Patch "usb: xhci: fix spinlock recursion for USB2 test mode" has been added to the 4.12-stable tree

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

usb: xhci: fix spinlock recursion for USB2 test mode

to the 4.12-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-xhci-fix-spinlock-recursion-for-usb2-test-mode.patch
and it can be found in the queue-4.12 subdirectory.

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

From: Peter Chen <[email protected]>
Date: Thu, 20 Jul 2017 14:48:30 +0300
Subject: usb: xhci: fix spinlock recursion for USB2 test mode

From: Peter Chen <[email protected]>

commit 576d55460e7f209139545a348746c2fcadf61bc3 upstream.

Both xhci_hub_control and xhci_disable_slot tries to hold spinlock, the spinlock recursion occurs when enters USB2 test mode. Fix it by unlock spinlock before calling xhci_disable_slot.

---
 drivers/usb/host/xhci-hub.c |    2 ++
 1 file changed, 2 insertions(+)

@@ -603,12 +603,14 @@ static int xhci_enter_test_mode(struct x
 
 	/* Disable all Device Slots */
 	xhci_dbg(xhci, "Disable all slots\n");
+	spin_unlock_irqrestore(&xhci->lock, *flags);
 	for (i = 1; i <= HCS_MAX_SLOTS(xhci->hcs_params1); i++) {
 		retval = xhci_disable_slot(xhci, NULL, i);
 		if (retval)
 			xhci_err(xhci, "Failed to disable slot %d, %d. Enter test mode anyway\n",
 				 i, retval);
 	}
+	spin_lock_irqsave(&xhci->lock, *flags);
 	/* Put all ports to the Disable state by clear PP */
 	xhci_dbg(xhci, "Disable all port (PP = 0)\n");
 	/* Power off USB3 ports*/

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

queue-4.12/usb-xhci-fix-spinlock-recursion-for-usb2-test-mode.patch