[PATCH 2/5] ASoC: Intel: bdw-rt5677: fix module load/unload issues

[Cezary Rojewski]

On 2020-06-22 5:42 PM, Pierre-Louis Bossart wrote:
> The mainline code currently prevents modules from being removed.
> 
> The BE dailink .init() function calls devm_gpiod_get() using the codec
> component device as argument. When the machine driver is removed, the
> references to the gpiod are not released, and it's not possible to
> remove the codec driver module - which is the only entity which could
> free the gpiod.
> 
> This conceptual deadlock can be avoided by invoking gpiod_get() in the
> .init() callback, and calling gpiod_put() in the exit() callback.
> 
> Tested on SAMUS Chromebook with SOF driver.
> 

As /intel/haswell is the go-to driver for BDW platforms, please test and 
confirm with legacy driver first. SOF is optional and thus non-blocking.

Czarek