Quoting Pavel Roskin <[email protected]>:
> On Fri, 2010-03-05 at 15:04 -0800, Mark Sutton wrote:
>
>> Is it possible this is a hardware issue?
>
> It looks like a hardware issue, but maybe it can be worked around.
>
>> BUG: soft lockup - CPU#0 stuck for 61s! [phy0:604]
>> Modules linked in: usbhid hid nvidia(P) acpi_cpufreq cpufreq_stats
>> cpufreq_userspace cpufreq_ondemand cpufreq_powersave freq_table
>> cpufreq_conservative lm90 adm1021 arc4 ecb snd_intel8x0
>> snd_ac97_codec ac97_bus snd_pcm ath9k pcmcia snd_seq mac80211
>> snd_timer yenta_socket snd_seq_device ath fan rsrc_nonstatic
>> uhci_hcd thermal cfg80211 video snd processor toshiba_acpi
>> pcmcia_core ehci_hcd thermal_sys led_class rtc_cmos e100 soundcore
>> rtc_core battery ac evdev hwmon mii rtc_lib output rfkill
>> snd_page_alloc intel_agp usbcore psmouse agpgart button
>>
>> Pid: 604, comm: phy0 Tainted: P (2.6.32.7 #4) Portable PC
>> EIP: 0060:[<c0294d02>] EFLAGS: 00000296 CPU: 0
>> EIP is at ioread32+0x32/0x40
>> EAX: 00000000 EBX: edc40000 ECX: f0c40000 EDX: f0c48258
>> ESI: edc40000 EDI: 00001000 EBP: 00000000 ESP: ed899d24
>> DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068
>> CR0: 8005003b CR2: b7868000 CR3: 27fc7000 CR4: 000006d0
>> DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
>> DR6: ffff0ff0 DR7: 00000400
>> Call Trace:
>> [<f0bfc656>] ? ath9k_hw_procmibevent+0x36/0x140 [ath9k]
>
> I believe the register number is in DX. Register 0x8258 is
> AR_SLP_MIB_CTRL, and it's indeed being read in ath9k_hw_procmibevent().
> Somehow reading that register causes a CPU lockup.
>
> An easy workaround would be to comment out this line in ani.c:
>
> if (!(REG_READ(ah, AR_SLP_MIB_CTRL) & AR_SLP_MIB_PENDING))
>
> Leave the new line so that the register is cleared unconditionally.
I've been running a 2.6.33.1 with this one line modification and I haven't
seen a single system hang anymore. My wlan device is sold as D-Link DWA-645:
03:00.0 Network controller: Atheros Communications Inc. AR5008
Wireless Network Adapter (rev 01)
Subsystem: Device 07d1:3a09
Flags: bus master, 66MHz, medium devsel, latency 168, IRQ 11
Memory at 4c000000 (32-bit, non-prefetchable) [size=64K]
Capabilities: [40] #80 [0000]
Kernel driver in use: ath9k
Kernel modules: ath9k
Without this patch I would get a ath9k based hang in a 3-4 days time
eventually.
The hang could be solved usually by unplugging and re-plugging the
pcmcia card.
Regards,
Tomi Orava
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