linux-kernel - Re: [PATCH v2 2/3] drm: Plumb debugfs

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Date:   Tue, 15 Feb 2022 23:20:39 +0100
From:   Andrzej Hajda <andrzej.hajda@...el.com>
To:     Javier Martinez Canillas <javierm@...hat.com>,
        Douglas Anderson <dianders@...omium.org>,
        <dri-devel@...ts.freedesktop.org>
CC:     Daniel Vetter <daniel@...ll.ch>, <robert.foss@...aro.org>,
        <lschyi@...omium.org>, Sam Ravnborg <sam@...nborg.org>,
        <jjsu@...omium.org>, David Airlie <airlied@...ux.ie>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Jonas Karlman <jonas@...boo.se>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        "Neil Armstrong" <narmstrong@...libre.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/3] drm: Plumb debugfs_init through to panels



On 15.02.2022 23:09, Javier Martinez Canillas wrote:
> Hello Doug,
>
> On 2/5/22 01:13, Douglas Anderson wrote:
>
> [snip]
>
>> +static void panel_bridge_debugfs_init(struct drm_bridge *bridge,
>> +				      struct dentry *root)
>> +{
>> +	struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge);
>> +	struct drm_panel *panel = panel_bridge->panel;
>> +
>> +	root = debugfs_create_dir("panel", root);
> This could return a ERR_PTR(-errno) if the function doesn't succeed.
>
> I noticed that most kernel code doesn't check the return value though...
>
>> +	if (panel->funcs->debugfs_init)
> Probably if (!(IS_ERR(root) && panel->funcs->debugfs_init) ?
>
>> +		panel->funcs->debugfs_init(panel, root);
>> +}
> [snip]
>
>> @@ -436,6 +436,9 @@ void drm_debugfs_connector_add(struct drm_connector *connector)
>>   	/* vrr range */
>>   	debugfs_create_file("vrr_range", S_IRUGO, root, connector,
>>   			    &vrr_range_fops);
> Same here, wonder if the return value should be checked.

I've seen sometimes that file/dir was already created with the same 
name, reporting error in such case will be helpful.

Regards
Andrzej

>
> I leave it to you to decide, but regardless of that the patch looks good to me.
>
> Reviewed-by: Javier Martinez Canillas <javierm@...hat.com>
>
> Best regards,