Messages in this thread | | | Date | Thu, 13 Nov 2014 15:41:43 -0500 (EST) | From | Alan Stern <> | Subject | Re: [PATCH] HID: usbhid: get/put around clearing needs_remote_wakeup |
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On Thu, 13 Nov 2014, Benson Leung wrote:
> usbhid->intf->needs_remote_wakeup is set when a device is > opened, and is cleared when a device is closed. > > When a usbhid device that does not support remote wake > ( i.e. !device_can_wakeup() ) is closed, we fail out of > autosuspend_check() because the autosuspend check is called > before the flag is cleared as a result of usb_kill_urb(usbhid->urbin); > > The result is that a device that may otherwise autosuspend will > fail to enter suspend again after all handles to it are closed. > > In usbhid_open, usb_autopm_get_interface is called > before setting the needs_remote_wakeup flag, and > usb_autopm_put_interface is called after hid_start_in. > > However, when the device is closed in usbhid_close, the same > protection isn't there when clearing needs_remote_wakeup. This will > add that to usbhid_close as well as usbhid_stop.
usbhid_stop probably doesn't need it. And it should be possible to fix usbhid_close more easily just by interchanging the two lines:
- usb_kill_urb(usbhid->urbin); usbhid->intf->needs_remote_wakeup = 0; + usb_kill_urb(usbhid->urbin);
Have you tried this?
Alan Stern
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