linux-kernel - RE: [PATCH 5/8] media: rzg2l-cru: csi2: Use temporary variable for struct device in rzg2l_csi2

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Message-ID:
 <TY3PR01MB113468D351D5985DE8F9C4B5586F22@TY3PR01MB11346.jpnprd01.prod.outlook.com>
Date: Mon, 10 Feb 2025 11:55:47 +0000
From: Biju Das <biju.das.jz@...renesas.com>
To: Tommaso Merciai <tomm.merciai@...il.com>, Tommaso Merciai
	<tomm.merciai@...il.com>
CC: "linux-renesas-soc@...r.kernel.org" <linux-renesas-soc@...r.kernel.org>,
	"linux-media@...r.kernel.org" <linux-media@...r.kernel.org>, Prabhakar
 Mahadev Lad <prabhakar.mahadev-lad.rj@...renesas.com>, Tommaso Merciai
	<tommaso.merciai.xr@...renesas.com>, Mauro Carvalho Chehab
	<mchehab@...nel.org>, Rob Herring <robh@...nel.org>, Krzysztof Kozlowski
	<krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, Philipp Zabel
	<p.zabel@...gutronix.de>, Geert Uytterhoeven <geert+renesas@...der.be>,
	Magnus Damm <magnus.damm@...il.com>, Laurent Pinchart
	<laurent.pinchart+renesas@...asonboard.com>, Hans Verkuil
	<hverkuil@...all.nl>, Uwe Kleine-König
	<u.kleine-koenig@...libre.com>, "devicetree@...r.kernel.org"
	<devicetree@...r.kernel.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 5/8] media: rzg2l-cru: csi2: Use temporary variable for
 struct device in rzg2l_csi2_probe()

Hi Tommaso Merciai,

> -----Original Message-----
> From: Tommaso Merciai <tomm.merciai@...il.com>
> Sent: 10 February 2025 11:46
> Subject: [PATCH 5/8] media: rzg2l-cru: csi2: Use temporary variable for struct device in
> rzg2l_csi2_probe()
> 
> From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> 
> Use a temporary variable for the struct device pointers to avoid dereferencing.
> 
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> Signed-off-by: Tommaso Merciai <tommaso.merciai.xr@...renesas.com>

Reviewed-by: Biju Das <biju.das.jz@...renesas.com>

Cheers,
Biju

> ---
>  .../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