[PATCH] drm: Cleanups after drmm_add_final_kfree rollout

[Sam Ravnborg]

On Tue, Mar 03, 2020 at 09:45:20AM +0100, Daniel Vetter wrote:
> A few things:
> - Update the example driver in the documentation.
> - We can drop the old kfree in drm_dev_release.
> - Add a WARN_ON check in drm_dev_register to make sure everyone calls
>   drmm_add_final_kfree and there's no leaks.
> 
> v2: Restore the full cleanup, I accidentally left some moved code
> behind when fixing the bisectability of the series.

Missed that when reading first version.
Good to see this code-snippet be dropped again.
> 
> Cc: Sam Ravnborg <sam at ravnborg.org>
> Cc: Dan Carpenter <dan.carpenter at oracle.com>
> Signed-off-by: Daniel Vetter <daniel.vetter at intel.com>

Acked-by: Sam Ravnborg <sam at ravnborg.org>


> ---
>  drivers/gpu/drm/drm_drv.c | 12 +++++-------
>  1 file changed, 5 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c
> index 80cfd0f14475..1ee606b4a4f9 100644
> --- a/drivers/gpu/drm/drm_drv.c
> +++ b/drivers/gpu/drm/drm_drv.c
> @@ -297,8 +297,6 @@ void drm_minor_release(struct drm_minor *minor)
>   *
>   *		drm_mode_config_cleanup(drm);
>   *		drm_dev_fini(drm);
> - *		kfree(priv->userspace_facing);
> - *		kfree(priv);
>   *	}
>   *
>   *	static struct drm_driver driver_drm_driver = {
> @@ -326,10 +324,11 @@ void drm_minor_release(struct drm_minor *minor)
>   *			kfree(drm);
>   *			return ret;
>   *		}
> + *		drmm_add_final_kfree(drm, priv);
>   *
>   *		drm_mode_config_init(drm);
>   *
> - *		priv->userspace_facing = kzalloc(..., GFP_KERNEL);
> + *		priv->userspace_facing = drmm_kzalloc(..., GFP_KERNEL);
>   *		if (!priv->userspace_facing)
>   *			return -ENOMEM;
>   *
> @@ -838,10 +837,7 @@ static void drm_dev_release(struct kref *ref)
>  
>  	drm_managed_release(dev);
>  
> -	if (!dev->driver->release && !dev->managed.final_kfree) {
> -		WARN_ON(!list_empty(&dev->managed.resources));
> -		kfree(dev);
> -	} else if (dev->managed.final_kfree)
Good to see this go again.


> +	if (dev->managed.final_kfree)
>  		kfree(dev->managed.final_kfree);
>  }
>  
> @@ -959,6 +955,8 @@ int drm_dev_register(struct drm_device *dev, unsigned long flags)
>  	struct drm_driver *driver = dev->driver;
>  	int ret;
>  
> +	WARN_ON(!dev->managed.final_kfree);
> +
>  	if (drm_dev_needs_global_mutex(dev))
>  		mutex_lock(&drm_global_mutex);
>  
> -- 
> 2.24.1
> 
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