Hello,
I've spent some time on ath9k driver getting stuck.
I set up a new system with OpenWRT, and the atheros AR922X had the problem.
I've gone through http://linuxwireless.org/en/users/Drivers/ath9k/bugs,
and decided to give a go around with newer driver.
I went the route of Debian wheezy, so that I can use the updated
compat-wireless more easily.
The current system is
Linux ntai11d 3.1.0-1-486 #1 Sun Dec 11 19:52:34 UTC 2011 i586 GNU/Linux
# cat /etc/debian_version
wheezy/sid
I downloaded/compiled the compat-wireless-3.1.1-1.tar.bz2, installed the
modules, set up the hostapd.
wlan0 is running the master mode with hostapd, and I can establish the
connection from a laptop.
wlan0 is bridged to eth0, and works fine. It runs OK until I put it
under stress.
As soon as I do something like scp to transfer a file, it chokes up with
the DML issue.
Both the openwrt, debian get stuck the same way.
Dec 30 01:11:06 ntai11d kernel: [ 1191.038064] ath: Failed to stop TX DMA!
Dec 30 01:11:06 ntai11d kernel: [ 1191.057713] ath: DMA failed to stop
in 10 ms AR_CR=0x00000024 AR_DIAG_SW=0x42000020 DMADBG_7=0x00006040
Dec 30 01:11:06 ntai11d kernel: [ 1191.073555] ath: Could not stop RX,
we could be confusing the DMA engine when we start RX up
Dec 30 01:11:06 ntai11d kernel: [ 1191.109949] ath: DMA failed to stop
in 10 ms AR_CR=0x00000024 AR_DIAG_SW=0x42000020 DMADBG_7=0x00008040
Dec 30 01:11:06 ntai11d kernel: [ 1191.125908] ath: Could not stop RX,
we could be confusing the DMA engine when we start RX up
It continues until I stop the hostapd. Once this happens, the wifi
connection dies.
# lspci -nn | grep -i atheros
00:07.0 Network controller [0280]: Atheros Communications Inc. AR922X
Wireless Network Adapter [168c:0029] (rev 01)
Here is the system from dmidecode.
As you can see, this is a Geode LX, 500MHz system I ebayed.
It has a CompactFlash, mini PCI slot and 2 ethernet ports.
# dmidecode 2.11
SMBIOS 2.3 present.
30 structures occupying 909 bytes.
Table at 0x000F0000.
Handle 0x0000, DMI type 0, 20 bytes
BIOS Information
Vendor: Phoenix Technologies, LTD
Version: 6.00 PG
Release Date: 06/01/2007
Address: 0xE0000
Runtime Size: 128 kB
ROM Size: 512 kB
Characteristics:
ISA is supported
PCI is supported
PNP is supported
APM is supported
BIOS is upgradeable
BIOS shadowing is allowed
Boot from CD is supported
Selectable boot is supported
BIOS ROM is socketed
EDD is supported
5.25"/360 kB floppy services are supported (int 13h)
5.25"/1.2 MB floppy services are supported (int 13h)
3.5"/720 kB floppy services are supported (int 13h)
3.5"/2.88 MB floppy services are supported (int 13h)
Print screen service is supported (int 5h)
8042 keyboard services are supported (int 9h)
Serial services are supported (int 14h)
Printer services are supported (int 17h)
CGA/mono video services are supported (int 10h)
ACPI is supported
BIOS boot specification is supported
Handle 0x0001, DMI type 1, 25 bytes
System Information
Manufacturer: MICRO-STAR INTERNATIONAL CO., LTD
Product Name: MS-9801
Version: 1.0A
Serial Number:
UUID: Not Present
Wake-up Type: Power Switch
Handle 0x0002, DMI type 2, 8 bytes
Base Board Information
Manufacturer: MICRO-STAR INTERNATIONAL CO., LTD
Product Name: MS-9801
Version: 1.0A
Serial Number:
Handle 0x0003, DMI type 4, 35 bytes
Processor Information
Socket Designation: Geode LX
Type: Central Processor
Family: 80486
Manufacturer: AMD
ID: A2 05 00 00 3D A9 88 00
Signature: Type 0, Family 5, Model 10, Stepping 2
Version: Geode GX-MMX
Voltage: 3.3 V
External Clock: 64 MHz
Max Speed: 500 MHz
Current Speed: 500 MHz
Status: Populated, Enabled
Upgrade: ZIF Socket
L1 Cache Handle: 0x0007
L2 Cache Handle: 0x0008
L3 Cache Handle: Not Provided
Serial Number:
Asset Tag:
Part Number:
-- Tai
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