Patch "usb: dwc3: Fix lock-up on ID change during system suspend/resume" has been added to the 4.15-stable tree

This is a note to let you know that I've just added the patch titled

usb: dwc3: Fix lock-up on ID change during system suspend/resume

to the 4.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
usb-dwc3-fix-lock-up-on-id-change-during-system-suspend-resume.patch
and it can be found in the queue-4.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Roger Quadros <[email protected]>
Date: Tue, 27 Feb 2018 12:41:41 +0200
Subject: usb: dwc3: Fix lock-up on ID change during system suspend/resume

From: Roger Quadros <[email protected]>

commit 084a804e01205bcd74cd0849bc72cb5c88f8e648 upstream.

To reproduce the lock up do the following
- connect otg host adapter and a USB device to the dual-role port so that it is in host mode.
- suspend to mem.
- disconnect otg adapter.
- resume the system.

If we call dwc3_host_exit() before tasks are thawed xhci_plat_remove() seems to lock up at the second usb_remove_hcd() call.

To work around this we queue the _dwc3_set_mode() work on the system_freezable_wq.

---
 drivers/usb/dwc3/core.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

@@ -174,7 +174,7 @@ void dwc3_set_mode(struct dwc3 *dwc, u32
 	dwc->desired_dr_role = mode;
 	spin_unlock_irqrestore(&dwc->lock, flags);
 
-	queue_work(system_power_efficient_wq, &dwc->drd_work);
+	queue_work(system_freezable_wq, &dwc->drd_work);
 }
 
 u32 dwc3_core_fifo_space(struct dwc3_ep *dep, u8 type)

Patches currently in stable-queue which might be from [email protected] are

queue-4.15/usb-dwc3-fix-lock-up-on-id-change-during-system-suspend-resume.patch