On Tue, Nov 04, 2014 at 10:46:11AM +0800, Peter Chen wrote:
> It is safe to call notify disconnect when the usb core
> thinks the device is disconnected.
>
> This commit also fixes one bug found at below situation:
> we have not enabled usb wakeup, we do system suspend when
> there is an usb device at the port, after suspend, we plug out
> the usb device, then plug in device again. At that time,
> the nofity disconnect was not called at current code, as
> the controller doesn't know the usb device was disconnected
> during the suspend, but USB core knows the port has changed
> during that periods.
>
> So to fix this problem, and let the usb core call notify disconnect.
>
> Cc: 3.17+ <stable@xxxxxxxxxxxxxxx>
> Signed-off-by: Peter Chen <peter.chen@xxxxxxxxxxxxx>
> ---
>
> Changes for v2:
> - Rebase on the newest usb-linus, and change "hcd->phy" to "hcd->usb_phy".
>
> drivers/usb/core/hub.c | 5 ++---
> 1 file changed, 2 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
> index 65a8e50..00912a5 100644
> --- a/drivers/usb/core/hub.c
> +++ b/drivers/usb/core/hub.c
> @@ -4624,9 +4624,8 @@ static void hub_port_connect(struct usb_hub *hub, int port1, u16 portstatus,
>
> /* Disconnect any existing devices under this port */
> if (udev) {
> - if (hcd->usb_phy && !hdev->parent &&
> - !(portstatus & USB_PORT_STAT_CONNECTION))
> - usb_phy_notify_disconnect(hcd->usb_phy, udev->speed);
> + if (hcd->phy && !hdev->parent)
Why is this now hcd->phy and not hcd->usb_phy?
Did you test this?
And why does it need to go to stable? Who has reported problems with
this?
thanks,
greg k-h
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