linux-kernel - Re: [PATCH] drm/bridge: Remove a small useless code snippet

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Date: Mon, 13 May 2024 00:09:07 +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: Remove a small useless code snippet

Hi Sui,

Thank you for the patch.

On Sat, May 11, 2024 at 08:42:38PM +0800, Sui Jingfeng wrote:
> Because the check on the non-existence (encoder == NULL) has already been
> done in the implementation of drm_bridge_attach() function, and
> drm_bridge_attach() is called earlier. The driver won't get to check point
> even if drm_bridge_attach() fails for some reasons, as it will clear the
> bridge->encoder to NULL and return a negective error code.

s/negective/negative/

> 
> Therefore, there is no need to check another again. Remove the redundant
> codes at the later.
> 
> Signed-off-by: Sui Jingfeng <sui.jingfeng@...ux.dev>

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

If you end up sending a second version of this patch, please include all
similar patches you have sent at the same time in a patch series,
instead of sending them separately.

> ---
>  drivers/gpu/drm/bridge/simple-bridge.c | 5 -----
>  1 file changed, 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/simple-bridge.c b/drivers/gpu/drm/bridge/simple-bridge.c
> index 28376d0ecd09..3caa918ac2e0 100644
> --- a/drivers/gpu/drm/bridge/simple-bridge.c
> +++ b/drivers/gpu/drm/bridge/simple-bridge.c
> @@ -116,11 +116,6 @@ static int simple_bridge_attach(struct drm_bridge *bridge,
>  	if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)
>  		return 0;
>  
> -	if (!bridge->encoder) {
> -		DRM_ERROR("Missing encoder\n");
> -		return -ENODEV;
> -	}
> -
>  	drm_connector_helper_add(&sbridge->connector,
>  				 &simple_bridge_con_helper_funcs);
>  	ret = drm_connector_init_with_ddc(bridge->dev, &sbridge->connector,

-- 
Regards,

Laurent Pinchart