Patch "usb: host: xhci-plat: Fix timeout on removal of hot pluggable xhci controllers" has been added to the 4.4-stable tree

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

usb: host: xhci-plat: Fix timeout on removal of hot pluggable xhci controllers

to the 4.4-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-host-xhci-plat-fix-timeout-on-removal-of-hot-pluggable-xhci-controllers.patch
and it can be found in the queue-4.4 subdirectory.

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

From: Guenter Roeck <[email protected]>
Date: Thu, 9 Mar 2017 15:39:37 +0200
Subject: usb: host: xhci-plat: Fix timeout on removal of hot pluggable xhci controllers

From: Guenter Roeck <[email protected]>

commit dcc7620cad5ad1326a78f4031a7bf4f0e5b42984 upstream.

Upstream commit 98d74f9ceaef ("xhci: fix 10 second timeout on removal of PCI hotpluggable xhci controllers") fixes a problem with hot pluggable PCI xhci controllers which can result in excessive timeouts, to the point where the system reports a deadlock.

The same problem is seen with hot pluggable xhci controllers using the xhci-plat driver, such as the driver used for Type-C ports on rk3399. Similar to hot-pluggable PCI controllers, the driver for this chip removes the xhci controller from the system when the Type-C cable is disconnected.

The solution for PCI devices works just as well for non-PCI devices and avoids the problem.

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

@@ -213,6 +213,8 @@ static int xhci_plat_remove(struct platf
 	struct xhci_hcd	*xhci = hcd_to_xhci(hcd);
 	struct clk *clk = xhci->clk;
 
+	xhci->xhc_state |= XHCI_STATE_REMOVING;
+
 	usb_remove_hcd(xhci->shared_hcd);
 	usb_phy_shutdown(hcd->usb_phy);
 

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

queue-4.4/usb-host-xhci-plat-fix-timeout-on-removal-of-hot-pluggable-xhci-controllers.patch