On 2012-11-27 21:15, Steve Sakoman wrote: > During my testing I think I uncovered another issue :-( > > I set omapdss.def_disp=lcd43 on the kernel command line to see if the > behavior changed with the LCD as the default device. > > What I encountered was a null pointer crash: > > [ 3.483062] fbcvt: 1024x768@60: CVT Name - .786M3-R > [ 3.488250] Unable to handle kernel NULL pointer dereference at > virtual address 00000028 > [ 3.496765] pgd = c0004000 > [ 3.499603] [00000028] *pgd=00000000 > [ 3.503387] Internal error: Oops: 5 [#1] PREEMPT ARM > [ 3.508605] Modules linked in: > [ 3.511810] CPU: 0 Not tainted (3.6.0 #1) > [ 3.516357] PC is at dss_mgr_check_timings+0x4/0x30 > [ 3.521484] LR is at dpi_check_timings+0x18/0xb8 > [ 3.526336] pc : [<c025df70>] lr : [<c0260dc0>] psr: 40000013 > [ 3.526336] sp : dec2bd88 ip : 22222222 fp : def7e180 > [ 3.538330] r10: def951c0 r9 : def61000 r8 : de41b858 > [ 3.543823] r7 : dec2bdfc r6 : c06c0a50 r5 : dec2be00 r4 : deea1cd4 > [ 3.550659] r3 : dec1ba40 r2 : dec2bdc8 r1 : dec2be00 r0 : 00000000 > [ 3.557495] Flags: nZcv IRQs on FIQs on Mode SVC_32 ISA ARM > Segment kernel > [ 3.565155] Control: 10c5387d Table: 80004019 DAC: 00000015 > [ 3.571166] Process swapper (pid: 1, stack limit = 0xdec2a2f0) > [ 3.577270] Stack: (0xdec2bd88 to 0xdec2c000) > [ 3.581848] bd80: dec1ba40 c0260dc0 ffffffff > deea1cd4 def7e180 c046a7d0 > [ 3.590423] bda0: 22222222 22222222 22222222 22222222 deea1cd4 > c06c0a50 dec2be00 dec2bdfc > [ 3.598968] bdc0: deea1cd4 c06c0a50 dec2be00 c026e738 c06c0a50 > 00000000 de41b800 c046749c > [ 3.607513] bde0: 0000003d c0495788 00000018 00000000 00000010 > def98640 dec00140 00000000 > [ 3.616088] be00: 03000400 0000dac0 00300020 00040050 0003000f > 00000001 00000000 00000000 > [ 3.624664] be20: 00000001 00000000 00000000 c0459380 deea257c > c06c0d00 dec2be50 00000000 > [ 3.633209] be40: c025cc10 c029a98c 00000000 c029ae80 dec075d8 > 00000000 00000000 de41b800 > [ 3.641784] be60: c06c1200 c06c3098 c06c3090 de41b80c 00000002 > 00000001 de41b800 c0689470 > [ 3.650360] be80: def99148 def99148 dec2beb8 c01371c4 dec1ba40 > 00000000 def99148 decdf208 > [ 3.658935] bea0: def95240 c0137e24 00000000 c0054e18 00000000 > 00000003 decdf208 00000000 > [ 3.667510] bec0: c06e25dc c06c3098 c06e25dc c06e25dc c029c728 > 0000009e 00000000 c068920c > [ 3.676055] bee0: 00000000 c029d830 c029d81c c029c514 c06e25dc > c06c3098 c06c3098 c06c30cc > [ 3.684631] bf00: c06e25dc c029c790 00000000 dec2bf18 c06e25dc > c029aa9c dec077d8 decd9670 > [ 3.693176] bf20: c06e25dc c06e25dc c06e8868 def95240 00000000 > c029bb2c c05a9b18 c05a9b18 > [ 3.701751] bf40: c06e25dc 00000001 c06a0c9c c0710300 0000009e > c029ccb4 00000000 c06e25c8 > [ 3.710296] bf60: 00000001 c06a0c9c c0710300 0000009e c068920c > c029daa4 00000007 c06967d8 > [ 3.718872] bf80: c06a0c9c c0689234 dec2a000 c0008654 c068920c > 976c0d2e c06a0cc4 00000008 > [ 3.727447] bfa0: 00000007 c06967d8 c06a0c9c c0710300 0000009e > c0669160 c06967e0 c06698d8 > [ 3.735992] bfc0: 00000007 00000007 c0669160 00000013 00000000 > 00000000 00000000 c06697a0 > [ 3.744567] bfe0: c000eea8 00000013 00000000 00000000 00000000 > c000eea8 fffffff7 dffefffe > [ 3.753143] [<c025df70>] (dss_mgr_check_timings+0x4/0x30) from > [<c0260dc0>] (dpi_check_timings+0x18/0xb8) > [ 3.763183] [<c0260dc0>] (dpi_check_timings+0x18/0xb8) from > [<c026e738>] (tfp410_check_timings+0x28/0x3c) > [ 3.773223] [<c026e738>] (tfp410_check_timings+0x28/0x3c) from > [<c046749c>] (omapfb_parse_def_modes+0x338/0x3f4) > [ 3.783905] [<c046749c>] (omapfb_parse_def_modes+0x338/0x3f4) from > [<c0689470>] (omapfb_probe+0x210/0x600) > [ 3.794036] [<c0689470>] (omapfb_probe+0x210/0x600) from > [<c029d830>] (platform_drv_probe+0x14/0x18) > [ 3.803619] [<c029d830>] (platform_drv_probe+0x14/0x18) from > [<c029c514>] (driver_probe_device+0x11c/0x330) > [ 3.813812] [<c029c514>] (driver_probe_device+0x11c/0x330) from > [<c029c790>] (__driver_attach+0x68/0x8c) > [ 3.823760] [<c029c790>] (__driver_attach+0x68/0x8c) from > [<c029aa9c>] (bus_for_each_dev+0x48/0x80) > [ 3.833251] [<c029aa9c>] (bus_for_each_dev+0x48/0x80) from > [<c029bb2c>] (bus_add_driver+0xf0/0x248) > [ 3.842742] [<c029bb2c>] (bus_add_driver+0xf0/0x248) from > [<c029ccb4>] (driver_register+0x9c/0x12c) > [ 3.852203] [<c029ccb4>] (driver_register+0x9c/0x12c) from > [<c029daa4>] (platform_driver_probe+0x18/0x9c) > [ 3.862243] [<c029daa4>] (platform_driver_probe+0x18/0x9c) from > [<c0689234>] (omapfb_init+0x28/0x54) > [ 3.871826] [<c0689234>] (omapfb_init+0x28/0x54) from [<c0008654>] > (do_one_initcall+0x90/0x160) > [ 3.880950] [<c0008654>] (do_one_initcall+0x90/0x160) from > [<c06698d8>] (kernel_init+0x138/0x1f8) > [ 3.890228] [<c06698d8>] (kernel_init+0x138/0x1f8) from > [<c000eea8>] (kernel_thread_exit+0x0/0x8) > [ 3.899566] Code: e3e00015 e8bd8010 c05d88aa e92d4008 (e5900028) > [ 3.906097] ---[ end trace 38f657b10d460537 ]--- > > It seems that dss_mgr_check_timings is being called with a null dssdev->manager. > > Other than the fact that there should be a null pointer check in the > code, it seems that this is a regression since it used to be possible > to switch the default display in this fashion. Is this no longer > allowed? It is allowed. Which kernel is that? I tried v3.7-rc4 and the current omapdss master, both work for me with overo + lcd43 add on. Tomi
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