[PATCH] drm/vc4: fix ref count leak in vc4_dsi_encoder_enable

[Markus Elfring]

> in vc4_dsi_encoder_enable, the call to pm_runtime_get_sync increments
> the counter even in case of failure, leading to incorrect
> ref count. In case of failure, decrement the ref count before returning.

* Can the term “reference count” become relevant also for this commit message
  besides other possible adjustments?

* Can it be nicer to combine proposed updates for this software module
  as a patch series (with a cover letter)?

* Would you like to add the tag “Fixes”?


…
> +++ b/drivers/gpu/drm/vc4/vc4_dsi.c
…
> @@ -1088,6 +1088,8 @@  static void vc4_dsi_encoder_enable(struct drm_encoder *encoder)
>  		dev_info(&dsi->pdev->dev, "DSI regs after:\n");
>  		drm_print_regset32(&p, &dsi->regset);
>  	}
> +out:
> +	pm_runtime_put(dev);
>  }
…

* Perhaps use the label “put_runtime” instead?

* Do you propose to perform an additional function call always
  (and not only according to failure cases)?

* How do you think about calling the function “pm_runtime_put_noidle”?

Regards,
Markus