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 5EB812AD16 for ; Mon, 22 Dec 2025 12:55:04 +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=1766408106; cv=none; b=ELK/8o/nan0y8McRG1CKJjLArT8+Xh1M0Sl4ivQa9DF8kXPpAdZ5568A9q4Tg1iTIJxNUq0rS2pUKe4nD8v75HZBaFMuzzp6MAGfNv0Um/fWCX0gIHCxZudfxT4WdFOu/pUTbF/E1oDmosrVjvBPXHw2vtLIF0OyA3r5s5MRDu8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1766408106; c=relaxed/simple; bh=iInQE/PvGMSKD299Z/yWCSwIL0N6aB+Zi+vNWeWF79s=; h=Message-ID:Date:MIME-Version:Subject:To:References:From:Cc: In-Reply-To:Content-Type; b=I1tSiD8SeUO4eK8anbeEXJvzHOyy4dWhJL8d7XGWxUX+4XpANFvXEQxDiroZD5AgJolbcLJm5pQ0KgZpFOGe8VYRcWZF/pcDr8+2i1Ju9Dya61BHs56l7sPlfJs+ifUkxHsnebQk7DC3TCsceJQSJySw4EoFkt2C4nageweL6gE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (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=XctsR/TA; arc=none smtp.client-ip=213.167.242.64 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (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="XctsR/TA" Received: from [192.168.88.20] (91-158-153-178.elisa-laajakaista.fi [91.158.153.178]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id 2D6C3593; Mon, 22 Dec 2025 13:54:46 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1766408087; bh=iInQE/PvGMSKD299Z/yWCSwIL0N6aB+Zi+vNWeWF79s=; h=Date:Subject:To:References:From:Cc:In-Reply-To:From; b=XctsR/TAGfSSAetRkXsqmM5oEi5NWFiCpMqhOtS75vLgcq4oZs+Lw4yaTqNUlN66A nPmTOFYJrYDoCE1c7n9DAf0p8ktqweTIS00GqkCOyRFknXsY1KflKa8iF/66/JC6au DaVg1Nnui8DdUletaCa3sfOXEVYFJr3sbl9Pf/Mk= Message-ID: <486581cb-6f67-4e7b-a58f-c0f96d2babd9@ideasonboard.com> Date: Mon, 22 Dec 2025 14:54:53 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v10 1/6] drm/bridge: cadence: cdns-mhdp8546-core: Set the mhdp connector earlier in atomic_enable() To: Harikrishna Shenoy References: <20251209120332.3559893-1-h-shenoy@ti.com> <20251209120332.3559893-2-h-shenoy@ti.com> From: Tomi Valkeinen Content-Language: en-US Cc: Laurent.pinchart@ideasonboard.com, airlied@gmail.com, andrzej.hajda@intel.com, andy.yan@rock-chips.com, aradhya.bhatia@linux.dev, devarsht@ti.com, dianders@chromium.org, dri-devel@lists.freedesktop.org, javierm@redhat.com, jernej.skrabec@gmail.com, jonas@kwiboo.se, linux-kernel@vger.kernel.org, linux@treblig.org, luca.ceresoli@bootlin.com, lumag@kernel.org, lyude@redhat.com, maarten.lankhorst@linux.intel.com, mordan@ispras.ru, mripard@kernel.org, neil.armstrong@linaro.org, rfoss@kernel.org, s-jain1@ti.com, simona@ffwll.ch, tzimmermann@suse.de, u-kumar1@ti.com Autocrypt: addr=tomi.valkeinen@ideasonboard.com; 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charset=UTF-8 Content-Transfer-Encoding: 7bit Hi, On 09/12/2025 14:03, Harikrishna Shenoy wrote: > From: Jayesh Choudhary > > In case if we get errors in cdns_mhdp_link_up() or cdns_mhdp_reg_read() > in atomic_enable, we will go to cdns_mhdp_modeset_retry_fn() and will hit > NULL pointer while trying to access the mutex. We need the connector to > be set before that. Unlike in legacy cases with flag > !DRM_BRIDGE_ATTACH_NO_CONNECTOR, we do not have connector initialised > in bridge_attach(), so add the mhdp->connector_ptr in device structure > to handle both cases with DRM_BRIDGE_ATTACH_NO_CONNECTOR and > !DRM_BRIDGE_ATTACH_NO_CONNECTOR, set it in atomic_enable() earlier to > avoid possible NULL pointer dereference in recovery paths like > modeset_retry_fn() with the DRM_BRIDGE_ATTACH_NO_CONNECTOR flag set. > > Fixes: c932ced6b585 ("drm/tidss: Update encoder/bridge chain connect model") > Signed-off-by: Jayesh Choudhary > Signed-off-by: Harikrishna Shenoy > --- > .../drm/bridge/cadence/cdns-mhdp8546-core.c | 29 ++++++++++--------- > .../drm/bridge/cadence/cdns-mhdp8546-core.h | 1 + > .../drm/bridge/cadence/cdns-mhdp8546-hdcp.c | 18 +++++++++--- > 3 files changed, 30 insertions(+), 18 deletions(-) Reviewed-by: Tomi Valkeinen Tomi