Re: [PATCH v2 1/2] media: sunxi: Fix some error handling path of sun8i_a83t_mipi_csi2_probe()

[Paul Kocialkowski]

Hi Christophe,

On Tue 23 Aug 22, 09:42, 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.

Looks good to me, thanks!

Acked-by: Paul Kocialkowski <paul.kocialkowski@xxxxxxxxxxx>

> Fixes: 576d196c522b ("media: sunxi: Add support for the A83T MIPI CSI-2 controller")
> Signed-off-by: Christophe JAILLET <christophe.jaillet@xxxxxxxxxx>
> ---
> 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.

Actually it's a legitimate call. The d-phy is internal on A83T and it's
registered in sun8i_a83t_dphy_register, which is called from
sun8i_a83t_mipi_csi2_resources_setup.

Cheers,

Paul

> Changes in v2:
>   * add some blank line   [Paul Kocialkowski <paul.kocialkowski@xxxxxxxxxxx>]
>   * rename the new labels   [Paul Kocialkowski <paul.kocialkowski@xxxxxxxxxxx>]
> 
> v1:
>   https://lore.kernel.org/all/62c0aef8d3b86d8f290bf6787f1b2b41efbb0b55.1659295329.git.christophe.jaillet@xxxxxxxxxx/
> ---
>  .../sun8i_a83t_mipi_csi2.c                    | 23 +++++++++++++++----
>  1 file changed, 18 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..b032ec13a683 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 error_clock_rate_exclusive;
>  	}
>  
>  	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 error_clock_rate_exclusive;
>  	}
>  
>  	/* 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 error_clock_rate_exclusive;
>  	}
>  
>  	/* 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 error_clock_rate_exclusive;
>  	}
>  
>  	/* Runtime PM */
> @@ -749,6 +752,11 @@ sun8i_a83t_mipi_csi2_resources_setup(struct sun8i_a83t_mipi_csi2_device *csi2_de
>  	pm_runtime_enable(dev);
>  
>  	return 0;
> +
> +error_clock_rate_exclusive:
> +	clk_rate_exclusive_put(csi2_dev->clock_mod);
> +
> +	return ret;
>  }
>  
>  static void
> @@ -778,9 +786,14 @@ 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 error_resources;
>  
>  	return 0;
> +
> +error_resources:
> +	sun8i_a83t_mipi_csi2_resources_cleanup(csi2_dev);
> +
> +	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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