usb: xhci: lock mutex on xhci_stop
Else it races with xhci_setup_device Cc: <stable@vger.kernel.org> Signed-off-by: Roger Quadros <rogerq@ti.com> Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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