xhci: fix xhci debugfs errors in xhci_stop

In function xhci_stop, xhci_debugfs_exit called before xhci_mem_cleanup.
xhci_debugfs_exit removed the xhci debugfs root nodes, xhci_mem_cleanup
called function xhci_free_virt_devices_depth_first which in turn called
function xhci_debugfs_remove_slot.
Function xhci_debugfs_remove_slot removed the nodes for devices, the nodes
folders are sub folder of xhci debugfs.

It is unreasonable to remove xhci debugfs root folder before
xhci debugfs sub folder. Function xhci_mem_cleanup should be called
before function xhci_debugfs_exit.

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>

diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index 4adb6da0bd38f8e6f70d88fa72c8ada79387d523..25d4b748a56f3f4a5e3d29a55e853571195fc014 100644 (file)
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -646,8 +646,6 @@ static void xhci_stop(struct usb_hcd *hcd)
                return;
        }
 
-       xhci_debugfs_exit(xhci);
-
        xhci_dbc_exit(xhci);
 
        spin_lock_irq(&xhci->lock);
@@ -680,6 +678,7 @@ static void xhci_stop(struct usb_hcd *hcd)
 
        xhci_dbg_trace(xhci, trace_xhci_dbg_init, "cleaning up memory");
        xhci_mem_cleanup(xhci);
+       xhci_debugfs_exit(xhci);
        xhci_dbg_trace(xhci, trace_xhci_dbg_init,
                        "xhci_stop completed - status = %x",
                        readl(&xhci->op_regs->status));