Re: [PATCH 37/51] drm/rockchip: Drop explicit drm_mode_config_cleanup call

From: Sam Ravnborg <sam@ravnborg.org>
To: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Francesco Lavra <francescolavra.fl@gmail.com>,
	Intel Graphics Development <intel-gfx@lists.freedesktop.org>,
	Sandy Huang <hjc@rock-chips.com>,
	DRI Development <dri-devel@lists.freedesktop.org>,
	linux-rockchip@lists.infradead.org,
	Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
	Thomas Zimmermann <tzimmermann@suse.de>,
	Daniel Vetter <daniel.vetter@intel.com>,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 37/51] drm/rockchip: Drop explicit drm_mode_config_cleanup call
Date: Sat, 7 Mar 2020 09:38:59 +0100	[thread overview]
Message-ID: <20200307083859.GF28810@ravnborg.org> (raw)
In-Reply-To: <20200302222631.3861340-38-daniel.vetter@ffwll.ch>

On Mon, Mar 02, 2020 at 11:26:17PM +0100, Daniel Vetter wrote:
> It's (almost, there's some iommu stuff without significance) right
> above the drm_dev_put().
> 
> This is made possible by a preceeding patch which added a drmm_
> cleanup action to drm_mode_config_init(), hence all we need to do to
> ensure that drm_mode_config_cleanup() is run on final drm_device
> cleanup is check the new error code for _init().
> 
> Aside: Another driver with a bit much devm_kzalloc, which should
> probably use drmm_kzalloc instead ...
> 
> v2: Explain why this cleanup is possible (Laurent).
> 
> v3: Jump out at the right label (Francesco)
> 
> v4: Try again, kbuild caught that I didn't build test this properly
> ...
> 
> v5: Use drmm_mode_config_init() for more clarity (Sam, Thomas)
> 
> Cc: Sam Ravnborg <sam@ravnborg.org>
> Cc: Thomas Zimmermann <tzimmermann@suse.de>
> Cc: Francesco Lavra <francescolavra.fl@gmail.com>
> Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
> Cc: Sandy Huang <hjc@rock-chips.com>
> Cc: "Heiko Stübner" <heiko@sntech.de>
> Cc: linux-arm-kernel@lists.infradead.org
> Cc: linux-rockchip@lists.infradead.org

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

> ---
>  drivers/gpu/drm/rockchip/rockchip_drm_drv.c | 14 +++++---------
>  1 file changed, 5 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
> index 20ecb1508a22..0f3eb392fe39 100644
> --- a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
> @@ -135,14 +135,16 @@ static int rockchip_drm_bind(struct device *dev)
>  	if (ret)
>  		goto err_free;
>  
> -	drm_mode_config_init(drm_dev);
> +	ret = drmm_mode_config_init(drm_dev);
> +	if (ret)
> +		goto err_iommu_cleanup;
>  
>  	rockchip_drm_mode_config_init(drm_dev);
>  
>  	/* Try to bind all sub drivers. */
>  	ret = component_bind_all(dev, drm_dev);
>  	if (ret)
> -		goto err_mode_config_cleanup;
> +		goto err_iommu_cleanup;
>  
>  	ret = drm_vblank_init(drm_dev, drm_dev->mode_config.num_crtc);
>  	if (ret)
> @@ -173,12 +175,9 @@ static int rockchip_drm_bind(struct device *dev)
>  	rockchip_drm_fbdev_fini(drm_dev);
>  err_unbind_all:
>  	component_unbind_all(dev, drm_dev);
> -err_mode_config_cleanup:
> -	drm_mode_config_cleanup(drm_dev);
> +err_iommu_cleanup:
>  	rockchip_iommu_cleanup(drm_dev);
>  err_free:
> -	drm_dev->dev_private = NULL;
> -	dev_set_drvdata(dev, NULL);
>  	drm_dev_put(drm_dev);
>  	return ret;
>  }
> @@ -194,11 +193,8 @@ static void rockchip_drm_unbind(struct device *dev)
>  
>  	drm_atomic_helper_shutdown(drm_dev);
>  	component_unbind_all(dev, drm_dev);
> -	drm_mode_config_cleanup(drm_dev);
>  	rockchip_iommu_cleanup(drm_dev);
>  
> -	drm_dev->dev_private = NULL;
> -	dev_set_drvdata(dev, NULL);
>  	drm_dev_put(drm_dev);
>  }
>  
> -- 
> 2.24.1
> 
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