Re: Fwd: autosuspend for appletouch driver

[Oliver Neukum <oliver@neukum.org>]

Am Donnerstag 27 September 2007 schrieb Alan Stern:
> On Thu, 27 Sep 2007, Oliver Neukum wrote:
> 
> > @@ -528,12 +537,20 @@ exit:
> >  static int atp_open(struct input_dev *input)
> >  {
> >  	struct atp *dev = input_get_drvdata(input);
> > +	int rv = 0;
> >  
> > -	if (usb_submit_urb(dev->urb, GFP_ATOMIC))
> > +	if (usb_autopm_get_interface(dev->intf) < 0)
> >  		return -EIO;
> > +	dev->intf->needs_remote_wakeup = 1;
> > +	if (usb_submit_urb(dev->urb, GFP_KERNEL)) {
> > +		rv = -EIO;
> > +		dev->intf->needs_remote_wakeup = 0;
> > +		goto err;
> >  
> >  	dev->open = 1;
> > -	return 0;
> > +err:
> > +	usb_autopm_put_interface(dev->intf);
> > +	return rv;
> >  }
> >  
> >  static void atp_close(struct input_dev *input)
> > @@ -543,6 +560,7 @@ static void atp_close(struct input_dev *
> >  	usb_kill_urb(dev->urb);
> >  	cancel_work_sync(&dev->work);
> >  	dev->open = 0;
> > +	dev->intf->needs_remote_wakeup = 0;
> >  }
> 
> Doesn't atp_close() need to call usb_autopm_put_interface(), to balance 
> the usb_autopm_get_interface() call in atp_open()?

No, the get is balanced in atp_open() itself. The patch uses the last_busy
mechanism the same way the version for generic hid does. In fact, it is
only necessary because there's no nice API call for setting
needs_remote_wakeup.

	Regards
		Oliver

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