Heads up: segfault with snd-powermac on 2.6.16

[ecatmur]

This is just a heads up, I managed to find the fix.

When booting, when the kernel loads the snd-powermac module I get a segfault:

Unable to handle kernel paging request for data at address 0x00000002
Faulting instruction address: 0xc01a302c
Oops: Kernel access of bad area, sig: 11 [#1]
Modules linked in: snd_powermac snd_pcm_oss snd_mixer_oss snd_pcm snd_timer snd soundcore snd_page_alloc binfmt_misc ipv6 rfcomm l2cap nls_utf8 ext3 jbd mbcache dm_snapshot dm_crypt fuse usblp apm_emu vfat fat hfsplus therm_adt746x sr_mod sbp2 scsi_mod eth1394 hci_usb bluetooth evdev tsdev ohci1394 ieee1394 uninorth_agp agpgart dm_mod xfs exportfs usbhid ehci_hcd sungem sungem_phy ohci_hcd usbcore ide_disk ide_cd cdrom
NIP: C01A302C LR: E45A93F4 CTR: C01A3000
REGS: d999fcc0 TRAP: 0300 Not tainted (2.6.16-rc5-powerpc)
MSR: 00009032 <EE,ME,IR,DR> CR: 22008444 XER: 20000000
DAR: 00000002, DSISR: 40000000
TASK = d9f3c0f0[3587] 'modprobe' THREAD: d999e000
GPR00: E45A93F4 D999FD70 D9F3C0F0 00000000 00000001 00000060 00000000 00000001
GPR08: 00000002 00000000 C0018C2C C01A3000 00000000 1001E638 00000000 00000000
GPR16: 00000000 00000000 100013D0 1001F2B0 3002A000 00000003 00000000 00000000
GPR24: 10021C00 00000000 1001FBAC DFC95800 DD6A1560 0000000A E45B2504 E45AC580
NIP [C01A302C] i2c_smbus_write_byte_data+0x2c/0x50
LR [E45A93F4] send_init_client+0x30/0x90 [snd_powermac]
Call Trace:
[D999FD70] [C0053C80] setup_irq+0x12c/0x148 (unreliable)
[D999FDB0] [E45A93F4] send_init_client+0x30/0x90 [snd_powermac]
[D999FDD0] [E454FF00] snd_pmac_tumbler_post_init+0x30/0x68 [snd_powermac]
[D999FDE0] [E454E228] snd_pmac_probe+0x1a8/0x324 [snd_powermac]
[D999FE10] [C017D740] platform_drv_probe+0x20/0x30
[D999FE20] [C017B734] driver_probe_device+0x98/0x100
[D999FE40] [C017ABD0] bus_for_each_drv+0x50/0x98
[D999FE70] [C017B80C] device_attach+0x6c/0xa8
[D999FE90] [C017AC50] bus_add_device+0x38/0xf4
[D999FEB0] [C0179964] device_add+0xe0/0x174
[D999FED0] [C017D58C] platform_device_add+0x118/0x160
[D999FEF0] [C017DB18] platform_device_register_simple+0x4c/0x78
[D999FF10] [E454E044] alsa_card_pmac_init+0x44/0x80 [snd_powermac]
[D999FF20] [C004BAF0] sys_init_module+0x15c/0x2c0
[D999FF40] [C000FF3C] ret_from_syscall+0x0/0x40
--- Exception: c01 at 0xff6e708
LR = 0x10003e30
Instruction dump:
4e800020 7c0802a6 9421ffc0 7c691b78 7c872378 38c00000 39000002 98a10008
90010044 60000000 60000000 60000000 <a0a30002> a0890004 39210008 80630008

The solution is to load the i2c-powermac before snd-powermac (place it before snd-powermac in /etc/modules.autoload.d/kernel-2.6).
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