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Thu, 09 Jan 2020 22:29:49 -0800 Received: from MTKMBS02N1.mediatek.inc (172.21.101.77) by MTKMBS62N2.mediatek.inc (172.29.193.42) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Thu, 9 Jan 2020 22:20:25 -0800 Received: from mtkcas09.mediatek.inc (172.21.101.178) by mtkmbs02n1.mediatek.inc (172.21.101.77) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Fri, 10 Jan 2020 14:18:47 +0800 Received: from [172.21.77.4] (172.21.77.4) by mtkcas09.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1395.4 via Frontend Transport; Fri, 10 Jan 2020 14:20:24 +0800 Message-ID: <1578637185.29400.3.camel@mtksdaap41> Subject: Re: [PATCH] drm/mediatek: check for comp->funcs From: CK Hu To: Hsin-Yi Wang Date: Fri, 10 Jan 2020 14:19:45 +0800 In-Reply-To: <20200109072900.17988-1-hsinyi@chromium.org> References: <20200109072900.17988-1-hsinyi@chromium.org> X-Mailer: Evolution 3.10.4-0ubuntu2 MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200109_223002_754966_A17C232D X-CRM114-Status: GOOD ( 14.85 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: David Airlie , linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-mediatek@lists.infradead.org, Philipp Zabel , Matthias Brugger , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi, Hsin-yi: On Thu, 2020-01-09 at 15:29 +0800, Hsin-Yi Wang wrote: > 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") Because the fixed patches are still in my tree, so I merge this patch with the fixed patches in mediatek-drm-next-5.6 [1]. [1] https://github.com/ckhu-mediatek/linux.git-tags/commits/mediatek-drm-next-5.6 Regards, CK > 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++) _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel