xhci: do not report PLC when link is in internal resume state

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.

Cc: <stable@vger.kernel.org>
Signed-off-by: Zhuang Jin Can <jin.can.zhuang@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-hub.c b/drivers/usb/host/xhci-hub.c
index fdca8ed..78241b5 100644 (file)
--- a/drivers/usb/host/xhci-hub.c
+++ b/drivers/usb/host/xhci-hub.c
@@ -591,7 +591,14 @@ static u32 xhci_get_port_status(struct usb_hcd *hcd,
                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;