3.14-stable review patch. If anyone has any objections, please let me know.
------------------ From: Zhuang Jin Can <jin.can.zhu...@intel.com> commit aca3a0489ac019b58cf32794d5362bb284cb9b94 upstream. Port link change with port in resume state should not be reported to usbcore, as this is an internal state to be handled by xhci driver. Reporting PLC to usbcore may cause usbcore clearing PLC first and port change event irq won't be generated. Signed-off-by: Zhuang Jin Can <jin.can.zhu...@intel.com> Signed-off-by: Mathias Nyman <mathias.ny...@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org> --- drivers/usb/host/xhci-hub.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) --- a/drivers/usb/host/xhci-hub.c +++ b/drivers/usb/host/xhci-hub.c @@ -587,7 +587,14 @@ static u32 xhci_get_port_status(struct u status |= USB_PORT_STAT_C_RESET << 16; /* USB3.0 only */ if (hcd->speed == HCD_USB3) { - if ((raw_port_status & PORT_PLC)) + /* Port link change with port in resume state should not be + * reported to usbcore, as this is an internal state to be + * handled by xhci driver. Reporting PLC to usbcore may + * cause usbcore clearing PLC first and port change event + * irq won't be generated. + */ + if ((raw_port_status & PORT_PLC) && + (raw_port_status & PORT_PLS_MASK) != XDEV_RESUME) status |= USB_PORT_STAT_C_LINK_STATE << 16; if ((raw_port_status & PORT_WRC)) status |= USB_PORT_STAT_C_BH_RESET << 16; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/