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    Subject[31/53] usb, xhci: Clear warm reset change event during init
    3.1-stable review patch.  If anyone has any objections, please let me know.


    From: Don Zickus <>

    commit 79c3dd8150fd5236d95766a9e662e3e932b462c9 upstream.

    I noticed on my Panther Point system that I wasn't getting hotplug events
    for my usb3.0 disk on a usb3 port. I tracked it down to the fact that the
    system had the warm reset change bit still set. This seemed to block future
    events from being received, including a hotplug event.

    Clearing this bit during initialization allowed the hotplug event to be
    received and the disk to be recognized correctly.

    This patch should be backported to kernels as old as 2.6.39.

    Signed-off-by: Don Zickus <>
    Signed-off-by: Sarah Sharp <>
    Signed-off-by: Greg Kroah-Hartman <>

    drivers/usb/core/hub.c | 6 ++++++
    1 file changed, 6 insertions(+)

    --- a/drivers/usb/core/hub.c
    +++ b/drivers/usb/core/hub.c
    @@ -813,6 +813,12 @@ static void hub_activate(struct usb_hub

    + if ((portchange & USB_PORT_STAT_C_BH_RESET) &&
    + hub_is_superspeed(hub->hdev)) {
    + need_debounce_delay = true;
    + clear_port_feature(hub->hdev, port1,
    + }
    /* We can forget about a "removed" device when there's a
    * physical disconnect or the connect status changes.

     \ /
      Last update: 2011-11-23 01:39    [W:0.024 / U:6.436 seconds]
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