3.16.61-rc1 review patch. If anyone has any objections, please let me know.
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From: Bin Liu b-liu@ti.com
commit 249a32b7eeb3edb6897dd38f89651a62163ac4ed upstream.
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") 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 [bwh: Backported to 3.16: adjust context] Signed-off-by: Ben Hutchings ben@decadent.org.uk --- drivers/usb/core/hub.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-)
--- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -1119,10 +1119,14 @@ static void hub_activate(struct usb_hub
if (!udev || udev->state == USB_STATE_NOTATTACHED) { /* Tell khubd 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) {