From mboxrd@z Thu Jan 1 00:00:00 1970 From: Inki Dae Subject: Re: [PATCH] drm/exynos: Check for NULL dereference of crtc Date: Sat, 07 Mar 2015 21:19:22 +0900 Message-ID: <54FAECCA.2050201@samsung.com> References: <1424193281-30401-1-git-send-email-ckeepax@opensource.wolfsonmicro.com> <54F9A806.6020605@samsung.com> <20150306140431.GE4286@opensource.wolfsonmicro.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: In-reply-to: <20150306140431.GE4286@opensource.wolfsonmicro.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" To: Charles Keepax Cc: linux-samsung-soc@vger.kernel.org, sw0312.kim@samsung.com, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, kyungmin.park@samsung.com, kgene@kernel.org List-Id: linux-samsung-soc@vger.kernel.org T24gMjAxNeuFhCAwM+yblCAwNuydvCAyMzowNCwgQ2hhcmxlcyBLZWVwYXggd3JvdGU6Cj4gT24g 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Thunderbird/17.0.8 To: Charles Keepax Cc: jy0922.shim@samsung.com, sw0312.kim@samsung.com, kyungmin.park@samsung.com, airlied@linux.ie, kgene@kernel.org, dri-devel@lists.freedesktop.org, linux-samsung-soc@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] drm/exynos: Check for NULL dereference of crtc References: <1424193281-30401-1-git-send-email-ckeepax@opensource.wolfsonmicro.com> <54F9A806.6020605@samsung.com> <20150306140431.GE4286@opensource.wolfsonmicro.com> In-reply-to: <20150306140431.GE4286@opensource.wolfsonmicro.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFtrAIsWRmVeSWpSXmKPExsWyRsSkSPfUm18hBv1nrS16z51ksvg35Qa7 xZWv79ksXty7yGLR//g1s8XZpjfsFpd3zWGzmHF+H5PFjMkv2Rw4PTat6mTz2P7tAavH/e7j TB4vJ/5m8+jbsorR4/MmuQC2KC6blNSczLLUIn27BK6MtVensRcsVqk4tJmrgfGZXBcjJ4eE gInEqiVX2SBsMYkL99YD2VwcQgJLGSWaZ05kgymaPecCVGI6o8SRWXOZQBK8AoISPybfY+li 5OBgFpCXOHIpGyTMLKAuMWneImaI+leMEs8WHWWEqNeSaJ05mR2knkVAVWL+Wg6QMBuQOXHF 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B0iYDcicuOI+2C5RgTCJF692MYPYIgIWElOW3GKGmHmDUaJ1RS6ILSzgLLH05GNGiPlrGCUu ze0AK+IUcJBYf3ot8wRGgVlIzpuFcN4sJOctYGRexSiaWpBcUJyUnmuoV5yYW1yal66XnJ+7 iREc78+kdjCubLA4xCjAwajEw/ti1q8QIdbEsuLK3EOMEhzMSiK8r7qAQrwpiZVVqUX58UWl OanFhxhNgZ6byCwlmpwPTEV5JfGGxiZmRpZG5oYWRsbmSuK8SvZtIUIC6YklqdmpqQWpRTB9 TBycUg2Mupu9F6r/3h3x4e6G3YdvJd816nnIoK0vfEPV02F33zLpsumv6xmN5zF+d5g4S23L 0rAbjxzqn8yc+k25PeiM19Fcz87vq7StGxg4/nx02t72/1HCvtOfLzLOTXc8zHZNhy/8hEHc /5eX4hmONDYJnWryr53FZrhnRlaOxccKf/XZsxVkn4s9VmIpzkg01GIuKk4EAM7omgANAwAA DLP-Filter: Pass X-MTR: 20000000000000000@CPGS X-CFilter-Loop: Reflected Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2015년 03월 06일 23:04, Charles Keepax wrote: > On Fri, Mar 06, 2015 at 10:13:42PM +0900, Inki Dae wrote: >> On 2015년 02월 18일 02:14, Charles Keepax wrote: >>> The commit "drm/exynos: remove exynos_plane_dpms" (d9ea6256) removed the >>> use of the enabled flag, which means that the code may attempt to call >>> win_enable on a NULL crtc. This results in the following oops on >> >> Hmm... it's strange. plane->funcs->destroy() is called prior to >> crtc->funcs->destroy() so it should be exynos_crtc is not NULL. However, >> it seems there is any corner case we didn't catch up. >> >> Applied. > > Thanks, it seems the offending path in an error path, looks like > Arndale is missing some required DT setting which causes > exynos_drm_load to fail: Right. With quick look, it seems that this issue is incurred because it tried to access plane->crtc object to call win_disable callback of FIMD driver before mode_set callback is called: plane->crtc would be set by mode_set callback so if it has no pair of encoder and crtc then the plane can never point a crtc object created by FIMD driver. Thanks, Inki Dae > > [ 1.638109] of_graph_get_next_endpoint(): no port node found in /dp-controller@145B0000 > [ 1.646424] exynos-drm exynos-drm: bound 14400000.fimd (ops fimd_component_ops) > [ 1.652704] /dp-controller@145B0000: could not find display-timings node > [ 1.659323] /dp-controller@145B0000: no timings specified > [ 1.664709] [drm:exynos_dp_bind] *ERROR* failed: of_get_videomode() : -22 > [ 1.671485] exynos-drm exynos-drm: failed to bind 145b0000.dp-controller (ops exynos_dp_ops): -22 > > Which ends up calling exynos_plane_destroy as part of the clean up: > > [ 1.698655] [] (unwind_backtrace) from [] (show_stack+0x20/0x24) > [ 1.706385] [] (show_stack) from [] (dump_stack+0x78/0xc4) > [ 1.713588] [] (dump_stack) from [] (exynos_disable_plane+0x2c/0x60) > [ 1.721660] [] (exynos_disable_plane) from [] (exynos_plane_destroy+0x1c/0x30) > [ 1.730605] [] (exynos_plane_destroy) from [] (drm_mode_config_cleanup+0x168/0x20c) > [ 1.739982] [] (drm_mode_config_cleanup) from [] (exynos_drm_load+0xac/0x12c) > [ 1.748832] [] (exynos_drm_load) from [] (drm_dev_register+0xb0/0x110) > [ 1.757075] [] (drm_dev_register) from [] (drm_platform_init+0x50/0xe0) > [ 1.765405] [] (drm_platform_init) from [] (exynos_drm_bind+0x20/0x28) > [ 1.773655] [] (exynos_drm_bind) from [] (try_to_bring_up_master.part.1+0xd8/0x114) > [ 1.783027] [] (try_to_bring_up_master.part.1) from [] (component_master_add_with_match+0xb4/0x134) > [ 1.793792] [] (component_master_add_with_match) from [] (exynos_drm_platform_probe+0xfc/0x124) > [ 1.804207] [] (exynos_drm_platform_probe) from [] (platform_drv_probe+0x58/0xb4) > [ 1.813411] [] (platform_drv_probe) from [] (driver_probe_device+0x11c/0x23c) > [ 1.822261] [] (driver_probe_device) from [] (__driver_attach+0x9c/0xa0) > [ 1.830679] [] (__driver_attach) from [] (bus_for_each_dev+0x64/0x98) > [ 1.838838] [] (bus_for_each_dev) from [] (driver_attach+0x2c/0x30) > [ 1.846824] [] (driver_attach) from [] (bus_add_driver+0xe8/0x1e4) > [ 1.854722] [] (bus_add_driver) from [] (driver_register+0x88/0x104) > [ 1.862794] [] (driver_register) from [] (__platform_driver_register+0x58/0x6c) > [ 1.871827] [] (__platform_driver_register) from [] (exynos_drm_init+0xc8/0x124) > [ 1.880936] [] (exynos_drm_init) from [] (do_one_initcall+0x90/0x1e0) > [ 1.889096] [] (do_one_initcall) from [] (kernel_init_freeable+0x114/0x1e0) > [ 1.897779] [] (kernel_init_freeable) from [] (kernel_init+0x18/0xfc) > [ 1.905934] [] (kernel_init) from [] (ret_from_fork+0x14/0x34) > > Hope that helps some, afraid I am not really familiar enough with > the graphics stack to chase that down much more though. > > Thanks, > Charles > -- > To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html >