Re: [PATCH 10/24] drm/arc: Switch to devm_drm_dev_alloc

[Daniel Vetter <daniel@ffwll.ch>]

On Fri, Sep 04, 2020 at 04:39:27PM +0200, Daniel Vetter wrote:
> - Need to embedded the drm_device, but for now we keep the usual
>   pointer chasing.
> - No more devm_kzalloc, which fixes a lifetime issues on driver
>   remove.
> - No more drm_dev_put, that's done by devm_ now.
> 
> Acked-by: Sam Ravnborg <sam@ravnborg.org>
> Cc: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
> Cc: Alexey Brodkin <abrodkin@synopsys.com>

Ping for some testing/feedback/review on the arcpgu series here. I can
also resend that pile again.

Thanks, Daniel

> ---
>  drivers/gpu/drm/arc/arcpgu.h     |  1 +
>  drivers/gpu/drm/arc/arcpgu_drv.c | 33 +++++++++++++-------------------
>  2 files changed, 14 insertions(+), 20 deletions(-)
> 
> diff --git a/drivers/gpu/drm/arc/arcpgu.h b/drivers/gpu/drm/arc/arcpgu.h
> index 6aac44b953ad..cd9e932f501e 100644
> --- a/drivers/gpu/drm/arc/arcpgu.h
> +++ b/drivers/gpu/drm/arc/arcpgu.h
> @@ -9,6 +9,7 @@
>  #define _ARCPGU_H_
>  
>  struct arcpgu_drm_private {
> +	struct drm_device	drm;
>  	void __iomem		*regs;
>  	struct clk		*clk;
>  	struct drm_framebuffer	*fb;
> diff --git a/drivers/gpu/drm/arc/arcpgu_drv.c b/drivers/gpu/drm/arc/arcpgu_drv.c
> index f164818ec477..68eb4a31c54b 100644
> --- a/drivers/gpu/drm/arc/arcpgu_drv.c
> +++ b/drivers/gpu/drm/arc/arcpgu_drv.c
> @@ -42,18 +42,14 @@ static void arcpgu_setup_mode_config(struct drm_device *drm)
>  
>  DEFINE_DRM_GEM_CMA_FOPS(arcpgu_drm_ops);
>  
> -static int arcpgu_load(struct drm_device *drm)
> +static int arcpgu_load(struct arcpgu_drm_private *arcpgu)
>  {
> -	struct platform_device *pdev = to_platform_device(drm->dev);
> -	struct arcpgu_drm_private *arcpgu;
> +	struct platform_device *pdev = to_platform_device(arcpgu->drm.dev);
>  	struct device_node *encoder_node = NULL, *endpoint_node = NULL;
> +	struct drm_device *drm = &arcpgu->drm;
>  	struct resource *res;
>  	int ret;
>  
> -	arcpgu = devm_kzalloc(&pdev->dev, sizeof(*arcpgu), GFP_KERNEL);
> -	if (arcpgu == NULL)
> -		return -ENOMEM;
> -
>  	drm->dev_private = arcpgu;
>  
>  	arcpgu->clk = devm_clk_get(drm->dev, "pxlclk");
> @@ -162,30 +158,28 @@ static struct drm_driver arcpgu_drm_driver = {
>  
>  static int arcpgu_probe(struct platform_device *pdev)
>  {
> -	struct drm_device *drm;
> +	struct arcpgu_drm_private *arcpgu;
>  	int ret;
>  
> -	drm = drm_dev_alloc(&arcpgu_drm_driver, &pdev->dev);
> -	if (IS_ERR(drm))
> -		return PTR_ERR(drm);
> +	arcpgu = devm_drm_dev_alloc(&pdev->dev, &arcpgu_drm_driver,
> +				    struct arcpgu_drm_private, drm);
> +	if (IS_ERR(arcpgu))
> +		return PTR_ERR(arcpgu);
>  
> -	ret = arcpgu_load(drm);
> +	ret = arcpgu_load(arcpgu);
>  	if (ret)
> -		goto err_unref;
> +		return ret;
>  
> -	ret = drm_dev_register(drm, 0);
> +	ret = drm_dev_register(&arcpgu->drm, 0);
>  	if (ret)
>  		goto err_unload;
>  
> -	drm_fbdev_generic_setup(drm, 16);
> +	drm_fbdev_generic_setup(&arcpgu->drm, 16);
>  
>  	return 0;
>  
>  err_unload:
> -	arcpgu_unload(drm);
> -
> -err_unref:
> -	drm_dev_put(drm);
> +	arcpgu_unload(&arcpgu->drm);
>  
>  	return ret;
>  }
> @@ -196,7 +190,6 @@ static int arcpgu_remove(struct platform_device *pdev)
>  
>  	drm_dev_unregister(drm);
>  	arcpgu_unload(drm);
> -	drm_dev_put(drm);
>  
>  	return 0;
>  }
> -- 
> 2.28.0
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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