[alsa-devel] [PATCH 3/3] ALSA: HDA: wait for RIRB, CORB DMA to finish

[Vinod Koul]

On Tue, Aug 04, 2015 at 07:13:12AM +0200, Takashi Iwai wrote:
> > @@ -86,10 +86,24 @@ EXPORT_SYMBOL_GPL(snd_hdac_bus_init_cmd_io);
> >   */
> >  void snd_hdac_bus_stop_cmd_io(struct hdac_bus *bus)
> >  {
> > +	unsigned long timeout;
> > +
> >  	spin_lock_irq(&bus->reg_lock);
> >  	/* disable ringbuffer DMAs */
> >  	snd_hdac_chip_writeb(bus, RIRBCTL, 0);
> >  	snd_hdac_chip_writeb(bus, CORBCTL, 0);
> > +
> > +	/* poll DMAs to check if they stopped or not */
> > +
> > +	timeout = jiffies + msecs_to_jiffies(100);
> > +	while ((snd_hdac_chip_readb(bus, RIRBCTL) & AZX_RBCTL_DMA_EN) &&
> > +	       time_before(jiffies, timeout))
> > +		usleep_range(500, 1000);
> 
> You must not use *sleep() inside atomic context.
Right, not sure why it didnt crib when we tested, will send updated one soon

Thanks for the super quick review :)

-- 
~Vinod