[alsa-devel] [PATCH] usb: add USB_QUIRK_RESET_RESUME for M-Audio 49

[Oliver Neukum]

On Monday 26 November 2012 14:43:13 Clemens Ladisch wrote:

> > If it has to be running, the easiest fix would be the patch like
> > below.  This will turn off the autopm essentially, but better than
> > breakage.
> >
> > @@ -2074,6 +2077,8 @@ static void snd_usbmidi_input_start_ep(struct snd_usb_midi_in_endpoint* ep)
> >
> > +	ep->autopm_reference =
> > +		usb_autopm_get_interface(ep->umidi->iface) >= 0;
> 
> usb_autopm_get_interface() cannot be called from the USB probe callback.

You can use usb_autopm_get_interface_no_resume()
During probe() the device is known to not be suspended.

	Regards
		Oliver