linux-kernel - Re: [PATCH] drm/bridge: megachips-stdpxxxx-ge-b850v3-fw: Remove a redundant check on existence of bridge->encoder

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Date: Mon, 13 May 2024 00:21:18 +0300
From: Laurent Pinchart <laurent.pinchart@...asonboard.com>
To: Sui Jingfeng <sui.jingfeng@...ux.dev>
Cc: Maxime Ripard <mripard@...nel.org>,
	Andrzej Hajda <andrzej.hajda@...el.com>,
	Neil Armstrong <neil.armstrong@...aro.org>,
	Robert Foss <rfoss@...nel.org>, Jonas Karlman <jonas@...boo.se>,
	Jernej Skrabec <jernej.skrabec@...il.com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/bridge: megachips-stdpxxxx-ge-b850v3-fw: Remove a
 redundant check on existence of bridge->encoder

Hi Sui,

Thank you for the patch.

On Sat, May 11, 2024 at 10:38:20PM +0800, Sui Jingfeng wrote:
> In the ge_b850v3_lvds_create_connector function, the check on the existence
> of bridge->encoder is not necessary, as it has already been done in the
> drm_bridge_attach() function. And the check on the drm bridge core
> happens before check in the implementation. Hence, it is guaranteed that
> the .encoder member of the struct drm_bridge is not NULL when
> ge_b850v3_lvds_attach() function gets called.
> 
> Remove the redundant checking codes "if (!bridge->encoder) { ... }".
> 
> Signed-off-by: Sui Jingfeng <sui.jingfeng@...ux.dev>

Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

> ---
>  drivers/gpu/drm/bridge/megachips-stdpxxxx-ge-b850v3-fw.c | 5 -----
>  1 file changed, 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/megachips-stdpxxxx-ge-b850v3-fw.c b/drivers/gpu/drm/bridge/megachips-stdpxxxx-ge-b850v3-fw.c
> index 4480523244e4..37f1acf5c0f8 100644
> --- a/drivers/gpu/drm/bridge/megachips-stdpxxxx-ge-b850v3-fw.c
> +++ b/drivers/gpu/drm/bridge/megachips-stdpxxxx-ge-b850v3-fw.c
> @@ -165,11 +165,6 @@ static int ge_b850v3_lvds_create_connector(struct drm_bridge *bridge)
>  	struct drm_connector *connector = &ge_b850v3_lvds_ptr->connector;
>  	int ret;
>  
> -	if (!bridge->encoder) {
> -		DRM_ERROR("Parent encoder object not found");
> -		return -ENODEV;
> -	}
> -
>  	connector->polled = DRM_CONNECTOR_POLL_HPD;
>  
>  	drm_connector_helper_add(connector,

-- 
Regards,

Laurent Pinchart