Patch "xhci: Fix xhci debugfs devices node disappearance after hibernation" has been added to the 4.15-stable tree

Patch "xhci: Fix xhci debugfs devices node disappearance after hibernation" has been added to the 4.15-stable tree

[gregkh]

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

    xhci: Fix xhci debugfs devices node disappearance after hibernation

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:
     xhci-fix-xhci-debugfs-devices-node-disappearance-after-hibernation.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 <stable@vger.kernel.org> know about it.


>From d91676717261578f429d3577dbe9154b26e8abf7 Mon Sep 17 00:00:00 2001
From: Zhengjun Xing <zhengjun.xing@linux.intel.com>
Date: Mon, 12 Feb 2018 14:24:49 +0200
Subject: xhci: Fix xhci debugfs devices node disappearance after hibernation

From: Zhengjun Xing <zhengjun.xing@linux.intel.com>

commit d91676717261578f429d3577dbe9154b26e8abf7 upstream.

During system resume from hibernation, xhci host is reset, all the
nodes in devices folder are removed in xhci_mem_cleanup function.
Later nodes in /sys/kernel/debug/usb/xhci/* are created again in
function xhci_run, but the nodes already exist, so the nodes still
keep the old ones, finally device nodes in xhci debugfs folder
/sys/kernel/debug/usb/xhci/*/devices/* are disappeared.

This fix removed xhci debugfs nodes before the nodes are re-created,
so all the nodes in xhci debugfs can be re-created successfully.

Fixes: 02b6fdc2a153 ("usb: xhci: Add debugfs interface for xHCI driver")
Cc: <stable@vger.kernel.org> # v4.15
Signed-off-by: Zhengjun Xing <zhengjun.xing@linux.intel.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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

--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -1018,6 +1018,7 @@ int xhci_resume(struct xhci_hcd *xhci, b
 
 		xhci_dbg(xhci, "cleaning up memory\n");
 		xhci_mem_cleanup(xhci);
+		xhci_debugfs_exit(xhci);
 		xhci_dbg(xhci, "xhci_stop completed - status = %x\n",
 			    readl(&xhci->op_regs->status));
 


Patches currently in stable-queue which might be from zhengjun.xing@linux.intel.com are

queue-4.15/xhci-fix-xhci-debugfs-devices-node-disappearance-after-hibernation.patch
queue-4.15/xhci-fix-xhci-debugfs-errors-in-xhci_stop.patch
queue-4.15/xhci-xhci-debugfs-device-nodes-weren-t-removed-after-device-plugged-out.patch
queue-4.15/xhci-fix-null-pointer-in-xhci-debugfs.patch