From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from perceval.ideasonboard.com (perceval.ideasonboard.com [213.167.242.64]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0D92E3233 for ; Sun, 12 May 2024 21:19:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=213.167.242.64 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715548754; cv=none; b=sy0bXJH+XQhbvsUUVhL9/z05wOsVD9GbmZk5m+bLpoNc3/0kHD5EjMKj4f2kq7N8g7/Db11D2YRFpd/smvK35bjU/eH8gmKY0UaniEtj66oSQyN4Uco90dbUR+jdYlZioFt3qMvs5UYVQctTSG22wD6uyWEttF876JbWyUapK18= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715548754; c=relaxed/simple; bh=W5wIChAYZ5UvL2GEo9zFX6SQxx9WytPsTIt3oj8gUuM=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=USNdY3JhyjnzZE5CMswbXbl4+DRS7dNqIYQHi6i5YS4ksreCLuosOi3CwauKmxjnR563bk1AMtX+zWG54qbd8KWVyYL3Hsjt66pGFmd5Fq3hwNg8FdP2CGHAPA7fxNhL7dEM6WZNpUcefzAeDrEHfgd38pCIhGRz8INf2rZhQVM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=ideasonboard.com; spf=pass smtp.mailfrom=ideasonboard.com; dkim=pass (1024-bit key) header.d=ideasonboard.com header.i=@ideasonboard.com header.b=l1krWNOQ; arc=none smtp.client-ip=213.167.242.64 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=ideasonboard.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=ideasonboard.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=ideasonboard.com header.i=@ideasonboard.com header.b="l1krWNOQ" Received: from pendragon.ideasonboard.com (81-175-209-231.bb.dnainternet.fi [81.175.209.231]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id C355C8BE; Sun, 12 May 2024 23:19:05 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1715548746; bh=W5wIChAYZ5UvL2GEo9zFX6SQxx9WytPsTIt3oj8gUuM=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=l1krWNOQ04OrDPabstuawxD40jtbNzuAX7l9xF3TivsxgQSAm3byLtkF5aYL+8B9n vWtl/gB8j6D4xcpFJ7QXNJ8gjgsyK63rP29wGSHp86uEyEUX8kQwmjlaJ5XSGVWQ8u NxtQSKdT3XpADAw4dqeRyd8H55O5uKRRgtqT7N8g= Date: Mon, 13 May 2024 00:19:03 +0300 From: Laurent Pinchart To: Sui Jingfeng Cc: Maxime Ripard , Andrzej Hajda , Neil Armstrong , Robert Foss , Jonas Karlman , Jernej Skrabec , Maarten Lankhorst , Thomas Zimmermann , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] drm/bridge: lt9611uxc: Remove a redundant check on existence of bridge->encoder Message-ID: <20240512211903.GQ17158@pendragon.ideasonboard.com> References: <20240511145549.325852-1-sui.jingfeng@linux.dev> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20240511145549.325852-1-sui.jingfeng@linux.dev> Hi Sui, Thank you for the patch. On Sat, May 11, 2024 at 10:55:49PM +0800, Sui Jingfeng wrote: > In the lt9611uxc_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 > lt9611uxc_connector_init() function gets called. > > Remove the redundant checking codes "if (!bridge->encoder) { ... }". > > Signed-off-by: Sui Jingfeng Reviewed-by: Laurent Pinchart > --- > drivers/gpu/drm/bridge/lontium-lt9611uxc.c | 5 ----- > 1 file changed, 5 deletions(-) > > diff --git a/drivers/gpu/drm/bridge/lontium-lt9611uxc.c b/drivers/gpu/drm/bridge/lontium-lt9611uxc.c > index f4f593ad8f79..f1fccfe6c534 100644 > --- a/drivers/gpu/drm/bridge/lontium-lt9611uxc.c > +++ b/drivers/gpu/drm/bridge/lontium-lt9611uxc.c > @@ -339,11 +339,6 @@ static int lt9611uxc_connector_init(struct drm_bridge *bridge, struct lt9611uxc > { > int ret; > > - if (!bridge->encoder) { > - DRM_ERROR("Parent encoder object not found"); > - return -ENODEV; > - } > - > lt9611uxc->connector.polled = DRM_CONNECTOR_POLL_HPD; > > drm_connector_helper_add(<9611uxc->connector, -- Regards, Laurent Pinchart