Re: [ath5k-devel] kernel panic on MIPS + ath5k + Wistron CM9 radio

[Russell Senior <seniorr@aracnet.com>]

>>>>> "Felix" == Felix Fietkau <nbd@openwrt.org> writes:

>> Well, I see the same on FreeBSD/MIPS whenever an Atheros device is
>> fondled incorrectly. Either because the chip isn't yet fully awake
>> or the register plainly doesn't exist.
>> 
>> See if you can add some debugging in ath5k_hw_reset_tx_queue() to
>> see which register is being read/written before the PCI bus error
>> occurs.

Felix> If I read the trace correctly, the accessed register is 0x111c,
Felix> which is AR5K_QUEUE_DFS_MISC(7). If I remember correctly, queue
Felix> 7 is the beacon queue. Access to this register should never
Felix> fail unless the hardware is in sleep mode, or there is some
Felix> other PCI related issue. Unfortunately, this issue might be
Felix> caused by something entirely different that is not visible in
Felix> the stack trace. I have observed that messing up the internal
Felix> state of a PCI card can trigger an error that only shows up
Felix> much later and thus can only be found by doing a thorough code
Felix> review or by analyzing PCI traces.

I wonder what is special about MIPS (relative to x86, where I don't
see the panics).


-- 
Russell Senior         ``I have nine fingers; you have ten.''
seniorr@aracnet.com