WARNING: No atomic I2C transfer handler for 'i2c-4' at drivers/i2c/i2c-core.h:40 i2c_smbus_xfer+0x178/0x190 (kernel 6.6.X, 6.7-rcX, PowerMac G5 11,2)

[Erhard Furtner]

Greetings!

I am getting this on my PowerMac G5 11,2 at reboot on kernels 6.6.X and 6.7-rcX:

[...]
reboot: Restarting system
------------[ cut here ]------------
No atomic I2C transfer handler for 'i2c-4'
WARNING: CPU: 1 PID: 362 at drivers/i2c/i2c-core.h:40 i2c_smbus_xfer+0x178/0x190
Modules linked in: windfarm_cpufreq_clamp windfarm_smu_sensors windfarm_smu_controls windfarm_pm112 snd_aoa_codec_onyx windfarm_pid snd_aoa_fabric_layout snd_aoa nouveau windfarm_smu_sat snd_aoa_i2sbus windfarm_lm75_sensor snd_aoa_soundbus windfarm_max6690_sensor firewire_ohci snd_pcm windfarm_core drm_exec snd_timer firewire_core crc_itu_t gpu_sched snd i2c_algo_bit backlight drm_ttm_helper ttm soundcore ohci_pci rack_meter tg3 drm_display_helper hwmon cfg80211 rfkill zram zsmalloc loop dm_mod configfs
CPU: 1 PID: 362 Comm: kwindfarm Not tainted 6.6.7-gentoo-PMacG5 #1
Hardware name: PowerMac11,2 PPC970MP 0x440101 PowerMac
NIP:  c000000000b03f68 LR: c000000000b03f64 CTR: 0000000000000000
REGS: c00000001fddf930 TRAP: 0700   Not tainted  (6.6.7-gentoo-PMacG5)
MSR:  9000000000029032 <SF,HV,EE,ME,IR,DR,RI>  CR: 24002842  XER: 00000000
IRQMASK: 0 
GPR00: 0000000000000000 c00000001fddfbd0 c0000000010dd900 0000000000000000 
GPR04: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 
GPR08: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 
GPR12: 0000000000000000 c00000000ffff700 c000000000101558 c00000001be361c0 
GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 
GPR20: 0000000000000000 0000000000000000 0000000000000000 c0003d0000348258 
GPR24: 0000000051eb851f 000000000000004c 0000000000000000 0000000000000001 
GPR28: 0000000000000001 0000000000000002 c00000001fddfc96 c0000000040c8828 
NIP [c000000000b03f68] i2c_smbus_xfer+0x178/0x190
LR [c000000000b03f64] i2c_smbus_xfer+0x174/0x190
Call Trace:
[c00000001fddfbd0] [c000000000b03f64] i2c_smbus_xfer+0x174/0x190 (unreliable)
[c00000001fddfc70] [c000000000b040d4] i2c_smbus_read_byte_data+0x64/0xd0
[c00000001fddfcd0] [c0003d00003290c8] wf_max6690_get+0x30/0x90 [windfarm_max6690_sensor]
[c00000001fddfd00] [c0003d000006878c] pm112_wf_notify+0x564/0x118c [windfarm_pm112]
[c00000001fddfe00] [c000000000103364] notifier_call_chain+0xa4/0x190
[c00000001fddfea0] [c00000000010387c] blocking_notifier_call_chain+0x5c/0xb0
[c00000001fddfee0] [c0003d000034ebe0] wf_thread_func+0xe8/0x190 [windfarm_core]
[c00000001fddff90] [c000000000101680] kthread+0x130/0x140
[c00000001fddffe0] [c00000000000bfb0] start_kernel_thread+0x14/0x18
Code: 39800000 4e800020 e9290018 2c290000 4082ff1c e88300e0 2c240000 4182001c 3c62fff4 3863f2b0 4b5bf379 60000000 <0fe00000> 4bfffef8 e8830090 4bffffe4 
---[ end trace 0000000000000000 ]---
------------[ cut here ]------------
No atomic I2C transfer handler for 'i2c-4'
WARNING: CPU: 1 PID: 362 at drivers/i2c/i2c-core.h:40 i2c_smbus_xfer+0x178/0x190
Modules linked in: windfarm_cpufreq_clamp windfarm_smu_sensors windfarm_smu_controls windfarm_pm112 snd_aoa_codec_onyx windfarm_pid snd_aoa_fabric_layout snd_aoa nouveau windfarm_smu_sat snd_aoa_i2sbus windfarm_lm75_sensor snd_aoa_soundbus windfarm_max6690_sensor firewire_ohci snd_pcm windfarm_core drm_exec snd_timer firewire_core crc_itu_t gpu_sched snd i2c_algo_bit backlight drm_ttm_helper ttm soundcore ohci_pci rack_meter tg3 drm_display_helper hwmon cfg80211 rfkill zram zsmalloc loop dm_mod configfs
CPU: 1 PID: 362 Comm: kwindfarm Tainted: G        W          6.6.7-gentoo-PMacG5 #1
Hardware name: PowerMac11,2 PPC970MP 0x440101 PowerMac
NIP:  c000000000b03f68 LR: c000000000b03f64 CTR: 0000000000000000
REGS: c00000001fddf930 TRAP: 0700   Tainted: G        W           (6.6.7-gentoo-PMacG5)
MSR:  9000000000029032 <SF,HV,EE,ME,IR,DR,RI>  CR: 24002842  XER: 00000000
IRQMASK: 0 
GPR00: 0000000000000000 c00000001fddfbd0 c0000000010dd900 0000000000000000 
GPR04: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 
GPR08: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 
GPR12: 0000000000000000 c00000000ffff700 c000000000101558 c00000001be361c0 
GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 
GPR20: 0000000000000000 0000000000000000 0000000000000000 c0003d0000348258 
GPR24: 0000000051eb851f 000000000000004a 0000000000000000 0000000000000001 
GPR28: 0000000000000000 0000000000000003 c00000001fddfc96 c0000000040c8828 
NIP [c000000000b03f68] i2c_smbus_xfer+0x178/0x190
LR [c000000000b03f64] i2c_smbus_xfer+0x174/0x190
Call Trace:
[c00000001fddfbd0] [c000000000b03f64] i2c_smbus_xfer+0x174/0x190 (unreliable)
[c00000001fddfc70] [c000000000b04274] i2c_smbus_read_word_data+0x64/0xd0
[c00000001fddfcd0] [c0003d00003bc0dc] wf_lm75_get+0x44/0xf0 [windfarm_lm75_sensor]
[c00000001fddfd00] [c0003d00000688ac] pm112_wf_notify+0x684/0x118c [windfarm_pm112]
[c00000001fddfe00] [c000000000103364] notifier_call_chain+0xa4/0x190
[c00000001fddfea0] [c00000000010387c] blocking_notifier_call_chain+0x5c/0xb0
[c00000001fddfee0] [c0003d000034ebe0] wf_thread_func+0xe8/0x190 [windfarm_core]
[c00000001fddff90] [c000000000101680] kthread+0x130/0x140
[c00000001fddffe0] [c00000000000bfb0] start_kernel_thread+0x14/0x18
Code: 39800000 4e800020 e9290018 2c290000 4082ff1c e88300e0 2c240000 4182001c 3c62fff4 3863f2b0 4b5bf379 60000000 <0fe00000> 4bfffef8 e8830090 4bffffe4 
---[ end trace 0000000000000000 ]---
------------[ cut here ]------------
No atomic I2C transfer handler for 'i2c-1'
WARNING: CPU: 1 PID: 362 at drivers/i2c/i2c-core.h:40 i2c_smbus_xfer+0x178/0x190
Modules linked in: windfarm_cpufreq_clamp windfarm_smu_sensors windfarm_smu_controls windfarm_pm112 snd_aoa_codec_onyx windfarm_pid snd_aoa_fabric_layout snd_aoa nouveau windfarm_smu_sat snd_aoa_i2sbus windfarm_lm75_sensor snd_aoa_soundbus windfarm_max6690_sensor firewire_ohci snd_pcm windfarm_core drm_exec snd_timer firewire_core crc_itu_t gpu_sched snd i2c_algo_bit backlight drm_ttm_helper ttm soundcore ohci_pci rack_meter tg3 drm_display_helper hwmon cfg80211 rfkill zram zsmalloc loop dm_mod configfs
CPU: 1 PID: 362 Comm: kwindfarm Tainted: G        W          6.6.7-gentoo-PMacG5 #1
Hardware name: PowerMac11,2 PPC970MP 0x440101 PowerMac
NIP:  c000000000b03f68 LR: c000000000b03f64 CTR: 0000000000000000
REGS: c00000001fddf8f0 TRAP: 0700   Tainted: G        W           (6.6.7-gentoo-PMacG5)
MSR:  9000000000029032 <SF,HV,EE,ME,IR,DR,RI>  CR: 24002842  XER: 00000000
IRQMASK: 0 
GPR00: 0000000000000000 c00000001fddfb90 c0000000010dd900 0000000000000000 
GPR04: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 
GPR08: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 
GPR12: 0000000000000000 c00000000ffff700 c000000000101558 c00000001be361c0 
GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 
GPR20: 0000000000000000 0000000000000000 c0003d0000348840 c0003d0000348858 
GPR24: 0000000000000000 0000000000000058 0000000000000000 0000000000000001 
GPR28: 000000000000003f 0000000000000008 c00000001fddfc56 c0000000040ca028 
NIP [c000000000b03f68] i2c_smbus_xfer+0x178/0x190
LR [c000000000b03f64] i2c_smbus_xfer+0x174/0x190
Call Trace:
[c00000001fddfb90] [c000000000b03f64] i2c_smbus_xfer+0x174/0x190 (unreliable)
[c00000001fddfc30] [c000000000b04644] i2c_smbus_read_i2c_block_data+0x84/0x120
[c00000001fddfca0] [c0003d00003374a4] wf_sat_sensor_get+0x16c/0x1a0 [windfarm_smu_sat]
[c00000001fddfd00] [c0003d00000684e8] pm112_wf_notify+0x2c0/0x118c [windfarm_pm112]
[c00000001fddfe00] [c000000000103364] notifier_call_chain+0xa4/0x190
[c00000001fddfea0] [c00000000010387c] blocking_notifier_call_chain+0x5c/0xb0
[c00000001fddfee0] [c0003d000034ebe0] wf_thread_func+0xe8/0x190 [windfarm_core]
[c00000001fddff90] [c000000000101680] kthread+0x130/0x140
[c00000001fddffe0] [c00000000000bfb0] start_kernel_thread+0x14/0x18
Code: 39800000 4e800020 e9290018 2c290000 4082ff1c e88300e0 2c240000 4182001c 3c62fff4 3863f2b0 4b5bf379 60000000 <0fe00000> 4bfffef8 e8830090 4bffffe4 
---[ end trace 0000000000000000 ]---


Kernel .config and full dmesg attached.

Regards,
Erhard
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