usb: core: handle hub C_PORT_OVER_CURRENT condition

Based on USB2.0 Spec Section 11.12.5,

  "If a hub has per-port power switching and per-port current limiting,
  an over-current on one port may still cause the power on another port
  to fall below specific minimums. In this case, the affected port is
  placed in the Power-Off state and C_PORT_OVER_CURRENT is set for the
  port, but PORT_OVER_CURRENT is not set."

so let's check C_PORT_OVER_CURRENT too for over current condition.

Fixes: 08d1dec6f405 ("usb:hub set hub->change_bits when over-current happens")
Cc: <stable@vger.kernel.org>
Tested-by: Alessandro Antenucci <antenucci@korg.it>
Signed-off-by: Bin Liu <b-liu@ti.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index fcae521..1fb2668 100644 (file)
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -1142,10 +1142,14 @@ static void hub_activate(struct usb_hub *hub, enum hub_activation_type type)
 
                if (!udev || udev->state == USB_STATE_NOTATTACHED) {
                        /* Tell hub_wq to disconnect the device or
-                        * check for a new connection
+                        * check for a new connection or over current condition.
+                        * Based on USB2.0 Spec Section 11.12.5,
+                        * C_PORT_OVER_CURRENT could be set while
+                        * PORT_OVER_CURRENT is not. So check for any of them.
                         */
                        if (udev || (portstatus & USB_PORT_STAT_CONNECTION) ||
-                           (portstatus & USB_PORT_STAT_OVERCURRENT))
+                           (portstatus & USB_PORT_STAT_OVERCURRENT) ||
+                           (portchange & USB_PORT_STAT_C_OVERCURRENT))
                                set_bit(port1, hub->change_bits);
 
                } else if (portstatus & USB_PORT_STAT_ENABLE) {