linux-kernel - Re: [PATCH] drm/bridge: cdns-mhdp8546: Remove a redundant check on existence of bridge->encoder

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Message-ID: <20240512212215.GT17158@pendragon.ideasonboard.com>
Date: Mon, 13 May 2024 00:22:15 +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: cdns-mhdp8546: Remove a redundant check on
 existence of bridge->encoder

Hi Sui,

Thank you for the patch.

On Sat, May 11, 2024 at 10:30:27PM +0800, Sui Jingfeng wrote:
> In the cdns_mhdp_connector_init() 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
> adv7511_bridge_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/cadence/cdns-mhdp8546-core.c | 5 -----
>  1 file changed, 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
> index e226acc5c15e..16b58a7dcc54 100644
> --- a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
> +++ b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
> @@ -1697,11 +1697,6 @@ static int cdns_mhdp_connector_init(struct cdns_mhdp_device *mhdp)
>  	struct drm_bridge *bridge = &mhdp->bridge;
>  	int ret;
>  
> -	if (!bridge->encoder) {
> -		dev_err(mhdp->dev, "Parent encoder object not found");
> -		return -ENODEV;
> -	}
> -
>  	conn->polled = DRM_CONNECTOR_POLL_HPD;
>  
>  	ret = drm_connector_init(bridge->dev, conn, &cdns_mhdp_conn_funcs,

-- 
Regards,

Laurent Pinchart