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

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Date:   Tue, 15 Feb 2022 23:09:16 +0100
From:   Javier Martinez Canillas <javierm@...hat.com>
To:     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, Andrzej Hajda <andrzej.hajda@...el.com>,
        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

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 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,
-- 
Javier Martinez Canillas
Linux Engineering
Red Hat