On Thu, 2009-11-19 at 09:54 -0500, Douglass, Woodrow wrote:
> Hi all,
>
> I'm not sure if this is the right place to post this, but I may have a
> bug report for the ath9k driver.
You may want to post to ath9k-devel@xxxxxxxxxxxxxxx, as the problem
seems to be specific to the Atheros driver.
> I'm running a single board computer with a 600Mhz celeron processor. On
> the minipci bus I have a Ubiquiti SR71-12 802.11n card.
It would be helpful if you also specified the exact version of the
kernel.
> Also attached is
> a shell script with the commands I run to cause the oops. Note that the
> first time the ifconfig line in this script is run, a "SIOCSIFFLAGS:
> Input/Output Error" is triggered, the kernel oops happens about 5
> seconds after the ifconfig line is run a second time.
I can reproduce "Input/Output Error" with SR71-12, but not the oops with
the current linux-wireless.
I know that it's caused by returning false in this code in file
drivers/net/wireless/ath/ath9k/calib.c, function ath9k_hw_init_cal():
/* Poll for offset calibration complete */
if (!ath9k_hw_wait(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_CAL,
0, AH_WAIT_TIMEOUT)) {
ath_print(common, ATH_DBG_CALIBRATE,
"offset calibration failed to "
"complete in 1ms; noisy environment?\n");
return false;
}
With full debugging (modprobe ath9k debug=0xffffffff), the kernel
messages are (with some context):
ath: Reset TXQ, inactive queue: 7
ath: Reset TX queue: 8
ath: tx ok 0x0 err 0x0 desc 0x10f eol 0x10f urn 0x0
ath: Reset TX queue: 9
ath: tx ok 0x0 err 0x0 desc 0x10f eol 0x10f urn 0x0
ath: ah->misc_mode 0x4
ath: timeout (100000 us) on reg 0x9860: 0xdeadbeef & 0x00000001 != 0x00000000
ath: offset calibration failed to complete in 1ms; noisy environment?
ath: Unable to reset hardware; reset status -5 (freq 2412 MHz)
I have access to various Ubiquiti cards, but SR71-12 is the only one
that fails. I know that it works in Windows XP with the Ubiquiti driver
for other SR71 cards (the inf file should be tweaked to recognize the
revision of SR71-12). That makes me think the problem is not in the
hardware and not in the noisy environment.
ath9k identifies the card as:
phy0: Atheros AR9280 Rev:2 mem=0xffffc90010da0000, irq=18
# lspci -vnn -s 03:01.0
03:01.0 Network controller [0280]: Atheros Communications Inc. AR922X
Wireless Network Adapter [168c:0029] (rev 01)
Subsystem: Device [0777:4002]
Flags: bus master, 66MHz, medium devsel, latency 168, IRQ 18
Memory at fe3f0000 (32-bit, non-prefetchable) [size=64K]
Capabilities: [44] Power Management version 2
Kernel driver in use: ath9k
Kernel modules: ath9k
--
Regards,
Pavel Roskin
--
To unsubscribe from this list: send the line "unsubscribe linux-wireless" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
