From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.17]) (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 CF68A12883A for ; Mon, 25 Mar 2024 10:32:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.17 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711362740; cv=none; b=MVBpeO2MtGM5AZX+7ok4KwL39LvrME3hUNkdt3/9yq8mTpHuhZefwgdGyVaN/MgUH53UINZCyuFw3Jr1C4CrY/74pJV6cbN5PfabnkyA42Dm6xHXn6m85f/efZNaY1D5Z9pxTDUmEvfKO6LuTC4vBiuhQ9O+F0cODpRo0IUcmuM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711362740; c=relaxed/simple; bh=/7yLriuhvRcFxs/cJwyFfIpn2d65gbmkfqddeVZbCcA=; h=From:To:Cc:Subject:In-Reply-To:References:Date:Message-ID: MIME-Version:Content-Type; b=l7aSP0r5jpxzOZ6FaxOTc2wWbA+wQVOE0E52bMJOnLSq9p7VQfVFzU54SZQ3ceZZSleIuwZR1fvJGpdOeBtlnQa4zeNBqJuhsRLSCVvR8V2TCuA7E8sS/jGGbwMSMzAWRU+9wZC50mV6FCglr1ZJ2+GDUJ5cCI6ZL++FSEgWjpM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=ITddNt0z; arc=none smtp.client-ip=198.175.65.17 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="ITddNt0z" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1711362738; x=1742898738; h=from:to:cc:subject:in-reply-to:references:date: message-id:mime-version:content-transfer-encoding; bh=/7yLriuhvRcFxs/cJwyFfIpn2d65gbmkfqddeVZbCcA=; b=ITddNt0zW8h8RzRnZcCph1nHtRihC5Xtl5YAjz0VxfRfYBQ98C02nlq/ HNhzCwUf/sE/Xu01Do/oDPDNyNWD0kaVWEgKXRRPfbmt6FnB7nfiY+/pM o0SZ9P9gN518w7PH/C5zgpwNqA3QO4B94FmTYxJl9POch8HNeFwz7h6VR QISWtNJXOA+O86Jcijwto3xe5SNPLGRZrDH28y/qyjXdcm/aBsKSNzCXa npnqkh9isw6xXZj6CKjhcOdknQoAfwVnhGGi0fIdbeVmNEuMmXT2BHOxj REItU/7ZkMS6LTNeqedMZaBaqFfA0ftEeihhlt4VCaaJJYwBQhn3tBz+C Q==; X-IronPort-AV: E=McAfee;i="6600,9927,11023"; a="6461923" X-IronPort-AV: E=Sophos;i="6.07,152,1708416000"; d="scan'208";a="6461923" Received: from fmviesa008.fm.intel.com ([10.60.135.148]) by orvoesa109.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 25 Mar 2024 03:32:18 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.07,152,1708416000"; d="scan'208";a="15657281" Received: from idirlea-mobl.ger.corp.intel.com (HELO localhost) ([10.252.55.171]) by fmviesa008-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 25 Mar 2024 03:32:13 -0700 From: Jani Nikula To: Ville =?utf-8?B?U3lyasOkbMOk?= Cc: intel-gfx@lists.freedesktop.org, stable@vger.kernel.org Subject: Re: [PATCH 1/2] drm/i915/bios: Tolerate devdata==NULL in intel_bios_encoder_supports_dp_dual_mode() In-Reply-To: Organization: Intel Finland Oy - BIC 0357606-4 - Westendinkatu 7, 02160 Espoo References: <20240319092443.15769-1-ville.syrjala@linux.intel.com> <87sf0mo9hx.fsf@intel.com> Date: Mon, 25 Mar 2024 12:32:10 +0200 Message-ID: <871q7yk3f9.fsf@intel.com> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable On Tue, 19 Mar 2024, Ville Syrj=C3=A4l=C3=A4 wrote: > On Tue, Mar 19, 2024 at 11:29:14AM +0200, Jani Nikula wrote: >> On Tue, 19 Mar 2024, Ville Syrjala wrote: >> > From: Ville Syrj=C3=A4l=C3=A4 >> > >> > If we have no VBT, or the VBT didn't declare the encoder >> > in question, we won't have the 'devdata' for the encoder. >> > Instead of oopsing just bail early. >> > >> > We won't be able to tell whether the port is DP++ or not, >> > but so be it. >> > >> > Cc: stable@vger.kernel.org >> > Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/10464 >> > Signed-off-by: Ville Syrj=C3=A4l=C3=A4 >> > --- >> > drivers/gpu/drm/i915/display/intel_bios.c | 3 +++ >> > 1 file changed, 3 insertions(+) >> > >> > diff --git a/drivers/gpu/drm/i915/display/intel_bios.c b/drivers/gpu/d= rm/i915/display/intel_bios.c >> > index c7841b3eede8..c13a98431a7b 100644 >> > --- a/drivers/gpu/drm/i915/display/intel_bios.c >> > +++ b/drivers/gpu/drm/i915/display/intel_bios.c >> > @@ -3458,6 +3458,9 @@ bool intel_bios_encoder_supports_dp_dual_mode(co= nst struct intel_bios_encoder_da >> > { >> > const struct child_device_config *child =3D &devdata->child; >>=20 >> The above oopses already. > > Nope. It's just taking the address of the thing. I guess. Still looks a bit suspicious. :/ Reviewed-by: Jani Nikula > >>=20 >> BR, >> Jani. >>=20 >> >=20=20 >> > + if (!devdata) >> > + return false; >> > + >> > if (!intel_bios_encoder_supports_dp(devdata) || >> > !intel_bios_encoder_supports_hdmi(devdata)) >> > return false; >>=20 >> --=20 >> Jani Nikula, Intel --=20 Jani Nikula, Intel