Revert "usb: cdc-wdm: Fix a sleep-in-atomic-context bug in service_outstanding_interrupt()"

BugLink: https://bugs.launchpad.net/bugs/1798770

commit e871db8d upstream.

This reverts commit 6e22e3af.

The bug the patch describes to, has been already fixed in commit
2df69484 ("USB: cdc-wdm: don't enable interrupts in USB-giveback")
so need to this, revert it.

Fixes: 6e22e3af ("usb: cdc-wdm: Fix a sleep-in-atomic-context bug in service_outstanding_interrupt()")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>

drivers/usb/class/cdc-wdm.c

@@ -453,7 +453,7 @@ static int clear_wdm_read_flag(struct wdm_device *desc)
 
 	set_bit(WDM_RESPONDING, &desc->flags);
 	spin_unlock_irq(&desc->iuspin);
-	rv = usb_submit_urb(desc->response, GFP_ATOMIC);
+	rv = usb_submit_urb(desc->response, GFP_KERNEL);
 	spin_lock_irq(&desc->iuspin);
 	if (rv) {
 		dev_err(&desc->intf->dev,