本文主要是介绍super4412下调试cmos驱动是的nternal error: Oops - BUG: 0 [#1] PREEMPT SMP ARM问题解决，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
一直都觉得友善之臂的4412开发板的cmos硬件接口部分有问题，所以友善官方一直没有更新cmos摄像头驱动，但是还是得试着调，
我用的摄像头模块为ov5642，在把摄像头相关的板级配置都添加好后，编译内核，运行出现了
[ 2.970000] v4l2_i2c_subdev_init finished
[ 2.975000] start read ov5642 id
[ 2.975000] ov5642 0-003c: Chip ID 0x5642 detected
[ 2.980000] s5p-fimc-md: Registered sensor subdevice ov5642
[ 2.985000] ------------[ cut here ]------------
[ 2.990000] kernel BUG at drivers/media/media-entity.c:399!
[ 2.995000] Internal error: Oops - BUG: 0 [#1] PREEMPT SMP ARM
[ 3.005000] Modules linked in:
[ 3.005000] CPU: 0 Not tainted (3.5.0-FriendlyARM #3)
[ 3.010000] PC is at media_entity_create_link+0xe8（地址偏移）/0xec）（总大小）
[ 3.015000] LR is at __fimc_md_create_fimc_sink_links+0x13c/0x240
[ 3.025000] pc : [<c038fe84>] lr : [<c0402e10>] psr: 60000013
[ 3.025000] sp : ed043e20 ip : ec97c880 fp : c09186c0
[ 3.035000] r10: 00000000 r9 : 00000001 r8 : ed1bce40
[ 3.040000] r7 : ec97d8a4 r6 : 00000000 r5 : 00000000 r4 : ec97c880
[ 3.045000] r3 : 00000000 r2 : ec97c880 r1 : 00000000 r0 : ed1bce40
[ 3.050000] Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment kernel
[ 3.060000] Control: 10c5387d Table: 4000404a DAC: 00000015
[ 3.065000]
[ 3.065000] PC: 0xc038fe04:
[ 3.070000] fe04 e08aa08a e1a0a10a e083300a e5873004 e587900c e1a00004 ebffffba e2503000
[ 3.080000] fe24 0a00000f e598202c e1a00005 e0826006 e5836000 e594202c e583900c e082a00a
[ 3.085000] fe44 e583a004 e5873008 e5837008 e1d432b8 e2833001 e1c432b8 e8bd87f0 e3e0000b
[ 3.095000] fe64 e8bd87f0 e1d832b6 e3e0000b e2433001 e1c832b6 e8bd87f0 e7f001f2 e7f001f2
[ 3.100000] fe84 e7f001f2 e3500000 012fff1e e5903008 e5933000 e3530000 012fff1e e5933050
[ 3.110000] fea4 e5930008 eaf3c260 e92d4010 e2504000 0a000003 e5943008 e5933000 e3530000
[ 3.120000] fec4 1a000001 e1a00004 e8bd8010 e5933050 e5930008 ebf3bfc1 e3500000 03a04000
[ 3.125000] fee4 e1a00004 e8bd8010 e92d4070 e5902080 e1a04000 e7900182 e3500000 08bd8070
[ 3.135000]
[ 3.135000] LR: 0xc0402d90:
[ 3.140000] 2d90 e1a03007 e1a00006 1a00000c e5952084 e3520000 0a000009 e592c000 e35c0000
[ 3.145000] 2db0 0a000006 e59a202c e59de010 e595107c e082200e e12fff3c e3500000 0a000041
[ 3.155000] 2dd0 e1a0000b e28dd024 e8bd8ff0 e59d2048 e284c070 e1a03552 e2033001 e58d300c
[ 3.165000] 2df0 e59de00c e1a0200c e3a03000 e1a01009 e1a0000a e58dc008 e58de000 ebfe33e2
[ 3.170000] 2e10 e59dc008 e250b000 e59d300c e1a0000c 1affffea e59420a4 e3520000 0affffc4
[ 3.180000] 2e30 e592c000 e35c0000 0affffc1 e59a202c e59de010 e594109c e082200e e12fff3c
[ 3.190000] 2e50 e3500000 1affffba e59d000c e594c080 e3500000 03a0302d 13a0303d e59a2010
[ 3.195000] 2e70 e59d101c e59f0094 e58dc000 eb085a39 e59d100c e59d2014 e2213001 e3520000
[ 3.205000]
[ 3.205000] SP: 0xed043da0:
[ 3.210000] 3da0 00000000 c005e9cc ed04df00 ed04df00 ed043dd4 00000013 ed04e314 ed04df00
[ 3.215000] 3dc0 a0000093 c038fe88 60000013 c0013914 00000000 c00136a8 ed1bce40 00000000
[ 3.225000] 3de0 ec97c880 00000000 ec97c880 00000000 00000000 ec97d8a4 ed1bce40 00000001
[ 3.235000] 3e00 00000000 c09186c0 ec97c880 ed043e20 c0402e10 c038fe84 60000013 ffffffff
[ 3.240000] 3e20 ec97c810 00000000 ec97d810 ec97d8a4 00000000 00000000 ed1bce40 c0402e10
[ 3.250000] 3e40 00000001 60000013 ec97c880 00000001 00000000 ed1bce40 ec97dba8 ec97db40
[ 3.260000] 3e60 00000002 ec97d810 ed1bce40 00000000 ec97d810 00000000 ec97d8b8 00000001
[ 3.265000] 3e80 c09186c0 c04036f0 00000001 00002bb2 ec97db28 ec97db40 ec97db0c ec97c810
[ 3.275000]
[ 3.275000] IP: 0xec97c800:
[ 3.280000] c800 ec989740 c0918684 c02c0b80 00000000 00000000 00000000 00000001 00000000
[ 3.285000] c820 00000000 ec97c824 ec97c824 00000000 c0918530 00000000 c094cbb4 00000000
[ 3.295000] c840 c0909da0 c090a8a8 f0c28000 00000000 00000000 ec97c854 ec97c854 ec988300
[ 3.305000] c860 ec97db28 ec97dc00 ec9b2780 00000000 00000000 ec97e000 00000000 ec97e400
[ 3.310000] c880 ec97e800 ec97e400 ec97d8b8 00000003 ec97c8f0 00020000 00000000 00000000
[ 3.320000] c8a0 00000000 00000002 00020000 ec97c968 ec9899c0 c06a2464 00000000 00000000
[ 3.325000] c8c0 00000000 00000000 00000000 00000000 ec97ccd0 ec97db30 00000000 00000004
[ 3.335000] c8e0 ec97db28 c094cc70 c06a246c 00000000 434d4946 0000302e 00000000 00000000
[ 3.345000]
[ 3.345000] FP: 0xc0918640:
[ 3.350000] 8640 c091a8c0 00000000 ffffffff 00000000 ed1c0ec0 c0918654 c0918654 00000000
[ 3.355000] 8660 00000000 c0908eec c0913550 ed1c0e40 00000000 00000000 00000000 00000000
[ 3.365000] 8680 00000000 ec97c800 ec989940 00000000 00000000 00000000 00000000 00000000
[ 3.370000] 86a0 00000000 00000000 00000002 c091a8c8 c094cad8 00000000 c07c945c ffffffff
[ 3.380000] 86c0 c09325e8 ed0c8500 ed0cb180 c0916f4c c0918b64 c09325f0 ed0812c0 c0932440
[ 3.390000] 86e0 ed0cb200 0000000f 00000007 00000000 00000000 00000000 00000000 00000000
[ 3.395000] 8700 c0918700 c0918700 ed048000 c09325a8 c094ccdc ed0e4440 00000000 00000000
[ 3.405000] 8720 00000000 00000000 c0916fa8 c0918bc0 7fffffff 00000000 00000000 c091873c
[ 3.415000]
[ 3.415000] R0: 0xed1bcdc0:
[ 3.415000] cdc0 00000000 00000000 00000000 00000000 00000000 ed028480 00000000 00000000
[ 3.425000] cde0 00000000 00000000 00000000 00000000 ffffffff ffffffff 00000000 00000000
[ 3.435000] ce00 00000000 ed1bce04 ed1bce04 ed1bce0c ed1bce0c ecd0b04c 00000000 00000000
[ 3.440000] ce20 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 3.450000] ce40 ec97dafc ec97d480 ec97d8b8 0000000d ed1bceb0 00020000 00000000 00000000
[ 3.460000] ce60 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 3.465000] ce80 00000000 00000000 00000000 00000000 ec97db30 ec97d4d0 00000000 00000001
[ 3.475000] cea0 ec97db28 c0947ce8 00000000 00000000 3635766f 30203234 3330302d 00000063
[ 3.485000]
[ 3.485000] R2: 0xec97c800:
[ 3.485000] c800 ec989740 c0918684 c02c0b80 00000000 00000000 00000000 00000001 00000000
[ 3.495000] c820 00000000 ec97c824 ec97c824 00000000 c0918530 00000000 c094cbb4 00000000
[ 3.505000] c840 c0909da0 c090a8a8 f0c28000 00000000 00000000 ec97c854 ec97c854 ec988300
[ 3.510000] c860 ec97db28 ec97dc00 ec9b2780 00000000 00000000 ec97e000 00000000 ec97e400
[ 3.520000] c880 ec97e800 ec97e400 ec97d8b8 00000003 ec97c8f0 00020000 00000000 00000000
[ 3.530000] c8a0 00000000 00000002 00020000 ec97c968 ec9899c0 c06a2464 00000000 00000000
[ 3.535000] c8c0 00000000 00000000 00000000 00000000 ec97ccd0 ec97db30 00000000 00000004
[ 3.545000] c8e0 ec97db28 c094cc70 c06a246c 00000000 434d4946 0000302e 00000000 00000000
[ 3.550000]
[ 3.550000] R4: 0xec97c800:
[ 3.555000] c800 ec989740 c0918684 c02c0b80 00000000 00000000 00000000 00000001 00000000
[ 3.565000] c820 00000000 ec97c824 ec97c824 00000000 c0918530 00000000 c094cbb4 00000000
[ 3.575000] c840 c0909da0 c090a8a8 f0c28000 00000000 00000000 ec97c854 ec97c854 ec988300
[ 3.580000] c860 ec97db28 ec97dc00 ec9b2780 00000000 00000000 ec97e000 00000000 ec97e400
[ 3.590000] c880 ec97e800 ec97e400 ec97d8b8 00000003 ec97c8f0 00020000 00000000 00000000
[ 3.595000] c8a0 00000000 00000002 00020000 ec97c968 ec9899c0 c06a2464 00000000 00000000
[ 3.605000] c8c0 00000000 00000000 00000000 00000000 ec97ccd0 ec97db30 00000000 00000004
[ 3.615000] c8e0 ec97db28 c094cc70 c06a246c 00000000 434d4946 0000302e 00000000 00000000
[ 3.620000]
[ 3.620000] R7: 0xec97d824:
[ 3.625000] d824 ed1bce40 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 3.635000] d844 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 3.640000] d864 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000001
[ 3.650000] d884 c0909ce8 00000000 05b8d800 c0909d44 00000000 00000000 00000000 00000000
[ 3.660000] d8a4 ec97c810 ec97cc10 ec97d010 ec97d410 00000000 c09186c0 00000000 c0677398
[ 3.665000] d8c4 00000000 c09186c0 ec988c00 ec9b22c0 ec97dc64 ec979c0c c09186c8 ed0812c0
[ 3.675000] d8e4 c0932440 ec9b2340 00000003 00000007 00000000 00000000 00000001 00000000
[ 3.685000] d904 00000000 ec97d908 ec97d908 00000000 c0944838 00000000 00000000 00000000
[ 3.690000]
[ 3.690000] R8: 0xed1bcdc0:
[ 3.695000] cdc0 00000000 00000000 00000000 00000000 00000000 ed028480 00000000 00000000
[ 3.705000] cde0 00000000 00000000 00000000 00000000 ffffffff ffffffff 00000000 00000000
[ 3.710000] ce00 00000000 ed1bce04 ed1bce04 ed1bce0c ed1bce0c ecd0b04c 00000000 00000000
[ 3.720000] ce20 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 3.730000] ce40 ec97dafc ec97d480 ec97d8b8 0000000d ed1bceb0 00020000 00000000 00000000
[ 3.735000] ce60 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 3.745000] ce80 00000000 00000000 00000000 00000000 ec97db30 ec97d4d0 00000000 00000001
[ 3.755000] cea0 ec97db28 c0947ce8 00000000 00000000 3635766f 30203234 3330302d 00000063
[ 3.760000] Process swapper/0 (pid: 1, stack limit = 0xed0422f8)
[ 3.765000] Stack: (0xed043e20 to 0xed044000)
[ 3.770000] 3e20: ec97c810 00000000 ec97d810 ec97d8a4 00000000 00000000 ed1bce40 c0402e10
[ 3.780000] 3e40: 00000001 60000013 ec97c880 00000001 00000000 ed1bce40 ec97dba8 ec97db40
[ 3.785000] 3e60: 00000002 ec97d810 ed1bce40 00000000 ec97d810 00000000 ec97d8b8 00000001
[ 3.795000] 3e80: c09186c0 c04036f0 00000001 00002bb2 ec97db28 ec97db40 ec97db0c ec97c810
[ 3.805000] 3ea0: ec97d8b8 c09186c0 00000001 6b6c6373 6d61635f c0140031 c09186c0 c0057364
[ 3.810000] 3ec0: 00000000 ec988b80 ed0cb200 ec9a8c58 c09e679c c09186c0 c09e679c c09e67a4
[ 3.820000] 3ee0: 00000000 c094ccdc c08d9b64 c08a71c0 00000000 c02bfaf4 c02bfae0 c02be8bc
[ 3.830000] 3f00: 00000000 c09186c0 c094ccdc c09186f4 00000000 c08c335c c08a71c0 c02beac0
[ 3.835000] 3f20: c094ccdc ed043f30 c02bea34 c02bd180 ed029c60 ed0c8538 00000000 c094ccdc
[ 3.845000] 3f40: c09325a8 ec988b80 00000000 c02be0b0 c07c945c c0257724 ed029c00 c094ccdc
[ 3.855000] 3f60: c09917c0 ed042000 00000000 c08c335c c08a71c0 c02befe4 c08d10cc c09917c0
[ 3.860000] 3f80: ed042000 00000000 c08c335c c00086a4 c080d88c c0872c04 00000006 00000006
[ 3.870000] 3fa0: c091d82c c08d10c8 00000006 c08d10cc 00000006 c08d10ac c09917c0 0000015d
[ 3.875000] 3fc0: c08a71c0 c08a7918 00000006 00000006 c08a71c0 00000000 00000000 c08a781c
[ 3.885000] 3fe0: c0014b58 00000013 00000000 00000000 00000000 c0014b58 ffffffff ffffffff
[ 3.895000] [<c038fe84>] (media_entity_create_link+0xe8/0xec) from [<c0402e10>] (__fimc_md_create_fimc_sink_links+0x13c/0x240)
[ 3.905000] [<c0402e10>] (__fimc_md_create_fimc_sink_links+0x13c/0x240) from [<c04036f0>] (fimc_md_probe+0x6c8/0x91c)
[ 3.915000] [<c04036f0>] (fimc_md_probe+0x6c8/0x91c) from [<c02bfaf4>] (platform_drv_probe+0x14/0x18)
[ 3.925000] [<c02bfaf4>] (platform_drv_probe+0x14/0x18) from [<c02be8bc>] (driver_probe_device+0x9c/0x214)
[ 3.935000] [<c02be8bc>] (driver_probe_device+0x9c/0x214) from [<c02beac0>] (__driver_attach+0x8c/0x90)
[ 3.945000] [<c02beac0>] (__driver_attach+0x8c/0x90) from [<c02bd180>] (bus_for_each_dev+0x58/0x80)
[ 3.955000] [<c02bd180>] (bus_for_each_dev+0x58/0x80) from [<c02be0b0>] (bus_add_driver+0x180/0x248)
[ 3.960000] [<c02be0b0>] (bus_add_driver+0x180/0x248) from [<c02befe4>] (driver_register+0x78/0x12c)
[ 3.970000] [<c02befe4>] (driver_register+0x78/0x12c) from [<c00086a4>] (do_one_initcall+0x30/0x174)
[ 3.980000] [<c00086a4>] (do_one_initcall+0x30/0x174) from [<c08a7918>] (kernel_init+0xfc/0x1c8)
[ 3.990000] [<c08a7918>] (kernel_init+0xfc/0x1c8) from [<c0014b58>] (kernel_thread_exit+0x0/0x8)
[ 4.000000] Code: e1c832b6 e8bd87f0 e7f001f2 e7f001f2 (e7f001f2)
[ 4.005000] ---[ end trace bed4e52213d7da6d ]---
[ 4.010000] Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b
[ 4.010000]
[ 4.015000] CPU1: stopping
[ 4.015000] [<c001aa44>] (unwind_backtrace+0x0/0xf0) from [<c00192fc>] (handle_IPI+0x184/0x1b8)
[ 4.015000] [<c00192fc>] (handle_IPI+0x184/0x1b8) from [<c0008514>] (gic_handle_irq+0x60/0x68)
[ 4.015000] [<c0008514>] (gic_handle_irq+0x60/0x68) from [<c0013600>] (__irq_svc+0x40/0x70)
[ 4.015000] Exception stack(0xed067f90 to 0xed067fd8)
[ 4.015000] 7f80: ffffffed 00000001 01a33000 00000000
[ 4.015000] 7fa0: ed066000 c0991888 c0900058 c061fb18 c0908728 413fc090 00000000 00000000
[ 4.015000] 7fc0: 00000008 ed067fd8 c0014bb8 c0014bbc 60000013 ffffffff
[ 4.015000] [<c0013600>] (__irq_svc+0x40/0x70) from [<c0014bbc>] (default_idle+0x28/0x30)
[ 4.015000] [<c0014bbc>] (default_idle+0x28/0x30) from [<c0014fb0>] (cpu_idle+0xf4/0x11c)
[ 4.015000] [<c0014fb0>] (cpu_idle+0xf4/0x11c) from [<40616614>] (0x40616614)
[ 4.015000] CPU2: stopping
[ 4.015000] [<c001aa44>] (unwind_backtrace+0x0/0xf0) from [<c00192fc>] (handle_IPI+0x184/0x1b8)
[ 4.015000] [<c00192fc>] (handle_IPI+0x184/0x1b8) from [<c0008514>] (gic_handle_irq+0x60/0x68)
[ 4.015000] [<c0008514>] (gic_handle_irq+0x60/0x68) from [<c0013600>] (__irq_svc+0x40/0x70)
[ 4.015000] Exception stack(0xed069f90 to 0xed069fd8)
[ 4.015000] 9f80: ffffffed 00000002 01a3b000 00000000
[ 4.015000] 9fa0: ed068000 c0991888 c0900058 c061fb18 c0908728 413fc090 00000000 00000000
[ 4.015000] 9fc0: c09b6690 ed069fd8 c0014bb8 c0014bbc 60000013 ffffffff
[ 4.015000] [<c0013600>] (__irq_svc+0x40/0x70) from [<c0014bbc>] (default_idle+0x28/0x30)
[ 4.015000] [<c0014bbc>] (default_idle+0x28/0x30) from [<c0014fb0>] (cpu_idle+0xf4/0x11c)
[ 4.015000] [<c0014fb0>] (cpu_idle+0xf4/0x11c) from [<40616614>] (0x40616614)
[ 4.015000] CPU3: stopping
[ 4.015000] [<c001aa44>] (unwind_backtrace+0x0/0xf0) from [<c00192fc>] (handle_IPI+0x184/0x1b8)
[ 4.015000] [<c00192fc>] (handle_IPI+0x184/0x1b8) from [<c0008514>] (gic_handle_irq+0x60/0x68)
[ 4.015000] [<c0008514>] (gic_handle_irq+0x60/0x68) from [<c0013600>] (__irq_svc+0x40/0x70)
[ 4.015000] Exception stack(0xed06bf90 to 0xed06bfd8)
[ 4.015000] bf80: ffffffed 00000003 01a43000 00000000
[ 4.015000] bfa0: ed06a000 c0991888 c0900058 c061fb18 c0908728 413fc090 00000000 00000000
[ 4.015000] bfc0: 00000008 ed06bfd8 c0014bb8 c0014bbc 60000013 ffffffff
[ 4.015000] [<c0013600>] (__irq_svc+0x40/0x70) from [<c0014bbc>] (default_idle+0x28/0x30)
[ 4.015000] [<c0014bbc>] (default_idle+0x28/0x30) from [<c0014fb0>] (cpu_idle+0xf4/0x11c)
[ 4.015000] [<c0014fb0>] (cpu_idle+0xf4/0x11c) from [<40616614>] (0x40616614)media_entity_create_link+0xe8/0xec) from [<c0402e10>] (__fimc_md_create_fimc_sink_links+0x13c/0x240)[ 2.990000] kernel BUG at drivers/media/media-entity.c:399!
对应的函数为
int
media_entity_create_link(struct media_entity *source, u16 source_pad,struct media_entity *sink, u16 sink_pad, u32 flags)
{struct media_link *link;struct media_link *backlink;BUG_ON(source == NULL || sink == NULL);BUG_ON(source_pad >= source->num_pads);BUG_ON(sink_pad >= sink->num_pads);link = media_entity_add_link(source);if (link == NULL)return -ENOMEM;link->source = &source->pads[source_pad];link->sink = &sink->pads[sink_pad];link->flags = flags;/* Create the backlink. Backlinks are used to help graph traversal and* are not reported to userspace.*/backlink = media_entity_add_link(sink);if (backlink == NULL) {source->num_links--;return -ENOMEM;}backlink->source = &source->pads[source_pad];backlink->sink = &sink->pads[sink_pad];backlink->flags = flags;link->reverse = backlink;backlink->reverse = link;sink->num_backlinks++;return 0;
}BUG_ON(source_pad >= source->num_pads);然后编译内核，
打印信息为
[ 2.620000] !---senor-----__fimc_md_create_fimc_sink_links
[ 2.620000] !---__fimc_md_create_fimc_sink_links to 1 media_entity_create_link
[ 2.620000] Unable to handle kernel NULL pointer dereference at virtual address 00000000
[ 2.620000] pgd = c0004000
[ 2.620000] Internal error: Oops: 5 [#1] PREEMPT SMP ARM
[ 2.620000] Modules linked in:
[ 2.620000] CPU: 0 Not tainted (3.5.0-FriendlyARM #6)
[ 2.620000] PC is at fimc_link_setup+0x4/0x6c
[ 2.620000] LR is at __fimc_md_create_fimc_sink_links+0x1e0/0x288
[ 2.620000] pc : [<c0400158>] lr : [<c0402e64>] psr: a0000013
[ 2.620000] sp : ed043e28 ip : ed1bce40 fp : ec9adba8
[ 2.620000] r10: c0400154 r9 : ed1bce40 r8 : 00000000
[ 2.620000] r7 : ec9ad810 r6 : ec9ad8a4 r5 : ec9ac810 r4 : 00000000
[ 2.620000] r3 : 00000001 r2 : 00000000 r1 : ec9ac968 r0 : ec9ac880
[ 2.620000] Flags: NzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment kernel
[ 2.620000] Control: 10c5387d Table: 4000404a DAC: 00000015
[ 2.620000]
[ 2.620000] PC: 0xc04000d8:
[ 2.620000] 00d8 e5853008 e5943004 e585300c eb0867af e3a00000 e8bd80f8 e5910008 e5926004
[ 2.620000] 00f8 e2800058 ebfaf83d e1d032b4 e1560003 2a00000f e594303c e0866106 e0834206
[ 2.620000] 0118 e285c008 e8b4000f e8ac000f e8b4000f e8ac000f e894000f e88c000f e3a00000
[ 2.620000] 0138 e8bd80f8 e59f000c e30015ff ebf0c120 eaffffe0 e7f001f2 c081edb8 e92d4010
[ 2.620000] 0158 e5922000 e5904094 e5922014 e20228ff e3520802 13e00015 18bd8010 e3540000
[ 2.620000] 0178 0a00000a e2133001 05843328 01a00003 08bd8010 e5943328 e3530000 05902090
[ 2.620000] 0198 13e0000f 01a00003 05842328 e8bd8010 e59f000c e3001598 ebf0c105 e1a00004
[ 2.620000] 01b8 e8bd8010 c081edb8 e92d4070 e5d030f0 e2212001 e7c33192 e1a05001 e5c030f0
[ 2.620000]
[ 2.620000] LR: 0xc0402de4:
[ 2.620000] 2de4 e1a0a452 e59f0118 e20aa001 e58d3020 e58dc010 e58da00c eb085a61 e59dc010
[ 2.620000] 2e04 e59d1018 e1a0000c e59d2020 e3a03000 e58da000 ebfe33cf e3500000 e59dc010
[ 2.620000] 2e24 1a000033 e59530a4 e3530000 0affffaf e5933000 e3530000 e58d3024 0affffab
[ 2.620000] 2e44 e59c202c e59da014 e595109c e082200a e59d300c e59d0020 e59da024 e12fff3a
[ 2.620000] 2e64 e3500000 e59dc010 1affffa0 e59d000c e595e080 e3500000 e59c2010 03a0302d
[ 2.620000] 2e84 13a0303d e59d101c e59f0070 e58dc010 e58de000 eb085a3a e59d100c e59dc010
[ 2.620000] 2ea4 e2213001 e3590000 03833001 e3530000 1affff8b e5995098 e2743001 33a03000
[ 2.620000] 2ec4 e3550000 03a03000 e3530000 0affff84 e1a0000b eb0866c3 e5973094 e1a01000
[ 2.620000]
[ 2.620000] SP: 0xed043da8:
[ 2.620000] 3da8 a0000013 000184c0 00000000 00000000 00000000 c00cfdcc 00000020 000000d0
[ 2.620000] 3dc8 c0400158 a0000013 ffffffff ed043e14 00000000 c0013598 ec9ac880 ec9ac968
[ 2.620000] 3de8 00000000 00000001 00000000 ec9ac810 ec9ad8a4 ec9ad810 00000000 ed1bce40
[ 2.620000] 3e08 c0400154 ec9adba8 ed1bce40 ed043e28 c0402e64 c0400158 a0000013 ffffffff
[ 2.620000] 3e28 00000000 c0402e64 00000001 ec9ad810 ed1bce40 00000001 ed1bce40 00000000
[ 2.620000] 3e48 00000000 ec9adb40 ec9ac880 c0400154 c081f23c ec9ad810 ed1bce40 ed1bce40
[ 2.620000] 3e68 00000001 ec9ad810 ec9ad8b8 00000000 c0918678 c04036c8 00000001 c014c8d0
[ 2.620000] 3e88 c07e82b8 00002b92 ec9adb28 ec9adb40 ec9adb0c 00000001 ec9ad8b8 c0918678
[ 2.620000]
[ 2.620000] IP: 0xed1bcdc0:
[ 2.620000] cdc0 00000000 00000000 00000000 00000000 00000000 ed028480 00000000 00000000
[ 2.620000] cde0 00000000 00000000 00000000 00000000 ffffffff ffffffff 00000000 00000000
[ 2.620000] ce00 00000000 ed1bce04 ed1bce04 ed1bce0c ed1bce0c ecd0b04c 00000000 00000000
[ 2.620000] ce20 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 2.620000] ce40 ec9adafc ec9ad480 ec9ad8b8 0000000d ed1bceb0 00020000 00000000 00000000
[ 2.620000] ce60 00000000 00010000 00020000 00000000 ec987040 00000000 00000000 00000000
[ 2.620000] ce80 00000000 00000000 00000000 00000000 ec9adb30 ec9ad4d0 00000000 00000001
[ 2.625000] cea0 ec9adb28 c0947ca8 00000000 00000000 3635766f 30203234 3330302d 00000063
[ 2.625000]
[ 2.625000] FP: 0xec9adb28:
[ 2.625000] db28 c0918678 ec9ad8b8 ec9ac8d0 ed1bce90 00000000 00000000 2d703573 636d6966
[ 2.625000] db48 00646d2d 00000000 00000000 00000000 00000000 00000000 00000000 c04026e4
[ 2.625000] db68 00000000 00000000 00000000 00000000 00000000 00000001 00000000 00000000
[ 2.625000] db88 ec9adb88 ec9adb88 00000000 00000009 00000000 c0918670 00000000 ec978c58
[ 2.625000] dba8 00000000 00000000 ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
[ 2.625000] dbc8 ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
[ 2.625000] dbe8 ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ec9ae400 ec9adafc
[ 2.625000] dc08 ec9ad8b8 00000001 ec9adddc 00010001 00000000 00000000 00000000 00000000
[ 2.625000]
[ 2.625000] R0: 0xec9ac800:
[ 2.625000] c800 ec9b9740 c091863c c02c0b40 00000000 00000000 00000000 00000001 00000000
[ 2.625000] c820 00000000 ec9ac824 ec9ac824 00000000 c09184e8 00000000 c094cb74 00000000
[ 2.625000] c840 c0909da0 c090a8a8 f0c28000 00000000 00000000 ec9ac854 ec9ac854 ec9b8380
[ 2.625000] c860 ec9adb28 ec9adc00 ec982780 00000000 00000000 ec9ae000 00000000 ec9ae400
[ 2.625000] c880 ec9ae800 ec9ae400 ec9ad8b8 00000003 ec9ac8f0 00020000 00000000 00000000
[ 2.625000] c8a0 00000000 00010002 00020001 ec9ac968 ec9b99c0 c06a2464 00000000 00000000
[ 2.625000] c8c0 00000000 00000000 00000000 00000000 ec9accd0 ec9adb30 00000000 00000004
[ 2.625000] c8e0 ec9adb28 c094cc30 c06a246c 00000000 434d4946 0000302e 00000000 00000000
[ 2.625000]
[ 2.625000] R1: 0xec9ac8e8:
[ 2.625000] c8e8 c06a246c 00000000 434d4946 0000302e 00000000 00000000 00000000 00000000
[ 2.625000] c908 00000000 00000000 00000800 ec9ac810 00000000 00000000 ec978c58 00000000
[ 2.625000] c928 ec9f4814 ec9ae400 00000000 00000001 00000000 00000000 00000000 00000000
[ 2.625000] c948 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 2.625000] c968 ec9ac880 00000000 00000001 ec9ac880 00000001 00000002 ec9ac980 ec9ac980
[ 2.625000] c988 ec9ac988 ec9ac988 c0818904 00000009 00000003 00000000 c094cc08 c0679ffc
[ 2.625000] c9a8 ec9ae000 000002bc 00000000 00000000 00000000 00000000 00000000 00000000
[ 2.625000] c9c8 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 2.625000]
[ 2.625000] R5: 0xec9ac790:
[ 2.625000] c790 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 2.625000] c7b0 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 2.625000] c7d0 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 2.625000] c7f0 00000000 00000000 00000000 00000000 ec9b9740 c091863c c02c0b40 00000000
[ 2.625000] c810 00000000 00000000 00000001 00000000 00000000 ec9ac824 ec9ac824 00000000
[ 2.625000] c830 c09184e8 00000000 c094cb74 00000000 c0909da0 c090a8a8 f0c28000 00000000
[ 2.625000] c850 00000000 ec9ac854 ec9ac854 ec9b8380 ec9adb28 ec9adc00 ec982780 00000000
[ 2.625000] c870 00000000 ec9ae000 00000000 ec9ae400 ec9ae800 ec9ae400 ec9ad8b8 00000003
[ 2.625000]
[ 2.625000] R6: 0xec9ad824:
[ 2.625000] d824 ed1bce40 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 2.625000] d844 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 2.625000] d864 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000001
[ 2.625000] d884 c0909ce8 00000000 05b8d800 c0909d44 00000000 00000000 00000000 00000000
[ 2.625000] d8a4 ec9ac810 ec9acc10 ec9ad010 ec9ad410 00000000 c0918678 00000000 c0677398
[ 2.625000] d8c4 00000000 c0918678 ec9b8c80 ec9822c0 ec9adc64 ec9a9c0c c0918680 ed0812c0
[ 2.625000] d8e4 c0932400 ec982340 00000003 00000007 00000000 00000000 00000001 00000000
[ 2.625000] d904 00000000 ec9ad908 ec9ad908 00000000 c09447f8 00000000 00000000 00000000
[ 2.625000]
[ 2.625000] R7: 0xec9ad790:
[ 2.625000] d790 ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
[ 2.625000] d7b0 ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
[ 2.625000] d7d0 ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
[ 2.625000] d7f0 ffffffff ffffffff ffffffff ffffffff c09187c4 c09187c4 c02c0b40 00000000
[ 2.625000] d810 00000000 00000000 00000000 00000000 c0910418 ed1bce40 00000000 00000000
[ 2.625000] d830 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 2.625000] d850 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 2.625000] d870 00000000 00000000 00000000 00000000 00000001 c0909ce8 00000000 05b8d800
[ 2.625000]
[ 2.625000] R9: 0xed1bcdc0:
[ 2.625000] cdc0 00000000 00000000 00000000 00000000 00000000 ed028480 00000000 00000000
[ 2.625000] cde0 00000000 00000000 00000000 00000000 ffffffff ffffffff 00000000 00000000
[ 2.625000] ce00 00000000 ed1bce04 ed1bce04 ed1bce0c ed1bce0c ecd0b04c 00000000 00000000
[ 2.625000] ce20 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 2.625000] ce40 ec9adafc ec9ad480 ec9ad8b8 0000000d ed1bceb0 00020000 00000000 00000000
[ 2.625000] ce60 00000000 00010000 00020000 00000000 ec987040 00000000 00000000 00000000
[ 2.625000] ce80 00000000 00000000 00000000 00000000 ec9adb30 ec9ad4d0 00000000 00000001
[ 2.625000] cea0 ec9adb28 c0947ca8 00000000 00000000 3635766f 30203234 3330302d 00000063
[ 2.625000]
[ 2.625000] R10: 0xc04000d4:
[ 2.625000] 00d4 e1a00006 e5853008 e5943004 e585300c eb0867af e3a00000 e8bd80f8 e5910008
[ 2.625000] 00f4 e5926004 e2800058 ebfaf83d e1d032b4 e1560003 2a00000f e594303c e0866106
[ 2.625000] 0114 e0834206 e285c008 e8b4000f e8ac000f e8b4000f e8ac000f e894000f e88c000f
[ 2.625000] 0134 e3a00000 e8bd80f8 e59f000c e30015ff ebf0c120 eaffffe0 e7f001f2 c081edb8
[ 2.625000] 0154 e92d4010 e5922000 e5904094 e5922014 e20228ff e3520802 13e00015 18bd8010
[ 2.625000] 0174 e3540000 0a00000a e2133001 05843328 01a00003 08bd8010 e5943328 e3530000
[ 2.625000] 0194 05902090 13e0000f 01a00003 05842328 e8bd8010 e59f000c e3001598 ebf0c105
[ 2.625000] 01b4 e1a00004 e8bd8010 c081edb8 e92d4070 e5d030f0 e2212001 e7c33192 e1a05001
[ 2.625000] Process swapper/0 (pid: 1, stack limit = 0xed0422f8)
[ 2.625000] Stack: (0xed043e28 to 0xed044000)
[ 2.625000] 3e20: 00000000 c0402e64 00000001 ec9ad810 ed1bce40 00000001
[ 2.625000] 3e40: ed1bce40 00000000 00000000 ec9adb40 ec9ac880 c0400154 c081f23c ec9ad810
[ 2.625000] 3e60: ed1bce40 ed1bce40 00000001 ec9ad810 ec9ad8b8 00000000 c0918678 c04036c8
[ 2.625000] 3e80: 00000001 c014c8d0 c07e82b8 00002b92 ec9adb28 ec9adb40 ec9adb0c 00000001
[ 2.625000] 3ea0: ec9ad8b8 c0918678 00000001 6b6c6373 6d61635f c0140031 c0918678 c0057334
[ 2.625000] 3ec0: 00000000 ec9b8c00 ed103200 ec978c58 c09e675c c0918678 c09e675c c09e6764
[ 2.625000] 3ee0: 00000000 c094cc9c c08d9ae4 c08a71c0 00000000 c02bfab4 c02bfaa0 c02be87c
[ 2.625000] 3f00: 00000000 c0918678 c094cc9c c09186ac 00000000 c08c32e8 c08a71c0 c02bea80
[ 2.625000] 3f20: c094cc9c ed043f30 c02be9f4 c02bd140 ed029c60 ed100538 00000000 c094cc9c
[ 2.625000] 3f40: c0932568 ec9b8c00 00000000 c02be070 c07c93b0 c02576e4 ed029c00 c094cc9c
[ 2.625000] 3f60: c0991780 ed042000 00000000 c08c32e8 c08a71c0 c02befa4 c08d1054 c0991780
[ 2.625000] 3f80: ed042000 00000000 c08c32e8 c00086a4 c080d7e0 c0872c98 00000006 00000006
[ 2.625000] 3fa0: c091d7ec c08d1050 00000006 c08d1054 00000006 c08d1034 c0991780 0000015d
[ 2.625000] 3fc0: c08a71c0 c08a7918 00000006 00000006 c08a71c0 00000000 00000000 c08a781c
[ 2.625000] 3fe0: c0014b58 00000013 00000000 00000000 00000000 c0014b58 ffffffff ffffffff
[ 2.625000] [<c0400158>] (fimc_link_setup+0x4/0x6c) from [<c0402e64>] (__fimc_md_create_fimc_sink_links+0x1e0/0x288)
[ 2.625000] [<c0402e64>] (__fimc_md_create_fimc_sink_links+0x1e0/0x288) from [<c04036c8>] (fimc_md_probe+0x6a8/0x948)
[ 2.625000] [<c04036c8>] (fimc_md_probe+0x6a8/0x948) from [<c02bfab4>] (platform_drv_probe+0x14/0x18)
[ 2.625000] [<c02bfab4>] (platform_drv_probe+0x14/0x18) from [<c02be87c>] (driver_probe_device+0x9c/0x214)
[ 2.625000] [<c02be87c>] (driver_probe_device+0x9c/0x214) from [<c02bea80>] (__driver_attach+0x8c/0x90)
[ 2.625000] [<c02bea80>] (__driver_attach+0x8c/0x90) from [<c02bd140>] (bus_for_each_dev+0x58/0x80)
[ 2.625000] [<c02bd140>] (bus_for_each_dev+0x58/0x80) from [<c02be070>] (bus_add_driver+0x180/0x248)
[ 2.625000] [<c02be070>] (bus_add_driver+0x180/0x248) from [<c02befa4>] (driver_register+0x78/0x12c)
[ 2.625000] [<c02befa4>] (driver_register+0x78/0x12c) from [<c00086a4>] (do_one_initcall+0x30/0x174)
[ 2.625000] [<c00086a4>] (do_one_initcall+0x30/0x174) from [<c08a7918>] (kernel_init+0xfc/0x1c8)
[ 2.625000] [<c08a7918>] (kernel_init+0xfc/0x1c8) from [<c0014b58>] (kernel_thread_exit+0x0/0x8)[ 2.620000] Unable to handle kernel NULL pointer dereference at virtual address 00000000[ 2.620000] PC is at fimc_link_setup+0x4/0x6c[ 2.620000] pc : [<c0400158>] 根据分析，发现是内核中的fimc_link_setup这个函数里有出现空指针
static int fimc_link_setup(struct media_entity *entity,const struct media_pad *local,const struct media_pad *remote, u32 flags)
{struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(entity);struct fimc_dev *fimc = v4l2_get_subdevdata(sd);if (media_entity_type(remote->entity) != MEDIA_ENT_T_V4L2_SUBDEV)return -EINVAL;if (WARN_ON(fimc == NULL))return 0;dbg("%s --> %s, flags: 0x%x. input: 0x%x",local->entity->name, remote->entity->name, flags,fimc->vid_cap.input);if (flags & MEDIA_LNK_FL_ENABLED) {if (fimc->vid_cap.input != 0)return -EBUSY;fimc->vid_cap.input = sd->grp_id;return 0;}fimc->vid_cap.input = 0;return 0;
}
static const struct media_entity_operations fimc_sd_media_ops = {.link_setup = fimc_link_setup,
};经过打印消息，const struct media_pad *remote这个传进来的参数是空的，哪里调用了这个函数呢
在
_fimc_md_create_fimc_sink_links(struct fimc_md *fmd, struct media_entity *source, struct v4l2_subdev *sensor, int pad, int link_mask)
函数里的
ret = media_entity_call(sink, link_setup, &sink->pads[0],
&source->pads[pad], flags);
这个调用是执行(entity)->ops.link_setup,
struct fimc_md *fmd参数中带进来的&fmd->fimc[i]->vid_cap.subdev.entity也就是struct media_entity类型的结构,
它的操作函数link_setup，也就是fimc_link_setup函数，后面的&sink->pads[0]和&source->pads[pad]为带入的参数，在此设置一个打印信息，确认传进去的指针的地址值，，&sink->pads[0]来自struct fimc_md *fmd,，而&source->pads[pad]来自于struct media_entity *source形参，
经过打印变量的地址值，
发现，struct media_entity *source变量的地址不为空，但是&source->pads[pad]值为空，这就是问题所在
就是说struct media_entity *source变量的struct media_pad *pads成员，没有进行初始化，为空，
然后，哪个地方调用的__fimc_md_create_fimc_sink_links函数呢，在这个static int fimc_md_create_links(struct fimc_md *fmd)函数里，
case FIMC_ITU_601...FIMC_ITU_656:
source = &sensor->entity;
pad = 0;
break;default:
v4l2_err(&fmd->v4l2_dev, "Wrong bus_type: %x\n",pdata->bus_type);
return -EINVAL;
}
if (source == NULL)
continue;link_mask = 1 << fimc_id++;
ret = __fimc_md_create_fimc_sink_links(fmd, source, sensor,pad, link_mask);
} __fimc_md_create_fimc_sink_links(fmd, source, sensor,pad, link_mask)由上面函数里的具体代码可知
source = &sensor->entity;
sensor = fmd->sensor[i].subdev;
看出source是从&sensor->entity继承来的
Sensor是从md->sensor[i].subdev这里继承来的
所以上面的参数source从md->sensor[i].subdev->entity来，
fimc_md_create_links在哪被调用呢，在 fimc_md_probe(struct platform_device *pdev)中ret = fimc_md_create_links(fmd);
然后上面提到的fmd->sensor[i].subdev>entity在哪里赋值的呢，在fimc_md_probe函数的
if (pdev->dev.platform_data) {
ret = fimc_md_register_sensor_entities(fmd);
if (ret)
goto err_unlock;
}
在 fimc_md_register_sensor_entities(fmd)函数里有
sd = fimc_md_register_sensor(fmd, &fmd->sensor[i]);
ret = __fimc_md_set_camclk(fmd, &fmd->sensor[i], false);
if (!IS_ERR(sd)) {
fmd->sensor[i].subdev = sd;
}
这里有
sd = fimc_md_register_sensor(fmd, &fmd->sensor[i]);
fmd->sensor[i].subdev = sd;，
fimc_md_register_sensor函数展开为
/** Sensor subdevice helper functions*/
static struct v4l2_subdev *fimc_md_register_sensor(struct fimc_md *fmd,struct fimc_sensor_info *s_info)
{struct i2c_adapter *adapter;struct v4l2_subdev *sd = NULL;if (!s_info || !fmd)return NULL;if(s_info->pdata->use_isp){fmd->fimc[0]->is_s5k6a3 = true;fmd->fimc[1]->is_s5k6a3 = true;return fmd->fimc_is_subdev;}adapter = i2c_get_adapter(s_info->pdata->i2c_bus_num);通过I2C号得到I2C适配器，if (!adapter) {v4l2_warn(&fmd->v4l2_dev,"Failed to get I2C adapter %d, deferring probe\n",s_info->pdata->i2c_bus_num);return ERR_PTR(-EPROBE_DEFER);}sd = v4l2_i2c_new_subdev_board(&fmd->v4l2_dev, adapter,s_info->pdata->board_info, NULL);if (IS_ERR_OR_NULL(sd)) {i2c_put_adapter(adapter);v4l2_warn(&fmd->v4l2_dev,"Failed to acquire subdev %s, deferring probe\n",s_info->pdata->board_info->type);return ERR_PTR(-EPROBE_DEFER);}v4l2_set_subdev_hostdata(sd, s_info);sd->grp_id = SENSOR_GROUP_ID;v4l2_info(&fmd->v4l2_dev, "Registered sensor subdevice %s\n",s_info->pdata->board_info->type);fmd->fimc[0]->is_m5mo = true;fmd->fimc[1]->is_m5mo = true;return sd;
}展开v4l2_i2c_new_subdev_board(&fmd->v4l2_dev, adapter,s_info->pdata->board_info, NULL);函数
/* Load an i2c sub-device. */
struct v4l2_subdev *v4l2_i2c_new_subdev_board(struct v4l2_device *v4l2_dev,struct i2c_adapter *adapter, struct i2c_board_info *info,const unsigned short *probe_addrs)
{struct v4l2_subdev *sd = NULL;struct i2c_client *client;BUG_ON(!v4l2_dev);request_module(I2C_MODULE_PREFIX "%s", info->type);/* Create the i2c client */if (info->addr == 0 && probe_addrs)client = i2c_new_probed_device(adapter, info, probe_addrs,NULL);elseclient = i2c_new_device(adapter, info);/* Note: by loading the module first we are certain that c->driverwill be set if the driver was found. If the module was not loadedfirst, then the i2c core tries to delay-load the module for us,and then c->driver is still NULL until the module is finallyloaded. This delay-load mechanism doesn't work if other driverswant to use the i2c device, so explicitly loading the moduleis the best alternative. */if (client == NULL || client->driver == NULL)goto error;/* Lock the module so we can safely get the v4l2_subdev pointer */if (!try_module_get(client->driver->driver.owner))goto error;sd = i2c_get_clientdata(client);/* Register with the v4l2_device which increases the module'suse count as well. */if (v4l2_device_register_subdev(v4l2_dev, sd))sd = NULL;/* Decrease the module use count to match the first try_module_get. */module_put(client->driver->driver.owner);error:/* If we have a client but no subdev, then something went wrong andwe must unregister the client. */if (client && sd == NULL)i2c_unregister_device(client);return sd;
}sd = i2c_get_clientdata(client);这句，知道sd这个结构体是从i2c client得到的，所以
要从i2c client初始化的地方去找 md->sensor[i].subdev-> entityi2c client 的初始化在ov5642的i2c driver方面，
在ov5642.c的static int ov5642_probe(struct i2c_client *client,const struct i2c_device_id *did)
函数中添加
struct v4l2_subdev *sd;//add
priv->pad.flags=MEDIA_PAD_FL_SOURCE;//add
sd->entity.type=MEDIA_ENT_T_V4L2_SUBDEV_SENSOR;//add
ret=media_entity_init(&sd->entity, 1, &priv->pad, 0);//add
if(ret)//add goto error;//add
这样oops打印的错误就解决了，但是在super 4412下的cmos摄像头驱动还是没搞好，硬件上没有成功的案例，总让我怀疑是硬件问题，
这篇关于super4412下调试cmos驱动是的nternal error: Oops - BUG: 0 [#1] PREEMPT SMP ARM问题解决的文章就介绍到这儿，希望我们推荐的文章对编程师们有所帮助！
