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Received: from AM7PR04MB7046.eurprd04.prod.outlook.com (2603:10a6:20b:113::22) by GV1PR04MB10896.eurprd04.prod.outlook.com (2603:10a6:150:204::21) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9542.15; Mon, 26 Jan 2026 08:46:13 +0000 Received: from AM7PR04MB7046.eurprd04.prod.outlook.com ([fe80::4609:64af:8a4b:fd64]) by AM7PR04MB7046.eurprd04.prod.outlook.com ([fe80::4609:64af:8a4b:fd64%4]) with mapi id 15.20.9542.010; Mon, 26 Jan 2026 08:46:13 +0000 Message-ID: <42f86084-5200-4dc0-86a7-4719d7d19cf7@nxp.com> Date: Mon, 26 Jan 2026 16:47:01 +0800 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 3/3] drm/bridge: imx8qxp-pixel-combiner: Fix bailout for imx8qxp_pc_bridge_probe() To: Luca Ceresoli , Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam Cc: dri-devel@lists.freedesktop.org, imx@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org References: <20260123-imx8qxp-drm-bridge-fixes-v1-0-8bb85ada5866@nxp.com> <20260123-imx8qxp-drm-bridge-fixes-v1-3-8bb85ada5866@nxp.com> From: Liu Ying Content-Language: en-US In-Reply-To: Content-Type: text/plain; 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Fix this by checking >> pc->ch[0] before dereferencing it. > > Thanks for checking this code and providing fixes! These drivers have a > complex code path so I had a hard time in following the logic without neing > able to test on hardware. Apologies for the issues emerged. Thanks for your quick review and hard work! > >> Fixes: ae754f049ce1 ("drm/bridge: imx8qxp-pixel-combiner: get/put the next bridge") >> Fixes: 99764593528f ("drm/bridge: imx8qxp-pixel-combiner: convert to devm_drm_bridge_alloc() API") > > The bug was introduced by 99764593528f, while ae754f049ce1 is not changing > the bug, so for the sake of precision we can remove the first 'Fixes:' > line. I added Fixes tag for ae754f049ce1 because it is the first commit which this commit could be applied upon properly. Maybe this helps some tools apply this commit or maybe tools are smart enough to find ae754f049ce1 automatically? > > With that: > Reviewed-by: Luca Ceresoli I hope I can have this R-b. Please let me know if I need to drop the Fixes tag for ae754f049ce1. > > -- > Luca Ceresoli, Bootlin > Embedded Linux and Kernel engineering > https://bootlin.com/ -- Regards, Liu Ying