Re: [Intel-gfx] [PATCH 04/51] drm: Set final_kfree in drm_dev_alloc

From: Thomas Zimmermann <tzimmermann@suse.de>
To: Daniel Vetter <daniel.vetter@ffwll.ch>,
	DRI Development <dri-devel@lists.freedesktop.org>
Cc: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>,
	David Airlie <airlied@linux.ie>,
	Intel Graphics Development <intel-gfx@lists.freedesktop.org>,
	Gerd Hoffmann <kraxel@redhat.com>,
	Daniel Vetter <daniel.vetter@intel.com>,
	xen-devel@lists.xenproject.org
Subject: Re: [Intel-gfx] [PATCH 04/51] drm: Set final_kfree in drm_dev_alloc
Date: Wed, 11 Mar 2020 10:09:27 +0100	[thread overview]
Message-ID: <502c24ca-0e74-1d35-ce76-0443b1699620@suse.de> (raw)
In-Reply-To: <20200302222631.3861340-5-daniel.vetter@ffwll.ch>


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Am 02.03.20 um 23:25 schrieb Daniel Vetter:
> I also did a full review of all callers, and only the xen driver
> forgot to call drm_dev_put in the failure path. Fix that up too.
> 
> v2: I noticed that xen has a drm_driver.release hook, and uses
> drm_dev_alloc(). We need to remove the kfree from
> xen_drm_drv_release().
> 
> bochs also has a release hook, but leaked the drm_device ever since
> 
> commit 0a6659bdc5e8221da99eebb176fd9591435e38de
> Author: Gerd Hoffmann <kraxel@redhat.com>
> Date:   Tue Dec 17 18:04:46 2013 +0100
> 
>     drm/bochs: new driver
> 
> This patch here fixes that leak.
> 
> Same for virtio, started leaking with
> 
> commit b1df3a2b24a917f8853d43fe9683c0e360d2c33a
> Author: Gerd Hoffmann <kraxel@redhat.com>
> Date:   Tue Feb 11 14:58:04 2020 +0100
> 
>     drm/virtio: add drm_driver.release callback.
> 
> Cc: Gerd Hoffmann <kraxel@redhat.com>
> Cc: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
> Cc: xen-devel@lists.xenproject.org
> 
> Reviewed-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>

Acked-by: Thomas Zimmermann <tzimmermann@suse.de>

> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
> Cc: Maxime Ripard <mripard@kernel.org>
> Cc: Thomas Zimmermann <tzimmermann@suse.de>
> Cc: David Airlie <airlied@linux.ie>
> Cc: Daniel Vetter <daniel@ffwll.ch>
> Cc: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
> Cc: xen-devel@lists.xenproject.org
> ---
>  drivers/gpu/drm/drm_drv.c           | 3 +++
>  drivers/gpu/drm/xen/xen_drm_front.c | 2 +-
>  2 files changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c
> index 153050fc926c..7b84ee8a5eb5 100644
> --- a/drivers/gpu/drm/drm_drv.c
> +++ b/drivers/gpu/drm/drm_drv.c
> @@ -39,6 +39,7 @@
>  #include <drm/drm_color_mgmt.h>
>  #include <drm/drm_drv.h>
>  #include <drm/drm_file.h>
> +#include <drm/drm_managed.h>
>  #include <drm/drm_mode_object.h>
>  #include <drm/drm_print.h>
>  
> @@ -819,6 +820,8 @@ struct drm_device *drm_dev_alloc(struct drm_driver *driver,
>  		return ERR_PTR(ret);
>  	}
>  
> +	drmm_add_final_kfree(dev, dev);
> +
>  	return dev;
>  }
>  EXPORT_SYMBOL(drm_dev_alloc);
> diff --git a/drivers/gpu/drm/xen/xen_drm_front.c b/drivers/gpu/drm/xen/xen_drm_front.c
> index 4be49c1aef51..d22b5da38935 100644
> --- a/drivers/gpu/drm/xen/xen_drm_front.c
> +++ b/drivers/gpu/drm/xen/xen_drm_front.c
> @@ -461,7 +461,6 @@ static void xen_drm_drv_release(struct drm_device *dev)
>  	drm_mode_config_cleanup(dev);
>  
>  	drm_dev_fini(dev);
> -	kfree(dev);
>  
>  	if (front_info->cfg.be_alloc)
>  		xenbus_switch_state(front_info->xb_dev,
> @@ -561,6 +560,7 @@ static int xen_drm_drv_init(struct xen_drm_front_info *front_info)
>  fail_modeset:
>  	drm_kms_helper_poll_fini(drm_dev);
>  	drm_mode_config_cleanup(drm_dev);
> +	drm_dev_put(drm_dev);
>  fail:
>  	kfree(drm_info);
>  	return ret;
> 

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Felix Imendörffer


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