I turned on some mutex debugging options, and now I'm getting this in my audio driver:

Freescale Synchronous Serial Interface (SSI) ASoC Driver BUG: key e69d3aac not in .data! ------------[ cut here ]------------ WARNING: at /home/b04825/git/linux.10b/kernel/lockdep.c:2980 Modules linked in: NIP: c0078160 LR: c0078148 CTR: 00000000 REGS: e685dcd0 TRAP: 0700 Not tainted (3.2.0-10b-00093-gebea711-dirty) MSR: 00029000 <EE,ME,CE> CR: 22044042 XER: 20000000 TASK = e6860000[1] 'swapper' THREAD: e685c000 CPU: 0 GPR00: 00000000 e685dd80 e6860000 00000001 00000001 c0043824 00000000 00000002 GPR08: 00000000 c0620000 00000001 00000000 22044042 40401800 00000000 00000000 GPR16: c0000a00 00000014 3fffffff 03ff9000 00000015 7ff3a68c c061e000 00000000 GPR24: 00000000 00000000 00001700 fffffff4 00000124 e6f9a3c0 c0620000 e6f9a3c8 NIP [c0078160] lockdep_init_map+0x25c/0x468 LR [c0078148] lockdep_init_map+0x244/0x468 Call Trace: [e685dd80] [c0078138] lockdep_init_map+0x234/0x468 (unreliable) [e685ddc0] [c0133740] sysfs_add_file_mode+0x98/0xf8 [e685ddf0] [c0277578] device_create_file+0x20/0x30 [e685de00] [c0462754] fsl_ssi_probe+0x284/0x410 [e685deb0] [c027ba2c] platform_drv_probe+0x20/0x30 [e685dec0] [c027a4b0] driver_probe_device+0xa4/0x1d4 [e685dee0] [c027a6a4] __driver_attach+0xc4/0xc8 [e685df00] [c027939c] bus_for_each_dev+0x60/0x9c [e685df30] [c027a0e4] driver_attach+0x24/0x34 [e685df40] [c0279d30] bus_add_driver+0x1b0/0x278 [e685df70] [c027aab8] driver_register+0x88/0x154 [e685df90] [c027bd5c] platform_driver_register+0x68/0x78 [e685dfa0] [c05d822c] fsl_ssi_init+0x24/0x34 [e685dfb0] [c0001eb8] do_one_initcall+0x34/0x1ac [e685dfe0] [c05b984c] kernel_init+0xa0/0x13c [e685dff0] [c000e588] kernel_thread+0x4c/0x68 Instruction dump: 7ca42b78 483e03b9 801e5158 2f800000 409efe30 4819def5 2f830000 41befe24 3d20c062 80095328 2f800000 40befe14 <0fe00000> 4bfffe0c 3f9c000a 881cc010 ---[ end trace d5a900576f6c55ce ]---

Is there something wrong with the way I'm calling device_create_file()? That code has been around for years. I don't understand what the kernel is complainging about.