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

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On Mon, 26 Nov 2012, Oliver Neukum wrote:

> 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.

In fact, as far as I know you _can_ use usb_autopm_get_interface() from
within a probe routine.  Is there some problem with it I'm not aware of?

Alan Stern

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