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[PATCH 5/8] media: rzg2l-cru: csi2: Use temporary variable for struct device in rzg2l_csi2_probe()

Tommaso Merciai posted 8 patches 10 months, 1 week ago
[PATCH 5/8] media: rzg2l-cru: csi2: Use temporary variable for struct device in rzg2l_csi2_probe()
Posted by Tommaso Merciai 10 months, 1 week ago 
From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>

Use a temporary variable for the struct device pointers to avoid
dereferencing.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Signed-off-by: Tommaso Merciai <tommaso.merciai.xr@bp.renesas.com>
---
 .../platform/renesas/rzg2l-cru/rzg2l-csi2.c   | 31 ++++++++++---------
 1 file changed, 16 insertions(+), 15 deletions(-)

diff --git a/drivers/media/platform/renesas/rzg2l-cru/rzg2l-csi2.c b/drivers/media/platform/renesas/rzg2l-cru/rzg2l-csi2.c
index 881e910dce02..948f1917b830 100644
--- a/drivers/media/platform/renesas/rzg2l-cru/rzg2l-csi2.c
+++ b/drivers/media/platform/renesas/rzg2l-cru/rzg2l-csi2.c
@@ -764,10 +764,11 @@ static const struct media_entity_operations rzg2l_csi2_entity_ops = {
 
 static int rzg2l_csi2_probe(struct platform_device *pdev)
 {
+	struct device *dev = &pdev->dev;
 	struct rzg2l_csi2 *csi2;
 	int ret;
 
-	csi2 = devm_kzalloc(&pdev->dev, sizeof(*csi2), GFP_KERNEL);
+	csi2 = devm_kzalloc(dev, sizeof(*csi2), GFP_KERNEL);
 	if (!csi2)
 		return -ENOMEM;
 
@@ -775,28 +776,28 @@ static int rzg2l_csi2_probe(struct platform_device *pdev)
 	if (IS_ERR(csi2->base))
 		return PTR_ERR(csi2->base);
 
-	csi2->cmn_rstb = devm_reset_control_get_exclusive(&pdev->dev, "cmn-rstb");
+	csi2->cmn_rstb = devm_reset_control_get_exclusive(dev, "cmn-rstb");
 	if (IS_ERR(csi2->cmn_rstb))
-		return dev_err_probe(&pdev->dev, PTR_ERR(csi2->cmn_rstb),
+		return dev_err_probe(dev, PTR_ERR(csi2->cmn_rstb),
 				     "Failed to get cpg cmn-rstb\n");
 
-	csi2->presetn = devm_reset_control_get_shared(&pdev->dev, "presetn");
+	csi2->presetn = devm_reset_control_get_shared(dev, "presetn");
 	if (IS_ERR(csi2->presetn))
-		return dev_err_probe(&pdev->dev, PTR_ERR(csi2->presetn),
+		return dev_err_probe(dev, PTR_ERR(csi2->presetn),
 				     "Failed to get cpg presetn\n");
 
-	csi2->sysclk = devm_clk_get(&pdev->dev, "system");
+	csi2->sysclk = devm_clk_get(dev, "system");
 	if (IS_ERR(csi2->sysclk))
-		return dev_err_probe(&pdev->dev, PTR_ERR(csi2->sysclk),
+		return dev_err_probe(dev, PTR_ERR(csi2->sysclk),
 				     "Failed to get system clk\n");
 
-	csi2->vclk = devm_clk_get(&pdev->dev, "video");
+	csi2->vclk = devm_clk_get(dev, "video");
 	if (IS_ERR(csi2->vclk))
-		return dev_err_probe(&pdev->dev, PTR_ERR(csi2->vclk),
+		return dev_err_probe(dev, PTR_ERR(csi2->vclk),
 				     "Failed to get video clock\n");
 	csi2->vclk_rate = clk_get_rate(csi2->vclk);
 
-	csi2->dev = &pdev->dev;
+	csi2->dev = dev;
 
 	platform_set_drvdata(pdev, csi2);
 
@@ -804,18 +805,18 @@ static int rzg2l_csi2_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
-	pm_runtime_enable(&pdev->dev);
+	pm_runtime_enable(dev);
 
 	ret = rzg2l_validate_csi2_lanes(csi2);
 	if (ret)
 		goto error_pm;
 
-	csi2->subdev.dev = &pdev->dev;
+	csi2->subdev.dev = dev;
 	v4l2_subdev_init(&csi2->subdev, &rzg2l_csi2_subdev_ops);
 	csi2->subdev.internal_ops = &rzg2l_csi2_internal_ops;
-	v4l2_set_subdevdata(&csi2->subdev, &pdev->dev);
+	v4l2_set_subdevdata(&csi2->subdev, dev);
 	snprintf(csi2->subdev.name, sizeof(csi2->subdev.name),
-		 "csi-%s", dev_name(&pdev->dev));
+		 "csi-%s", dev_name(dev));
 	csi2->subdev.flags = V4L2_SUBDEV_FL_HAS_DEVNODE;
 
 	csi2->subdev.entity.function = MEDIA_ENT_F_VID_IF_BRIDGE;
@@ -852,7 +853,7 @@ static int rzg2l_csi2_probe(struct platform_device *pdev)
 	v4l2_async_nf_cleanup(&csi2->notifier);
 	media_entity_cleanup(&csi2->subdev.entity);
 error_pm:
-	pm_runtime_disable(&pdev->dev);
+	pm_runtime_disable(dev);
 
 	return ret;
 }
-- 
2.34.1
Re: [PATCH 5/8] media: rzg2l-cru: csi2: Use temporary variable for struct device in rzg2l_csi2_probe()
Posted by Laurent Pinchart 10 months ago 
Hi Tommaso, Prabhakar,

Thank you for the patch.

On Mon, Feb 10, 2025 at 12:45:37PM +0100, Tommaso Merciai wrote:
> From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> 
> Use a temporary variable for the struct device pointers to avoid

s/temporary/local/ (in the subject message too).

> dereferencing.

The only advantage of this is shortened lines. That's a coding style
preference, and I'm fine with this patch, but the commit message should
mention this, not "avoid dereferencing".

> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> Signed-off-by: Tommaso Merciai <tommaso.merciai.xr@bp.renesas.com>
> ---
>  .../platform/renesas/rzg2l-cru/rzg2l-csi2.c   | 31 ++++++++++---------
>  1 file changed, 16 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/media/platform/renesas/rzg2l-cru/rzg2l-csi2.c b/drivers/media/platform/renesas/rzg2l-cru/rzg2l-csi2.c
> index 881e910dce02..948f1917b830 100644
> --- a/drivers/media/platform/renesas/rzg2l-cru/rzg2l-csi2.c
> +++ b/drivers/media/platform/renesas/rzg2l-cru/rzg2l-csi2.c
> @@ -764,10 +764,11 @@ static const struct media_entity_operations rzg2l_csi2_entity_ops = {
>  
>  static int rzg2l_csi2_probe(struct platform_device *pdev)
>  {
> +	struct device *dev = &pdev->dev;
>  	struct rzg2l_csi2 *csi2;
>  	int ret;
>  
> -	csi2 = devm_kzalloc(&pdev->dev, sizeof(*csi2), GFP_KERNEL);
> +	csi2 = devm_kzalloc(dev, sizeof(*csi2), GFP_KERNEL);
>  	if (!csi2)
>  		return -ENOMEM;
>  
> @@ -775,28 +776,28 @@ static int rzg2l_csi2_probe(struct platform_device *pdev)
>  	if (IS_ERR(csi2->base))
>  		return PTR_ERR(csi2->base);
>  
> -	csi2->cmn_rstb = devm_reset_control_get_exclusive(&pdev->dev, "cmn-rstb");
> +	csi2->cmn_rstb = devm_reset_control_get_exclusive(dev, "cmn-rstb");
>  	if (IS_ERR(csi2->cmn_rstb))
> -		return dev_err_probe(&pdev->dev, PTR_ERR(csi2->cmn_rstb),
> +		return dev_err_probe(dev, PTR_ERR(csi2->cmn_rstb),
>  				     "Failed to get cpg cmn-rstb\n");
>  
> -	csi2->presetn = devm_reset_control_get_shared(&pdev->dev, "presetn");
> +	csi2->presetn = devm_reset_control_get_shared(dev, "presetn");
>  	if (IS_ERR(csi2->presetn))
> -		return dev_err_probe(&pdev->dev, PTR_ERR(csi2->presetn),
> +		return dev_err_probe(dev, PTR_ERR(csi2->presetn),
>  				     "Failed to get cpg presetn\n");
>  
> -	csi2->sysclk = devm_clk_get(&pdev->dev, "system");
> +	csi2->sysclk = devm_clk_get(dev, "system");
>  	if (IS_ERR(csi2->sysclk))
> -		return dev_err_probe(&pdev->dev, PTR_ERR(csi2->sysclk),
> +		return dev_err_probe(dev, PTR_ERR(csi2->sysclk),
>  				     "Failed to get system clk\n");
>  
> -	csi2->vclk = devm_clk_get(&pdev->dev, "video");
> +	csi2->vclk = devm_clk_get(dev, "video");
>  	if (IS_ERR(csi2->vclk))
> -		return dev_err_probe(&pdev->dev, PTR_ERR(csi2->vclk),
> +		return dev_err_probe(dev, PTR_ERR(csi2->vclk),
>  				     "Failed to get video clock\n");
>  	csi2->vclk_rate = clk_get_rate(csi2->vclk);
>  
> -	csi2->dev = &pdev->dev;
> +	csi2->dev = dev;
>  
>  	platform_set_drvdata(pdev, csi2);
>  
> @@ -804,18 +805,18 @@ static int rzg2l_csi2_probe(struct platform_device *pdev)
>  	if (ret)
>  		return ret;
>  
> -	pm_runtime_enable(&pdev->dev);
> +	pm_runtime_enable(dev);
>  
>  	ret = rzg2l_validate_csi2_lanes(csi2);
>  	if (ret)
>  		goto error_pm;
>  
> -	csi2->subdev.dev = &pdev->dev;
> +	csi2->subdev.dev = dev;
>  	v4l2_subdev_init(&csi2->subdev, &rzg2l_csi2_subdev_ops);
>  	csi2->subdev.internal_ops = &rzg2l_csi2_internal_ops;
> -	v4l2_set_subdevdata(&csi2->subdev, &pdev->dev);
> +	v4l2_set_subdevdata(&csi2->subdev, dev);
>  	snprintf(csi2->subdev.name, sizeof(csi2->subdev.name),
> -		 "csi-%s", dev_name(&pdev->dev));
> +		 "csi-%s", dev_name(dev));
>  	csi2->subdev.flags = V4L2_SUBDEV_FL_HAS_DEVNODE;
>  
>  	csi2->subdev.entity.function = MEDIA_ENT_F_VID_IF_BRIDGE;
> @@ -852,7 +853,7 @@ static int rzg2l_csi2_probe(struct platform_device *pdev)
>  	v4l2_async_nf_cleanup(&csi2->notifier);
>  	media_entity_cleanup(&csi2->subdev.entity);
>  error_pm:
> -	pm_runtime_disable(&pdev->dev);
> +	pm_runtime_disable(dev);
>  
>  	return ret;
>  }
> 

-- 
Regards,

Laurent Pinchart
Re: [PATCH 5/8] media: rzg2l-cru: csi2: Use temporary variable for struct device in rzg2l_csi2_probe()
Posted by Tommaso Merciai 10 months ago 
Hi Laurent,

Thanks for your review.

On Fri, Feb 14, 2025 at 02:47:29AM +0200, Laurent Pinchart wrote:
> Hi Tommaso, Prabhakar,
> 
> Thank you for the patch.
> 
> On Mon, Feb 10, 2025 at 12:45:37PM +0100, Tommaso Merciai wrote:
> > From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> > 
> > Use a temporary variable for the struct device pointers to avoid
> 
> s/temporary/local/ (in the subject message too).

I'll fix this in v2.
Thanks.

> 
> > dereferencing.
> 
> The only advantage of this is shortened lines. That's a coding style
> preference, and I'm fine with this patch, but the commit message should
> mention this, not "avoid dereferencing".

I will go for:

Use a local variable for the struct device pointers. This increases code
readability with shortened lines.

Thanks.
> 
> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> > Signed-off-by: Tommaso Merciai <tommaso.merciai.xr@bp.renesas.com>
> > ---
> >  .../platform/renesas/rzg2l-cru/rzg2l-csi2.c   | 31 ++++++++++---------
> >  1 file changed, 16 insertions(+), 15 deletions(-)
> > 
> > diff --git a/drivers/media/platform/renesas/rzg2l-cru/rzg2l-csi2.c b/drivers/media/platform/renesas/rzg2l-cru/rzg2l-csi2.c
> > index 881e910dce02..948f1917b830 100644
> > --- a/drivers/media/platform/renesas/rzg2l-cru/rzg2l-csi2.c
> > +++ b/drivers/media/platform/renesas/rzg2l-cru/rzg2l-csi2.c
> > @@ -764,10 +764,11 @@ static const struct media_entity_operations rzg2l_csi2_entity_ops = {
> >  
> >  static int rzg2l_csi2_probe(struct platform_device *pdev)
> >  {
> > +	struct device *dev = &pdev->dev;
> >  	struct rzg2l_csi2 *csi2;
> >  	int ret;
> >  
> > -	csi2 = devm_kzalloc(&pdev->dev, sizeof(*csi2), GFP_KERNEL);
> > +	csi2 = devm_kzalloc(dev, sizeof(*csi2), GFP_KERNEL);
> >  	if (!csi2)
> >  		return -ENOMEM;
> >  
> > @@ -775,28 +776,28 @@ static int rzg2l_csi2_probe(struct platform_device *pdev)
> >  	if (IS_ERR(csi2->base))
> >  		return PTR_ERR(csi2->base);
> >  
> > -	csi2->cmn_rstb = devm_reset_control_get_exclusive(&pdev->dev, "cmn-rstb");
> > +	csi2->cmn_rstb = devm_reset_control_get_exclusive(dev, "cmn-rstb");
> >  	if (IS_ERR(csi2->cmn_rstb))
> > -		return dev_err_probe(&pdev->dev, PTR_ERR(csi2->cmn_rstb),
> > +		return dev_err_probe(dev, PTR_ERR(csi2->cmn_rstb),
> >  				     "Failed to get cpg cmn-rstb\n");
> >  
> > -	csi2->presetn = devm_reset_control_get_shared(&pdev->dev, "presetn");
> > +	csi2->presetn = devm_reset_control_get_shared(dev, "presetn");
> >  	if (IS_ERR(csi2->presetn))
> > -		return dev_err_probe(&pdev->dev, PTR_ERR(csi2->presetn),
> > +		return dev_err_probe(dev, PTR_ERR(csi2->presetn),
> >  				     "Failed to get cpg presetn\n");
> >  
> > -	csi2->sysclk = devm_clk_get(&pdev->dev, "system");
> > +	csi2->sysclk = devm_clk_get(dev, "system");
> >  	if (IS_ERR(csi2->sysclk))
> > -		return dev_err_probe(&pdev->dev, PTR_ERR(csi2->sysclk),
> > +		return dev_err_probe(dev, PTR_ERR(csi2->sysclk),
> >  				     "Failed to get system clk\n");
> >  
> > -	csi2->vclk = devm_clk_get(&pdev->dev, "video");
> > +	csi2->vclk = devm_clk_get(dev, "video");
> >  	if (IS_ERR(csi2->vclk))
> > -		return dev_err_probe(&pdev->dev, PTR_ERR(csi2->vclk),
> > +		return dev_err_probe(dev, PTR_ERR(csi2->vclk),
> >  				     "Failed to get video clock\n");
> >  	csi2->vclk_rate = clk_get_rate(csi2->vclk);
> >  
> > -	csi2->dev = &pdev->dev;
> > +	csi2->dev = dev;
> >  
> >  	platform_set_drvdata(pdev, csi2);
> >  
> > @@ -804,18 +805,18 @@ static int rzg2l_csi2_probe(struct platform_device *pdev)
> >  	if (ret)
> >  		return ret;
> >  
> > -	pm_runtime_enable(&pdev->dev);
> > +	pm_runtime_enable(dev);
> >  
> >  	ret = rzg2l_validate_csi2_lanes(csi2);
> >  	if (ret)
> >  		goto error_pm;
> >  
> > -	csi2->subdev.dev = &pdev->dev;
> > +	csi2->subdev.dev = dev;
> >  	v4l2_subdev_init(&csi2->subdev, &rzg2l_csi2_subdev_ops);
> >  	csi2->subdev.internal_ops = &rzg2l_csi2_internal_ops;
> > -	v4l2_set_subdevdata(&csi2->subdev, &pdev->dev);
> > +	v4l2_set_subdevdata(&csi2->subdev, dev);
> >  	snprintf(csi2->subdev.name, sizeof(csi2->subdev.name),
> > -		 "csi-%s", dev_name(&pdev->dev));
> > +		 "csi-%s", dev_name(dev));
> >  	csi2->subdev.flags = V4L2_SUBDEV_FL_HAS_DEVNODE;
> >  
> >  	csi2->subdev.entity.function = MEDIA_ENT_F_VID_IF_BRIDGE;
> > @@ -852,7 +853,7 @@ static int rzg2l_csi2_probe(struct platform_device *pdev)
> >  	v4l2_async_nf_cleanup(&csi2->notifier);
> >  	media_entity_cleanup(&csi2->subdev.entity);
> >  error_pm:
> > -	pm_runtime_disable(&pdev->dev);
> > +	pm_runtime_disable(dev);
> >  
> >  	return ret;
> >  }
> > 
> 
> -- 
> Regards,
> 
> Laurent Pinchart

Thanks & Regards,
Tommaso

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