Hi everyone, I use user-space utility from http://git.linuxtv.org/v4l-utils.git/blob/HEAD:/contrib/test/capture-example.c I made two small changes in this application and this is running on i.MX35 SoC fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_RGB565; fmt.fmt.pix.field = V4L2_FIELD_ANY; When MMAP method is used everything works fine, problem occurs when using USERPTR method this can see bellow : ./capture-example -u -f -d /dev/video0 mx3-camera mx3-camera.0: MX3 Camera driver attached to camera 0 Failed acquiring VMA for vaddr 0x76cd9008 VIDIOC_QBUF error 22, Invalid arg Unable to handle kernel NULL pointer dereference at virtual address 00000000 pgd = 80004000 [00000000] *pgd=00000000 Internal error: Oops: 817 [#1] ARM CPU: 0 Not tainted (3.4.0-rc5+ #2283 PC is at mx3_videobuf_release+0x9c/0x10c LR is at mx3_videobuf_release+0x20/0x10c pc : [<802cd92c>] lr : [<802cd8b0>] psr: 00000093 sp : 86db3e00 ip : 86db3e00 fp : 86db3e2c r10: 86ff6b20 r9 : 86817200 r8 : 00000000 r7 : 86ff568c r6 : 00000000 r5 : 8801a000 r4 : 86da3000 r3 : 60000013 r2 : 86da3264 r1 : 00000000 r0 : 00000000 Flags: nzcv IRQs off FIQs on Mode SVC_32 ISA ARM Segment user Control: 00c5387d Table: 86dcc008 DAC: 00000015 Process capture-example (pid: 52, stack limit = 0x86db2268) Stack: (0x86db3e00 to 0x86db4000) 3e00: 00000000 60000013 00000000 86ff568c 00000000 00000002 86ff56ac 00000000 3e20: 86db3e64 86db3e30 802c8978 802cd89c 00000000 80099414 86db3e84 86ff568c 3e40: 86dc9a80 8801a03c 80491828 00000000 86817200 86ff6b20 86db3e7c 86db3e68 3e60: 802c9a1c 802c8930 802ce048 86ff5600 86db3e9c 86db3e80 802cca14 802c9a00 3e80: 86ff5800 86dc9a80 00000008 86dc9a88 86db3eb4 86db3ea0 802b936c 802cc9d0 3ea0: 86dc9a80 86ff6b20 86db3ef4 86db3eb8 80082f00 802b932c 00000000 00000000 3ec0: 00000000 86d35010 86d7f000 86dc9a80 00000000 86d59000 86d90120 0000000c 3ee0: 86db2000 00000000 86db3f14 86db3ef8 8007ff58 80082df0 00000000 86d59000 3f00: 00000000 00000001 86db3f3c 86db3f18 8001c72c 8007fee4 86d59000 86d82000 3f20: 00000100 76ef1770 000000f8 8000e564 86db3f4c 86db3f40 8001c7a8 8001c6b4 3f40: 86db3f7c 86db3f50 8001dab4 8001c78c 7eb002b8 00000001 00000004 00000000 3f60: 86db3fa4 86db3f70 800824fc 000000f8 86db3f94 86db3f80 8001dfc0 8001d8c4 3f80: 0000ffff 000a3d78 86db3fa4 86db3f98 8001e004 8001df4c 00000000 86db3fa8 3fa0: 8000e3e0 8001dff8 000a3d78 76ef1770 00000001 000a3d64 00000008 00000001 3fc0: 000a3d78 76ef1770 76ef1770 000000f8 76e1d248 00000000 00009ecc 7eb02954 3fe0: 76f2e000 7eb02908 76de14dc 76e4f3d4 60000010 00000001 00000000 00000000 Backtrace: [<802cd890>] (mx3_videobuf_release+0x0/0x10c) from [<802c8978>] (__vb2_queue_free+0x54/0x15c) r8:00000000 r7:86ff56ac r6:00000002 r5:00000000 r4:86ff568c [<802c8924>] (__vb2_queue_free+0x0/0x15c) from [<802c9a1c>] (vb2_queue_release+0x28/0x2c) [<802c99f4>] (vb2_queue_release+0x0/0x2c) from [<802cca14>] (soc_camera_close+0x50/0xac) r4:86ff5600 r3:802ce048 [<802cc9c4>] (soc_camera_close+0x0/0xac) from [<802b936c>] (v4l2_release+0x4c/0x6c) r7:86dc9a88 r6:00000008 r5:86dc9a80 r4:86ff5800 [<802b9320>] (v4l2_release+0x0/0x6c) from [<80082f00>] (fput+0x11c/0x204) r5:86ff6b20 r4:86dc9a80 [<80082de4>] (fput+0x0/0x204) from [<8007ff58>] (filp_close+0x80/0x8c) [<8007fed8>] (filp_close+0x0/0x8c) from [<8001c72c>] (put_files_struct+0x84/0xd8) r6:00000001 r5:00000000 r4:86d59000 r3:00000000 [<8001c6a8>] (put_files_struct+0x0/0xd8) from [<8001c7a8>] (exit_files+0x28/0x2c) r8:8000e564 r7:000000f8 r6:76ef1770 r5:00000100 r4:86d82000 r3:86d59000 [<8001c780>] (exit_files+0x0/0x2c) from [<8001dab4>] (do_exit+0x1fc/0x688) [<8001d8b8>] (do_exit+0x0/0x688) from [<8001dfc0>] (do_group_exit+0x80/0xac) r7:000000f8 [<8001df40>] (do_group_exit+0x0/0xac) from [<8001e004>] (sys_exit_group+0x18/0x24) r4:000a3d78 r3:0000ffff [<8001dfec>] (sys_exit_group+0x0/0x24) from [<8000e3e0>] (ret_fast_syscall+0x0/0x30) Code: 05852024 e5941268 e5940264 e2842f99 (e5810000) ument ---[ end trace 23ac1073b67b7fc0 ]--- Fixing recursive fault but reboot is needed! Unfortunately I do not have enough knowledge in this kind of problems, any help will be welcomed. Regards, Alex -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
