linux-kernel - Re: [PATCH] drm/bridge: it6505: Remove a redundant check on existence of bridge->encoder

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Message-ID: <20240512211506.GM17158@pendragon.ideasonboard.com>
Date: Mon, 13 May 2024 00:15:06 +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: it6505: Remove a redundant check on
 existence of bridge->encoder

Hi Sui,

Thank you for the patch.

On Sat, May 11, 2024 at 10:10:56PM +0800, Sui Jingfeng wrote:
> In it6505_bridge_attach(), the check on the existence of bridge->encoder
> has already been done in the implementation of drm_bridge_attach(). And
> it is done before the bridge->funcs->attach function hook is called. Hence,
> it is guaranteed that the .encoder member of the struct drm_bridge is not
> NULL when the panel_bridge_attach() is called.
> 
> There is no need to check the existence of bridge->encoder another time,
> 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/ite-it6505.c | 5 -----
>  1 file changed, 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/ite-it6505.c b/drivers/gpu/drm/bridge/ite-it6505.c
> index 27334173e911..494030a75dba 100644
> --- a/drivers/gpu/drm/bridge/ite-it6505.c
> +++ b/drivers/gpu/drm/bridge/ite-it6505.c
> @@ -2881,11 +2881,6 @@ static int it6505_bridge_attach(struct drm_bridge *bridge,
>  		return -EINVAL;
>  	}
>  
> -	if (!bridge->encoder) {
> -		dev_err(dev, "Parent encoder object not found");
> -		return -ENODEV;
> -	}
> -
>  	/* Register aux channel */
>  	it6505->aux.drm_dev = bridge->dev;
>  

-- 
Regards,

Laurent Pinchart