ath9k_htc issues on beaglebone

[Ian Downard]

I'm having problems using the ath9k_htc on a Beaglebone with a TP-Link
WN722N usb wifi adapter running Angstrom Linux and the 3.13.1 kernel.
I can get wlan0 to come up, join a secured access point, and run
normally for about 30 minutes, but always between 28 and 30 minutes,
the interface goes down, and I get the following error in dmesg:

[  962.531494]       Not tainted 3.13.1+ #1
[  962.535789] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[  962.545092] INFO: task wpa_supplicant:366 blocked for more than 120 seconds.
[  962.552559]       Not tainted 3.13.1+ #1
[  962.556781] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.


Any command that interacts with wlan0 will subsequently hang, such as
ifconfig, iwconfig, wpa_supplicant, etc.

I've posted my dmesg here:
http://pastebin.com/raw.php?i=WaF3NSZ3

And I've posted a typescript file containing verbose debug output from
wpa_supplicant here:
http://pastebin.com/raw.php?i=GVr1rb0Y

lsmod excerpt says this:

ath9k_htc              76887  0
mac80211              457028  1 ath9k_htc
ath9k_common            2725  1 ath9k_htc
ath9k_hw              429016  2 ath9k_common,ath9k_htc
ath                    19907  3 ath9k_common,ath9k_htc,ath9k_hw
cfg80211              407564  3 ath,mac80211,ath9k_htc


lsusb excerpt says this:

Bus 002 Device 002: ID 0cf3:9271 Atheros Communications, Inc. AR9271 802.11n


I'm using the ath9 drivers which are included in the 3.13 kernel,
which I downloaded from git://github.com/beagleboard/kernel.git and
compiled myself.

I'm also using htc_9271.fw firmware which I downloaded from
https://github.com/qca/open-ath9k-htc-firmware and compiled myself.

Does anyone know what else I could do to troubleshoot this problem?

Thanks in advance for any suggestions!