linux-kernel - Re: [PATCH 1/2] media: sunxi: Fix some error handling path of sun8i_a83t_mipi_csi2

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Date:   Fri, 5 Aug 2022 16:10:28 +0200
From:   Paul Kocialkowski <paul.kocialkowski@...tlin.com>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Samuel Holland <samuel@...lland.org>,
        Maxime Ripard <mripard@...nel.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        linux-media@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-sunxi@...ts.linux.dev
Subject: Re: [PATCH 1/2] media: sunxi: Fix some error handling path of
 sun8i_a83t_mipi_csi2_probe()

Hi Christophe,

On Sun 31 Jul 22, 21:22, Christophe JAILLET wrote:
> Release some resources in the error handling path of the probe and of
> sun8i_a83t_mipi_csi2_resources_setup(), as already done in the remove
> function.

Great finds, thanks! Just some nitpick about the label names to make them
consistent with other labels (also from the sun6i-csi rework).
 
> Fixes: 576d196c522b ("media: sunxi: Add support for the A83T MIPI CSI-2 controller")
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> ---
> I'm unsure about the phy_exit() call in
> sun8i_a83t_mipi_csi2_resources_cleanup() because no explicit phy_init()
> call is performed.
> 
> The same code is in sun6i-mipi-csi2/sun6i_mipi_csi2.c, but in this driver
> phy_init() IS called.
> 
> I leave it as-is because I don't if it is an issue or not.
> My feeling is that it is a copy'n'paste error and that it should be
> removed.
> ---
>  .../sun8i_a83t_mipi_csi2.c                    | 21 ++++++++++++++-----
>  1 file changed, 16 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/media/platform/sunxi/sun8i-a83t-mipi-csi2/sun8i_a83t_mipi_csi2.c b/drivers/media/platform/sunxi/sun8i-a83t-mipi-csi2/sun8i_a83t_mipi_csi2.c
> index d052ee77ef0a..67c7475d5d10 100644
> --- a/drivers/media/platform/sunxi/sun8i-a83t-mipi-csi2/sun8i_a83t_mipi_csi2.c
> +++ b/drivers/media/platform/sunxi/sun8i-a83t-mipi-csi2/sun8i_a83t_mipi_csi2.c
> @@ -719,13 +719,15 @@ sun8i_a83t_mipi_csi2_resources_setup(struct sun8i_a83t_mipi_csi2_device *csi2_de
>  	csi2_dev->clock_mipi = devm_clk_get(dev, "mipi");
>  	if (IS_ERR(csi2_dev->clock_mipi)) {
>  		dev_err(dev, "failed to acquire mipi clock\n");
> -		return PTR_ERR(csi2_dev->clock_mipi);
> +		ret = PTR_ERR(csi2_dev->clock_mipi);
> +		goto err_put_clk_rate;
>  	}
>  
>  	csi2_dev->clock_misc = devm_clk_get(dev, "misc");
>  	if (IS_ERR(csi2_dev->clock_misc)) {
>  		dev_err(dev, "failed to acquire misc clock\n");
> -		return PTR_ERR(csi2_dev->clock_misc);
> +		ret = PTR_ERR(csi2_dev->clock_misc);
> +		goto err_put_clk_rate;
>  	}
>  
>  	/* Reset */
> @@ -733,7 +735,8 @@ sun8i_a83t_mipi_csi2_resources_setup(struct sun8i_a83t_mipi_csi2_device *csi2_de
>  	csi2_dev->reset = devm_reset_control_get_shared(dev, NULL);
>  	if (IS_ERR(csi2_dev->reset)) {
>  		dev_err(dev, "failed to get reset controller\n");
> -		return PTR_ERR(csi2_dev->reset);
> +		ret = PTR_ERR(csi2_dev->reset);
> +		goto err_put_clk_rate;
>  	}
>  
>  	/* D-PHY */
> @@ -741,7 +744,7 @@ sun8i_a83t_mipi_csi2_resources_setup(struct sun8i_a83t_mipi_csi2_device *csi2_de
>  	ret = sun8i_a83t_dphy_register(csi2_dev);
>  	if (ret) {
>  		dev_err(dev, "failed to initialize MIPI D-PHY\n");
> -		return ret;
> +		goto err_put_clk_rate;
>  	}
>  
>  	/* Runtime PM */
> @@ -749,6 +752,10 @@ sun8i_a83t_mipi_csi2_resources_setup(struct sun8i_a83t_mipi_csi2_device *csi2_de
>  	pm_runtime_enable(dev);
>  
>  	return 0;
> +
> +err_put_clk_rate:

Please call this "error_clock_rate_exclusive",

> +	clk_rate_exclusive_put(csi2_dev->clock_mod);

and add a blank line here.

> +	return ret;
>  }
>  
>  static void
> @@ -778,9 +785,13 @@ static int sun8i_a83t_mipi_csi2_probe(struct platform_device *platform_dev)
>  
>  	ret = sun8i_a83t_mipi_csi2_bridge_setup(csi2_dev);
>  	if (ret)
> -		return ret;
> +		goto err_cleanup_resources;
>  
>  	return 0;
> +
> +err_cleanup_resources:

Please call this "error_resources",

> +	sun8i_a83t_mipi_csi2_resources_cleanup(csi2_dev);

and add a blank line here.

Thanks!

Paul

> +	return ret;
>  }
>  
>  static int sun8i_a83t_mipi_csi2_remove(struct platform_device *platform_dev)
> -- 
> 2.34.1
> 

-- 
Paul Kocialkowski, Bootlin
Embedded Linux and kernel engineering
https://bootlin.com

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