Regression in inv_mpu6050: 4.6.0-rc5

One Thousand Gnomes
2016-04-26T22:27:10Z

This now causes us to crash and burn on the ASUS T100TA Baytrail/T
platforms

[ 9.308605] BUG: unable to handle kernel NULL pointer dereference at 0000000000000018
[ 9.310735] IP: [<ffffffffc046622e>] inv_mpu_probe+0x5e/0x110 [inv_mpu6050_i2c]
[ 9.312876] PGD 0
[ 9.314956] Oops: 0000 [#1] SMP
[ 9.317018] Modules linked in: inv_mpu6050_i2c(+) aes_x86_64 lrw gf128mul inv_mpu6050 glue_helper ablk_helper cryptd industrialio_triggered_buffer kfifo_buf industrialio snd_intel_sst_acpi snd_intel_sst_core i2c_mux snd_soc_rt5640 snd_soc_sst_mfld_platform snd_soc_rl6231 snd_soc_sst_match input_leds snd_soc_core hci_uart snd_compress snd_pcm_dmaengine lpc_ich snd_pcm btbcm snd_seq_midi btintel snd_seq_midi_event bluetooth snd_rawmidi wmi snd_seq snd_seq_device dw_dmac snd_timer dw_dmac_core soc_button_array snd soundcore processor_thermal_device int3402_thermal ac97_bus int3403_thermal int3400_thermal i2c_designware_platform intel_soc_dts_iosf int340x_thermal_zone acpi_thermal_rel acpi_pad i2c_designware_core pwm_lpss_platform pwm_lpss ipv6 autofs4 i915 i2c_algo_bit drm_kms_helper syscopyarea sysfillrect
[ 9.326919] sysimgblt fb_sys_fops drm mmc_block hid_generic usbhid i2c_hid video hid sdhci_acpi sdhci
[ 9.332174] CPU: 3 PID: 326 Comm: systemd-udevd Not tainted 4.6.0-rc5+ #3
[ 9.334899] Hardware name: ASUSTeK COMPUTER INC. T100TA/T100TA, BIOS T100TA.307 05/09/2014
[ 9.337655] task: ffff8800706dde80 ti: ffff880035928000 task.ti: ffff880035928000
[ 9.340428] RIP: 0010:[<ffffffffc046622e>] [<ffffffffc046622e>] inv_mpu_probe+0x5e/0x110 [inv_mpu6050_i2c]
[ 9.343286] RSP: 0018:ffff88003592bad8 EFLAGS: 00010287
[ 9.346132] RAX: ffff88003523e000 RBX: ffff880070d57000 RCX: ffff880070e51a40
[ 9.349006] RDX: ffff880070e51a20 RSI: 00000000000000cf RDI: ffff88003523e000
[ 9.351863] RBP: ffff88003592bb08 R08: ffff88007558c9f8 R09: ffff880070e51a40
[ 9.354713] R10: ffff880070e51a38 R11: 0000000000000000 R12: 0000000000000000
[ 9.357569] R13: ffff880070d57000 R14: ffffffffc04661d0 R15: ffff880070d57004
[ 9.360431] FS: 00007f56017618c0(0000) GS:ffff880078980000(0000) knlGS:0000000000000000
[ 9.363330] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 9.366226] CR2: 0000000000000018 CR3: 00000000359f6000 CR4: 00000000001006e0
[ 9.369140] Stack:
[ 9.371988] ffffffff81303a32 00000000000000cf ffff880070d57020 ffffffffc04670c0
[ 9.374883] ffff880070d57020 ffff880070d57000 ffff88003592bb40 ffffffff8141ea6b
[ 9.377769] ffff880070d57020 0000000000000000 ffffffffc0468038 0000000000000029
[ 9.380650] Call Trace:
[ 9.383493] [<ffffffff81303a32>] ? acpi_dev_pm_attach+0x85/0xa2
[ 9.386382] [<ffffffff8141ea6b>] i2c_device_probe+0xfb/0x1b0
[ 9.389260] [<ffffffff8138be67>] driver_probe_device+0x227/0x440
[ 9.392130] [<ffffffff8138c14c>] __driver_attach+0xcc/0xf0
[ 9.395000] [<ffffffff8138c080>] ? driver_probe_device+0x440/0x440
[ 9.397875] [<ffffffff81389a07>] bus_for_each_dev+0x67/0xb0
[ 9.400759] [<ffffffff8138b599>] driver_attach+0x19/0x20
[ 9.403636] [<ffffffff8138b031>] bus_add_driver+0x1e1/0x280
[ 9.406539] [<ffffffffc0076000>] ? 0xffffffffc0076000
[ 9.409424] [<ffffffff8138c8bb>] driver_register+0x5b/0xd0
[ 9.412278] [<ffffffff8141f666>] i2c_register_driver+0x26/0x90
[ 9.415171] [<ffffffffc0076017>] inv_mpu_driver_init+0x17/0x19 [inv_mpu6050_i2c]
[ 9.418058] [<ffffffff810003de>] do_one_initcall+0xae/0x1f0
[ 9.420972] [<ffffffff8113f07b>] ? kmem_cache_alloc+0x2b/0xc0
[ 9.423856] [<ffffffff810fbfa3>] do_init_module+0x55/0x1c5
[ 9.426770] [<ffffffff810c0733>] load_module+0x2123/0x2730
[ 9.429664] [<ffffffff810bd8f0>] ? __symbol_put+0x50/0x50
[ 9.432537] [<ffffffff810c0fb6>] SYSC_finit_module+0xe6/0x120
[ 9.435382] [<ffffffff810c1009>] SyS_finit_module+0x9/0x10
[ 9.438212] [<ffffffff8152819f>] entry_SYSCALL_64_fastpath+0x17/0x93
[ 9.441015] Code: 00 00 00 31 c9 31 d2 48 89 df 48 c7 c6 e0 70 46 c0 e8 37 e7 f3 c0 48 3d 00 f0 ff ff 48 89 c7 0f 87 94 00 00 00 8b b3 d0 02 00 00 <45> 8b 44 24 18 31 c9 4c 89 e2 e8 b3 b9 06 00 85 c0 78 4f 48 8b
[ 9.446976] RIP [<ffffffffc046622e>] inv_mpu_probe+0x5e/0x110 [inv_mpu6050_i2c]
[ 9.449967] RSP <ffff88003592bad8>
[ 9.452844] CR2: 0000000000000018
[ 9.455673] ---[ end trace d9e48d40f1079c34 ]---

Alan