[Fwd: [Bug 7431] New: ohci1394 Oops after a rmmod/modprobe cycle]

[Stefan Richter <stefanr@s5r6.in-berlin.de>]

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Hi list,
there was a bug report on ohci1394 which seems to be related to the
platform-specific code in the driver. Additional details were posted on
linux1394-user:
http://thread.gmane.org/gmane.linux.kernel.firewire.user/focus=2120
Subject: "strange interaction: ohci1394 and backlight on iBook"
Any ideas? Thanks,
-- 
Stefan Richter
-=====-=-==- =-== --=-=
http://arcgraph.de/sr/

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From: bugme-daemon@bugzilla.kernel.org
To: stefan-r-bz@s5r6.in-berlin.de
Subject: [Bug 7431] New: ohci1394 Oops after a rmmod/modprobe cycle
Date: Sun, 29 Oct 2006 17:24:53 -0800
Message-ID: <200610300124.k9U1Orae030173@fire-2.osdl.org>

http://bugzilla.kernel.org/show_bug.cgi?id=7431

           Summary: ohci1394 Oops after a rmmod/modprobe cycle
    Kernel Version: 2.6.18 (gentoo-sources-2.6.18)
            Status: NEW
          Severity: normal
             Owner: drivers_ieee1394@kernel-bugs.osdl.org
         Submitter: dev@gioelebarabucci.com


Distribution: Gentoo
Hardware Environment: PPC iBook G3 (PowerBook4,3)
Problem Description:

When I 'rmmod ohci1394' and then 'modprobe ohci1394', I get a "Bus error" 
message from modprobe and my backlight is set to full brightness.
dmesg reveals that an oops occurred. Here is the dmesg output after 'modprobe 
ohci1394':

| Machine check in kernel mode.
| Caused by (from SRR1=49030): Transfer error ack signal
| Oops: Machine check, sig: 7 [#1]
|
| Modules linked in: ohci1394 ipv6 af_packet radeon drm snd_seq snd_seq_device 
snd_powermac ide_cd cdrom snd_aoa_i2sbus snd_pcm airport snd_timer 
snd_page_alloc snd orinoco soundcore hermes snd_aoa_soundbus sungem ieee1394 
ohci_hcd usbcore uninorth_agp sungem_phy agpgart evdev unix
| NIP: EA08D29C LR: EA091618 CTR: C002CCB0
| REGS: cd533c80 TRAP: 0200   Not tainted  (2.6.18-gentoo)
| MSR: 00049030 <EE,ME,IR,DR>  CR: 24004482  XER: 00000000
| TASK = cd947850[8127] 'modprobe' THREAD: cd532000
| GPR00: FFFFFFFF CD533D30 CD947850 CB2B9E68 EA08E094 CB2B9F44 CC1BD7FC 
00000000
| GPR08: 0000001F EA084000 000007C0 EA084000 84004488 1001F288 0000001D 
EA08B13C
| GPR16: E7454AE0 EA0886D4 00000124 00000000 C0045298 EA088148 EA088724 
EA090000
| GPR24: CB2B8000 CB2B9EE8 CB2B9FA0 CB2B9E8C CB2B9F44 C79BA000 CB2B9E68 
00000000
| NIP [EA08D29C] ohci_soft_reset+0x50/0x78 [ohci1394]
| LR [EA091618] ohci1394_pci_probe+0x2f4/0xb90 [ohci1394]
| Call Trace:
| [CD533D30] [C79BA000] 0xc79ba000 (unreliable)
| [CD533D40] [EA091618] ohci1394_pci_probe+0x2f4/0xb90 [ohci1394]
| [CD533DA0] [C00F755C] pci_device_probe+0x84/0xa4
| [CD533DC0] [C014EE88] driver_probe_device+0x60/0x118
| [CD533DE0] [C014F0C0] __driver_attach+0xcc/0xf8
| [CD533E00] [C014E764] bus_for_each_dev+0x58/0x94
| [CD533E30] [C014ED9C] driver_attach+0x24/0x34
| [CD533E40] [C014E2CC] bus_add_driver+0x88/0x164
| [CD533E60] [C014F36C] driver_register+0x70/0xb8
| [CD533E70] [C00F7378] __pci_register_driver+0x4c/0x8c
| [CD533E80] [E900D020] ohci1394_init+0x20/0x60 [ohci1394]
| [CD533E90] [C0046214] sys_init_module+0x170/0x1544
| [CD533F40] [C000F2FC] ret_from_syscall+0x0/0x38
| --- Exception: c01 at 0xff3caac
|    LR = 0x10002e84
| Instruction dump:
| 7c0004ac 7d20052c 3be00000 48000014 4800570d 2f9f0063 3bff0001 419e0028
| 813e0008 38090050 7c0004ac 7c00042c <0c000000> 4c00012c 74090001 386003e8

Steps to reproduce:
* rmmod ohci1394
* modprobe ohci1394

In addition, it is impossible now to remove the ohci1394 module:
| # rmmod ohci1394
| ERROR: Module ohci1394 is in use

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