Re: [PATCH] drm/qxl: Use managed mode-config init

From: Daniel Vetter <daniel@ffwll.ch>
To: Tian Tao <tiantao6@hisilicon.com>
Cc: airlied@linux.ie, airlied@redhat.com,
	dri-devel@lists.freedesktop.org, kraxel@redhat.com
Subject: Re: [PATCH] drm/qxl: Use managed mode-config init
Date: Thu, 7 Jan 2021 18:03:48 +0100	[thread overview]
Message-ID: <X/c+9Nm2DvLXkBtM@phenom.ffwll.local> (raw)
In-Reply-To: <1609153481-9909-1-git-send-email-tiantao6@hisilicon.com>

On Mon, Dec 28, 2020 at 07:04:41PM +0800, Tian Tao wrote:
> Using drmm_mode_config_init() sets up managed release of modesetting
> resources.
> 
> Signed-off-by: Tian Tao <tiantao6@hisilicon.com>

This changes the order of the cleanup actions, so most likely will break
really badly. You can only move a cleanup action safely over to drmm_ if
it is the last thing (at the time the patch is applied) done before
cleanup is finished. There's a _lot_ of code that's run after
qxl_modeset_fini.
-Daniel

> ---
>  drivers/gpu/drm/qxl/qxl_display.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/qxl/qxl_display.c b/drivers/gpu/drm/qxl/qxl_display.c
> index 012bce0..38d6b59 100644
> --- a/drivers/gpu/drm/qxl/qxl_display.c
> +++ b/drivers/gpu/drm/qxl/qxl_display.c
> @@ -1195,7 +1195,9 @@ int qxl_modeset_init(struct qxl_device *qdev)
>  	int i;
>  	int ret;
>  
> -	drm_mode_config_init(&qdev->ddev);
> +	ret = drmm_mode_config_init(&qdev->ddev);
> +	if (ret)
> +		return ret;
>  
>  	ret = qxl_create_monitors_object(qdev);
>  	if (ret)
> @@ -1228,5 +1230,4 @@ int qxl_modeset_init(struct qxl_device *qdev)
>  void qxl_modeset_fini(struct qxl_device *qdev)
>  {
>  	qxl_destroy_monitors_object(qdev);
> -	drm_mode_config_cleanup(&qdev->ddev);
>  }
> -- 
> 2.7.4
> 

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