From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-14.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3C7B8C32771 for ; Thu, 9 Jan 2020 07:29:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0427820673 for ; Thu, 9 Jan 2020 07:29:10 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="ej7W8jgc" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728250AbgAIH3J (ORCPT ); Thu, 9 Jan 2020 02:29:09 -0500 Received: from mail-pj1-f68.google.com ([209.85.216.68]:32994 "EHLO mail-pj1-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728164AbgAIH3I (ORCPT ); Thu, 9 Jan 2020 02:29:08 -0500 Received: by mail-pj1-f68.google.com with SMTP id u63so672334pjb.0 for ; Wed, 08 Jan 2020 23:29:08 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=eb7+4YTwZPIai1tsUX2MFyulW3TpuQQ3q3lzwkxFRow=; b=ej7W8jgc7Qi2towEQUvPZ+HLF2Kev1VG8RzMxUS5owrJ4eTxi+Kf8XMBBX1iBsQitC eMtse3kYPa4wXtk2TSBcfd623EMdWEZsk9Axr5HnIgKhJq6g/bsv/a13TdoLdyZ/A65g p27LdFxT3wMG4atcUFXFjF4Wx7gKd7Yo4MlIc= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=eb7+4YTwZPIai1tsUX2MFyulW3TpuQQ3q3lzwkxFRow=; b=AvqNvvD7LS4pM8cGD7FuvFq4t/c6MsYTh4yNgPLjt1QXmPT2avFDSAkVOhk3NNJM2W vwUk8nt9xApckez+tEziYtfTwSy2X3bGSRUZquo+kVy5pe3Fe6RpPleKAYawY2oxiD6r q5rQqsvdMfoyvNQGm1g5OqkvwVYyNsdNc19IAC4mR77/ehfyS+K/dmH4TTyTiAzuYExc j4w/LS695HYrO7X0gl8esBNM1ji8ymcndRTWTwcT+t5BL/ym1+HqpcBA9f3/eOu6LsB1 HjHFqOr8ZhYr3cvhmi9fMuVdWKUHQ41uzlMjVEXwdZOosIfF3lpJZiGaepj4HM4xN8or II/Q== X-Gm-Message-State: APjAAAXoRHxyK2u/5vtPd1WXqVUOARARLvrX3/e8tVpmmsJWSvPDUIFi TpLgQjuvsKcH5WARewcu2rk6Rw== X-Google-Smtp-Source: APXvYqxyorOub/tc3oX4xjM6D+1C5Oaw62atk5hhMqHpFC6EWGkz1ky0e/G5dlHrY0x2U1r+CwOnrQ== X-Received: by 2002:a17:90a:9284:: with SMTP id n4mr3519891pjo.84.1578554947811; Wed, 08 Jan 2020 23:29:07 -0800 (PST) Received: from hsinyi-z840.tpe.corp.google.com ([2401:fa00:1:10:b852:bd51:9305:4261]) by smtp.gmail.com with ESMTPSA id p16sm6485810pfq.184.2020.01.08.23.29.05 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 08 Jan 2020 23:29:07 -0800 (PST) From: Hsin-Yi Wang To: CK Hu Cc: Philipp Zabel , David Airlie , Matthias Brugger , dri-devel@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH] drm/mediatek: check for comp->funcs Date: Thu, 9 Jan 2020 15:29:00 +0800 Message-Id: <20200109072900.17988-1-hsinyi@chromium.org> X-Mailer: git-send-email 2.25.0.rc1.283.g88dfdc4193-goog MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org There might be some comp that doesn't have funcs, eg. hdmi-connector. Check for comp->funcs otherwise there will be NULL pointer dereference crash. Fixes: bd3de8cd782b ("drm/mediatek: Add gamma property according to hardware capability") Fixes: 7395eab077f9 ("drm/mediatek: Add ctm property support") Signed-off-by: Hsin-Yi Wang --- This patch is based on mediatek's drm branch: https://github.com/ckhu-mediatek/linux.git-tags/commits/mediatek-drm-next-5.6 After https://patchwork.freedesktop.org/patch/344477/?series=63328&rev=59, there will also be funcs for hdmi-connector. --- drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c index fb142fcfc353..7b392d6c71cc 100644 --- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c +++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c @@ -808,11 +808,13 @@ int mtk_drm_crtc_create(struct drm_device *drm_dev, mtk_crtc->ddp_comp[i] = comp; - if (comp->funcs->ctm_set) - has_ctm = true; + if (comp->funcs) { + if (comp->funcs->ctm_set) + has_ctm = true; - if (comp->funcs->gamma_set) - gamma_lut_size = MTK_LUT_SIZE; + if (comp->funcs->gamma_set) + gamma_lut_size = MTK_LUT_SIZE; + } } for (i = 0; i < mtk_crtc->ddp_comp_nr; i++) -- 2.25.0.rc1.283.g88dfdc4193-goog