4.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Peter Chen <peter.chen@xxxxxxx> 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. Fixes: 0f1d832ed1fb ("usb: xhci: Add port test modes support for usb2") Signed-off-by: Peter Chen <peter.chen@xxxxxxx> Signed-off-by: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/usb/host/xhci-hub.c | 2 ++ 1 file changed, 2 insertions(+) --- a/drivers/usb/host/xhci-hub.c +++ b/drivers/usb/host/xhci-hub.c @@ -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*/