[PATCH 2/2] ASoC: rt711: wait for the delayed work to finish when the system suspends

[Pierre-Louis Bossart]

On 9/21/20 4:43 AM, shumingf at realtek.com wrote:
> From: Shuming Fan <shumingf at realtek.com>
> 
> To avoid the IO error, we need to cancel the delayed work and wait for it to finish.
> 
> Signed-off-by: Shuming Fan <shumingf at realtek.com>

Thanks Shuming.

For more context we detected a timeout error during suspend-resume 
stress tests, the problem is similar to an earlier case with interrupt 
handling already fixed in the SoundWire tree: we want all workqueues to 
complete before suspending.

BugLink: https://github.com/thesofproject/linux/issues/2443
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>

> ---
>   sound/soc/codecs/rt711-sdw.c | 4 ++++
>   1 file changed, 4 insertions(+)
> 
> diff --git a/sound/soc/codecs/rt711-sdw.c b/sound/soc/codecs/rt711-sdw.c
> index 28d663673320..3a8ca600d1cf 100644
> --- a/sound/soc/codecs/rt711-sdw.c
> +++ b/sound/soc/codecs/rt711-sdw.c
> @@ -491,6 +491,10 @@ static int __maybe_unused rt711_dev_suspend(struct device *dev)
>   	if (!rt711->hw_init)
>   		return 0;
>   
> +	cancel_delayed_work_sync(&rt711->jack_detect_work);
> +	cancel_delayed_work_sync(&rt711->jack_btn_check_work);
> +	cancel_work_sync(&rt711->calibration_work);
> +
>   	regcache_cache_only(rt711->regmap, true);
>   
>   	return 0;
>