Hi Oliver,

On Wed, Nov 25, 2009 at 05:57:16PM +0100, Oliver Neukum wrote:

Hi,

I need a way to determine whether an input device has been opened.
A private flag seems wasteful. Is this an acceptable method?

Yes, I thhink it is reasonable. I really don't think that adding a
wrapper for input->mutex worth it but I would not oppose adding one
either.

	Regards
		Oliver

+static int usbtouch_resume(struct usb_interface *intf)
+{
+       struct usbtouch_usb *usbtouch = usb_get_intfdata(intf);
+       struct input_dev *input = usbtouch->input;
+       int result = 0;
+
+       mutex_lock(&input->mutex);
+       if (input->users)
+               result = usb_submit_urb(usbtouch->irq, GFP_NOIO);
+       mutex_unlock(&input->mutex);
+       return result;
+}

-- 
Dmitry