[alsa-devel] [PATCH 1/2] ASoC: rt5645: Fix missing free_irq

[Koro Chen]

On Wed, 2015-07-08 at 12:14 +0100, Mark Brown wrote:
> On Wed, Jul 08, 2015 at 04:25:50PM +0800, Koro Chen wrote:
> 
> > The driver does not free irq if snd_soc_register_codec fails.
> > It does not return error when request irq failed, either.
> > Fix this by using devm_request_threaded_irq(), and returns when error.
> 
> Unfortunately this isn't safe...
> 
> > -	if (i2c->irq)
> > -		free_irq(i2c->irq, rt5645);
> > -
> >  	cancel_delayed_work_sync(&rt5645->jack_detect_work);
> 
> This work item is queued up by the interrupt handler so we need to
> unregister the interrupt before we cancel any pending work otherwise
> it's possible that the interrupt may fire after we cancelled the work.
Thank you for seeing this, I didn't notice the delayed work.
Do you think I should use devm_request_threaded_irq(), and change
free_irq to devm_free_irq in remove? Or I should keep the original
request_thread_irq(), and just add a free_irq() during probe failed?