Re: [PATCH 4/5] drm/msm/dpu: Change _dpu_crtc_power_enable to void

[Sean Paul <sean-p7yTbzM4H96eqtR555YLDQ@public.gmane.org>]

On Wed, Sep 19, 2018 at 11:44:14AM -0400, Bruce Wang wrote:
> All checks for _dpu_crtc_power_enable are not true, so the function
> can never return an error code. All calls of the function have also
> been changed so that they don't expect a return value.
> 
> Signed-off-by: Bruce Wang <bzwang@chromium.org>
> ---
>  drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c | 35 ++++--------------------
>  1 file changed, 5 insertions(+), 30 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> index 017d16131dac..f0b52281c46f 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> @@ -60,37 +60,16 @@ static inline struct dpu_kms *_dpu_crtc_get_kms(struct drm_crtc *crtc)
>  	return to_dpu_kms(priv->kms);
>  }
>  
> -static inline int _dpu_crtc_power_enable(struct dpu_crtc *dpu_crtc, bool enable)
> +static inline void _dpu_crtc_power_enable(struct dpu_crtc *dpu_crtc, bool enable)
>  {
> -	struct drm_crtc *crtc;
> -	struct msm_drm_private *priv;
> -	struct dpu_kms *dpu_kms;
> -
> -	if (!dpu_crtc) {
> -		DPU_ERROR("invalid dpu crtc\n");
> -		return -EINVAL;
> -	}
> -
> -	crtc = &dpu_crtc->base;
> -	if (!crtc->dev || !crtc->dev->dev_private) {
> -		DPU_ERROR("invalid drm device\n");
> -		return -EINVAL;
> -	}
> -
> -	priv = crtc->dev->dev_private;
> -	if (!priv->kms) {
> -		DPU_ERROR("invalid kms\n");
> -		return -EINVAL;
> -	}
> -
> -	dpu_kms = to_dpu_kms(priv->kms);
> +	struct drm_crtc *crtc = &dpu_crtc->base;
> +	struct msm_drm_private *priv = crtc->dev->dev_private;
> +	struct dpu_kms *dpu_kms = to_dpu_kms(priv->kms);
>  
>  	if (enable)
>  		pm_runtime_get_sync(&dpu_kms->pdev->dev);
>  	else
>  		pm_runtime_put_sync(&dpu_kms->pdev->dev);
> -
> -	return 0;
>  }
>  
>  static void dpu_crtc_destroy(struct drm_crtc *crtc)
> @@ -849,14 +828,10 @@ static int _dpu_crtc_vblank_enable_no_lock(

I think this can go to void now too since the if (!dpu_crtc) check at the top is
a no-op.

This is a good thing, too since this function is only called from void functions
with one exception where its return value isn't passed on!

Sean

>  	dev = crtc->dev;
>  
>  	if (enable) {
> -		int ret;
> -
>  		/* drop lock since power crtc cb may try to re-acquire lock */
>  		mutex_unlock(&dpu_crtc->crtc_lock);
> -		ret = _dpu_crtc_power_enable(dpu_crtc, true);
> +		_dpu_crtc_power_enable(dpu_crtc, true);
>  		mutex_lock(&dpu_crtc->crtc_lock);
> -		if (ret)
> -			return ret;
>  
>  		list_for_each_entry(enc, &dev->mode_config.encoder_list, head) {
>  			if (enc->crtc != crtc)
> -- 
> 2.19.0.397.gdd90340f6a-goog
> 

-- 
Sean Paul, Software Engineer, Google / Chromium OS
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