Re: [Xen-devel] [PATCH 04/51] drm: Set final_kfree in drm_dev_alloc

[Sam Ravnborg <sam@xxxxxxxxxxxx>]

On Mon, Mar 02, 2020 at 11:25:44PM +0100, Daniel Vetter wrote:
> 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.

So ~40 callers - phew..

> 
> 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@xxxxxxxxxx>
> 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@xxxxxxxxxx>
> Date:   Tue Feb 11 14:58:04 2020 +0100
> 
>     drm/virtio: add drm_driver.release callback.
> 
> Cc: Gerd Hoffmann <kraxel@xxxxxxxxxx>
> Cc: Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx>
> Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx

The above will be picked up by tools as regular Cc: lines.
But I guess it is fine.

> 
> Reviewed-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx>
> Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxxx>
> Cc: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
> Cc: Maxime Ripard <mripard@xxxxxxxxxx>
> Cc: Thomas Zimmermann <tzimmermann@xxxxxxx>
> Cc: David Airlie <airlied@xxxxxxxx>
> Cc: Daniel Vetter <daniel@xxxxxxxx>
> Cc: Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx>
> Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx

For the drivers I looked at everything looked fine.

Acked-by: Sam Ravnborg <sam@xxxxxxxxxxxx>

> ---
>  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;
> -- 
> 2.24.1
> 
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