.10.10.3
 $ ip l s dev enu1u1 down
 $ ip l s dev enu1u1 up
 $ ping -c 4 10.10.10.3
The second ping does not reach the host. Networking also fails on other interfaces.

Enable the work by replacing the disable_work_sync() with cancel_work_sync().

[Jun Miao: completely write the commit changelog]

Fixes: 2c04d279e857 ("net: usb: Convert tasklet API to new bottom half workqueue mechanism")
Reported-by: Oleksij Rempel <o.rempel@xxxxxxxxxxxxxx>
Tested-by: Oleksij Rempel <o.rempel@xxxxxxxxxxxxxx>
Signed-off-by: Zqiang <qiang.zhang@xxxxxxxxx>
Signed-off-by: Jun Miao <jun.miao@xxxxxxxxx>
---
 drivers/net/usb/usbnet.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/usb/usbnet.c b/drivers/net/usb/usbnet.c
index 9564478a79cc..6a3cca104af9 100644
--- a/drivers/net/usb/usbnet.c
+++ b/drivers/net/usb/usbnet.c
@@ -861,14 +861,14 @@ int usbnet_stop (struct net_device *net)
 	/* deferred work (timer, softirq, task) must also stop */
 	dev->flags = 0;
 	timer_delete_sync(&dev->delay);
-	disable_work_sync(&dev->bh_work);
+	cancel_work_sync(&dev->bh_work);
 	cancel_work_sync(&dev->kevent);
 
 	/* We have cyclic dependencies. Those calls are needed
 	 * to break a cycle. We cannot fall into the gaps because
 	 * we have a flag
 	 */
-	disable_work_sync(&dev->bh_work);
+	cancel_work_sync(&dev->bh_work);
 	timer_delete_sync(&dev->delay);
 	cancel_work_sync(&dev->kevent);
 
-- 
2.32.0