[alsa-devel] [RFC PATCH 17/40] soundwire: bus: use runtime_pm_get_sync/pm when enabled

[Pierre-Louis Bossart]

On 7/30/19 6:21 AM, Andy Shevchenko wrote:
> On Mon, Jul 29, 2019 at 05:07:39PM -0500, Pierre-Louis Bossart wrote:
>> On 7/26/19 2:08 PM, Andy Shevchenko wrote:
>>> On Fri, Jul 26, 2019 at 01:08:57PM -0500, Pierre-Louis Bossart wrote:
> 
>>>> -	if (ret < 0)
>>>> +	if (ret < 0 && ret != -EACCES)
>>>
>>> ...and here, the pm_runtime_put_noidle() call is missed.
>>
>> yes but in the example you provided, they actually do more work than just
>> decrement the device usage counter:
> 
> In their case they would like to do that. You decide what is appropriate call
> in your case.
> 
> My point is, that reference counter in case of error handling should be
> returned back to its value.

Agree on the reference count.
I am however not clear on the next step and 'what is appropriate'.

If pm_runtime_get_sync() failed, then technically the device was not 
resumed so marking it as last_busy+autosuspend, or using a plain vanilla 
put() will not result in any action. I must be missing something here.