[PATCH 35/53] drm/panel: Convert to platform remove callback returning void

[Laurent Pinchart]

Hi Uwe,

Thank you for the patch.

On Sun, May 07, 2023 at 06:25:58PM +0200, Uwe Kleine-König wrote:
> The .remove() callback for a platform driver returns an int which makes
> many driver authors wrongly assume it's possible to do error handling by
> returning an error code. However the value returned is (mostly) ignored
> and this typically results in resource leaks. To improve here there is a
> quest to make the remove callback return void. In the first step of this
> quest all drivers are converted to .remove_new() which already returns
> void.
> 
> Trivially convert the drm panel drivers from always returning zero in the
> remove callback to the void returning variant.
> 
> Signed-off-by: Uwe Kleine-König <u.kleine-koenig at pengutronix.de>

Reviewed-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>

> ---
>  drivers/gpu/drm/panel/panel-lvds.c              | 6 ++----
>  drivers/gpu/drm/panel/panel-seiko-43wvf1g.c     | 6 ++----
>  drivers/gpu/drm/panel/panel-sharp-ls037v7dw01.c | 6 ++----
>  drivers/gpu/drm/panel/panel-simple.c            | 6 ++----
>  4 files changed, 8 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/gpu/drm/panel/panel-lvds.c b/drivers/gpu/drm/panel/panel-lvds.c
> index de8758c30e6e..b47c3a679be0 100644
> --- a/drivers/gpu/drm/panel/panel-lvds.c
> +++ b/drivers/gpu/drm/panel/panel-lvds.c
> @@ -228,15 +228,13 @@ static int panel_lvds_probe(struct platform_device *pdev)
>  	return 0;
>  }
>  
> -static int panel_lvds_remove(struct platform_device *pdev)
> +static void panel_lvds_remove(struct platform_device *pdev)
>  {
>  	struct panel_lvds *lvds = platform_get_drvdata(pdev);
>  
>  	drm_panel_remove(&lvds->panel);
>  
>  	drm_panel_disable(&lvds->panel);
> -
> -	return 0;
>  }
>  
>  static const struct of_device_id panel_lvds_of_table[] = {
> @@ -248,7 +246,7 @@ MODULE_DEVICE_TABLE(of, panel_lvds_of_table);
>  
>  static struct platform_driver panel_lvds_driver = {
>  	.probe		= panel_lvds_probe,
> -	.remove		= panel_lvds_remove,
> +	.remove_new	= panel_lvds_remove,
>  	.driver		= {
>  		.name	= "panel-lvds",
>  		.of_match_table = panel_lvds_of_table,
> diff --git a/drivers/gpu/drm/panel/panel-seiko-43wvf1g.c b/drivers/gpu/drm/panel/panel-seiko-43wvf1g.c
> index 76160e5d43bd..5c3d9f7fc358 100644
> --- a/drivers/gpu/drm/panel/panel-seiko-43wvf1g.c
> +++ b/drivers/gpu/drm/panel/panel-seiko-43wvf1g.c
> @@ -266,14 +266,12 @@ static int seiko_panel_probe(struct device *dev,
>  	return 0;
>  }
>  
> -static int seiko_panel_remove(struct platform_device *pdev)
> +static void seiko_panel_remove(struct platform_device *pdev)
>  {
>  	struct seiko_panel *panel = platform_get_drvdata(pdev);
>  
>  	drm_panel_remove(&panel->base);
>  	drm_panel_disable(&panel->base);
> -
> -	return 0;
>  }
>  
>  static void seiko_panel_shutdown(struct platform_device *pdev)
> @@ -335,7 +333,7 @@ static struct platform_driver seiko_panel_platform_driver = {
>  		.of_match_table = platform_of_match,
>  	},
>  	.probe = seiko_panel_platform_probe,
> -	.remove = seiko_panel_remove,
> +	.remove_new = seiko_panel_remove,
>  	.shutdown = seiko_panel_shutdown,
>  };
>  module_platform_driver(seiko_panel_platform_driver);
> diff --git a/drivers/gpu/drm/panel/panel-sharp-ls037v7dw01.c b/drivers/gpu/drm/panel/panel-sharp-ls037v7dw01.c
> index a07d0f6c3e69..76bd9e810827 100644
> --- a/drivers/gpu/drm/panel/panel-sharp-ls037v7dw01.c
> +++ b/drivers/gpu/drm/panel/panel-sharp-ls037v7dw01.c
> @@ -189,15 +189,13 @@ static int ls037v7dw01_probe(struct platform_device *pdev)
>  	return 0;
>  }
>  
> -static int ls037v7dw01_remove(struct platform_device *pdev)
> +static void ls037v7dw01_remove(struct platform_device *pdev)
>  {
>  	struct ls037v7dw01_panel *lcd = platform_get_drvdata(pdev);
>  
>  	drm_panel_remove(&lcd->panel);
>  	drm_panel_disable(&lcd->panel);
>  	drm_panel_unprepare(&lcd->panel);
> -
> -	return 0;
>  }
>  
>  static const struct of_device_id ls037v7dw01_of_match[] = {
> @@ -209,7 +207,7 @@ MODULE_DEVICE_TABLE(of, ls037v7dw01_of_match);
>  
>  static struct platform_driver ls037v7dw01_driver = {
>  	.probe		= ls037v7dw01_probe,
> -	.remove		= ls037v7dw01_remove,
> +	.remove_new	= ls037v7dw01_remove,
>  	.driver		= {
>  		.name = "panel-sharp-ls037v7dw01",
>  		.of_match_table = ls037v7dw01_of_match,
> diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
> index 065f378bba9d..1274eb95cf86 100644
> --- a/drivers/gpu/drm/panel/panel-simple.c
> +++ b/drivers/gpu/drm/panel/panel-simple.c
> @@ -4335,11 +4335,9 @@ static int panel_simple_platform_probe(struct platform_device *pdev)
>  	return panel_simple_probe(&pdev->dev, id->data);
>  }
>  
> -static int panel_simple_platform_remove(struct platform_device *pdev)
> +static void panel_simple_platform_remove(struct platform_device *pdev)
>  {
>  	panel_simple_remove(&pdev->dev);
> -
> -	return 0;
>  }
>  
>  static void panel_simple_platform_shutdown(struct platform_device *pdev)
> @@ -4360,7 +4358,7 @@ static struct platform_driver panel_simple_platform_driver = {
>  		.pm = &panel_simple_pm_ops,
>  	},
>  	.probe = panel_simple_platform_probe,
> -	.remove = panel_simple_platform_remove,
> +	.remove_new = panel_simple_platform_remove,
>  	.shutdown = panel_simple_platform_shutdown,
>  };
>  
> -- 
> 2.39.2
> 

-- 
Regards,

Laurent Pinchart