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Commit 164be0a8 authored by Greg Kroah-Hartman's avatar Greg Kroah-Hartman
Browse files

Revert "usb: cdc-wdm: close race between read and workqueue" 

commit 1607830dadeefc407e4956336d9fcd9e9defd810 upstream.

This reverts commit 339f83612f3a569b194680768b22bf113c26a29d.

It has been found to cause problems in a number of Chromebook devices,
so revert the change until it can be brought back in a safe way.

Link: https://lore.kernel.org/r/385a3519-b45d-48c5-a6fd-a3fdb6bec92f@chromium.org


Reported-by: default avatar: Aleksander Morgado <aleksandermj@chromium.org>
Fixes: 339f83612f3a ("usb: cdc-wdm: close race between read and workqueue")
Cc: stable <stable@kernel.org>
Cc: Oliver Neukum <oneukum@suse.com>
Cc: Bjørn Mork <bjorn@mork.no>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 11a3e5c7

drivers/usb/class/cdc-wdm.c

+1 −5
Original line number Diff line number Diff line
@@ -471,7 +471,6 @@ static ssize_t wdm_write 
static int service_outstanding_interrupt(struct wdm_device *desc)

{

	int rv = 0;

	int used;



	/* submit read urb only if the device is waiting for it */

	if (!desc->resp_count || !--desc->resp_count)
@@ -486,10 +485,7 @@ static int service_outstanding_interrupt(struct wdm_device *desc) 
		goto out;

	}



	used = test_and_set_bit(WDM_RESPONDING, &desc->flags);

	if (used)

		goto out;



	set_bit(WDM_RESPONDING, &desc->flags);

	spin_unlock_irq(&desc->iuspin);

	rv = usb_submit_urb(desc->response, GFP_KERNEL);

	spin_lock_irq(&desc->iuspin);