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

h2o-post Mon, 06 Jun 2011 17:46:36 -0700

Hi all,

I tested the lastest Openwrt backfire commit b5a33bb5d58805d5b1d84a4cf47feeca52984705

RS-pro + CM9 + sta/ap = working
RS-pro + CM9 + adhoc = kernel oops
    PCI error 1 at PCI addr 0x10008020
    Data bus error, epc == 870c6b24, ra == 870c6b20
    Oops[#1]:

and I tested OpenWrt from 19.April commit f3a65e72dbe5884ceb0f421429ce0d1f29fcb8fa
    same result.

further troubleshooting attempts without success:

    1.) - vanilla OpenWrt madwifi works fine in adhoc mode

    2.) - change DMASIZE via this patch:

Index: compat-wireless-2011-05-27/drivers/net/wireless/ath/ath5k/dma.c
===================================================================
--- compat-wireless-2011-05-27.orig/drivers/net/wireless/ath/ath5k/dma.c    2011-06-06 17:37:37.000000000 +0200
+++ compat-wireless-2011-05-27/drivers/net/wireless/ath/ath5k/dma.c    2011-06-07 00:09:23.000000000 +0200
@@ -789,13 +789,13 @@
     if (ah->ah_version != AR5K_AR5210) {
#ifndef CONFIG_ATHEROS_AR71XX
         AR5K_REG_WRITE_BITS(ah, AR5K_TXCFG,
-            AR5K_TXCFG_SDMAMR, AR5K_DMASIZE_128B);
+            AR5K_TXCFG_SDMAMR, AR5K_DMASIZE_4B);
         AR5K_REG_WRITE_BITS(ah, AR5K_RXCFG,
-            AR5K_RXCFG_SDMAMW, AR5K_DMASIZE_128B);
+            AR5K_RXCFG_SDMAMW, AR5K_DMASIZE_4B);
#else
         /* WAR for AR71xx PCI bug */
         AR5K_REG_WRITE_BITS(ah, AR5K_TXCFG,

Index: compat-wireless-2011-05-27/drivers/net/wireless/ath/ath5k/initvals.c
===================================================================
--- compat-wireless-2011-05-27.orig/drivers/net/wireless/ath/ath5k/initvals.c    2011-06-06 17:37:37.000000000 +0200
+++ compat-wireless-2011-05-27/drivers/net/wireless/ath/ath5k/initvals.c    2011-06-07 00:09:54.000000000 +0200
@@ -59,11 +59,11 @@
     { AR5K_IER,        AR5K_IER_DISABLE },
     { AR5K_BSR,        0, AR5K_INI_READ },
#ifndef CONFIG_ATHEROS_AR71XX
-    { AR5K_TXCFG,        AR5K_DMASIZE_128B },
-    { AR5K_RXCFG,        AR5K_DMASIZE_128B },
+    { AR5K_TXCFG,        AR5K_DMASIZE_4B },
+    { AR5K_RXCFG,        AR5K_DMASIZE_4B },
#else
     /* WAR for AR71xx PCI bug */

Bye Bluse

Sedat Dilek
31. Mai 2011 20:16

On Tue, May 31, 2011 at 7:30 PM, Russell Senior

Just FYI:
Nick sent the patch from [1] to linux-wireless ML a few weeks ago.

- Sedat -

[1] http://www.kernel.org/pub/linux/kernel/people/mickflemm/01-fast-chan-switch-modparm
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Russell Senior
31. Mai 2011 19:30

Russell> I just confirmed Peizhao Hu's observation. The CM9's with
Russell> chips marked AR5213A-001 panic on MIPS. CM9's with chips
Russell> marked AR5213A-00 do not. It looks like (from my small
Russell> sample immediately at hand) the stock radios on Netgear
Russell> WGT634U also are marked AR5213A-00, and don't seem to panic.

Seems to be fixed in OpenWrt r27024. Thanks Felix!

https://dev.openwrt.org/changeset/27024/

Russell Senior
7. Mai 2011 03:30
"Felix" == Felix Fietkau <n...@openwrt.org> writes:
Felix> On 2011-05-04 4:39 PM, Russell Senior wrote:
"Russell" == Russell Senior<seni...@aracnet.com> writes:
Russell> Recently trying to abandon madwifi for good on some embedded
Russell> devices with OpenWrt, encountered kernel panics.  Same radio
Russell> on an x86 platform (Soekris net4826), no kernel panic.
Russell> Different atheros radio, no kernel panic.  Tried two
Russell> different MIPS boards (Netgear WGT634U and Ubiquiti
Russell> RouterStation), both panic'd.
Russell> Netgear WGT634U: http://pastebin.ca/2051127 Ubiquiti
Russell> RouterStation: http://pastebin.ca/2052610
 Here is another panic, this time not resulting from hostapd, but
from an adhoc vif:
http://pastebin.ca/2053827

The initial panic appears to occur in a different function from the
hostapd initiated panics:
Felix> Again a beacon related register, this time AR5K_BEACON

I just confirmed Peizhao Hu's observation.  The CM9's with chips
marked AR5213A-001 panic on MIPS.  CM9's with chips marked AR5213A-00
do not.  It looks like (from my small sample immediately at hand) the
stock radios on Netgear WGT634U also are marked AR5213A-00, and don't
seem to panic.

Maybe our Atheros friends can tell us what the differences between
these two chips are?
Felix Fietkau
4. Mai 2011 16:47

Again a beacon related register, this time AR5K_BEACON

- Felix
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Russell Senior
4. Mai 2011 16:39

Russell> Recently trying to abandon madwifi for good on some embedded
Russell> devices with OpenWrt, encountered kernel panics. Same radio
Russell> on an x86 platform (Soekris net4826), no kernel panic.
Russell> Different atheros radio, no kernel panic. Tried two
Russell> different MIPS boards (Netgear WGT634U and Ubiquiti
Russell> RouterStation), both panic'd.

Russell> Netgear WGT634U: http://pastebin.ca/2051127 Ubiquiti
Russell> RouterStation: http://pastebin.ca/2052610

Here is another panic, this time not resulting from hostapd, but from
an adhoc vif:

http://pastebin.ca/2053827

The initial panic appears to occur in a different function from the
hostapd initiated panics:

PCI error 1 at PCI addr 0x10008020
Data bus error, epc == 83006b24, ra == 83006b20
Oops[#1]:
Cpu 0
$ 0 : 00000000 802f0000 deadc0de 00000002
$ 4 : b0008020 00000002 018003e8 00000000
$ 8 : 830a8228 00000015 83ad8df0 0000006c
$12 : 00000001 0000000c 00000005 00000008
$16 : 8387a000 01000000 00008020 00008024
$20 : 0000802c 00008030 018003e8 000003e9
$24 : 00000008 0000021c
$28 : 83832000 83833b70 0000003b 83006b20
Hi : 00000000
Lo : 00000020
epc : 83006b24 ath5k_hw_reset_tsf+0x48/0x98 [ath5k]
Not tainted
ra : 83006b20 ath5k_hw_reset_tsf+0x44/0x98 [ath5k]
Status: 1000f403 KERNEL EXL IE
Cause : 1080001c
PrId : 00019374 (MIPS 24Kc)
Modules linked in: batman_adv ath5k ath mac80211 cfg80211 compat arc4 aes_generic crypto_algapi ipv6 leds_gpio gpio_keys_polled input_polldev input_core
Process kworker/u:0 (pid: 5, threadinfo=83832000, task=83819100, tls=00000000)
Stack : 00000000 00000001 00000000 00000000 000000d0 8387a000 00008034 00001f30
00001ef0 83006d28 00000008 000200d0 0000ed54 800ade3c 83ad8da0 83ad8da0
018003e8 00000000 00000000 000003e8 00000000 0000ed54 00000000 830113cc
00000002 802c74fc 00000000 80099364 00000000 00000000 00000000 000252d0
000000d0 00000001 802c74f8 003fffff 8387a000 00000000 0000021c 83845300
...
Call Trace:
[<83006b24>] ath5k_hw_reset_tsf+0x48/0x98 [ath5k]
[<83006d28>] ath5k_hw_init_beacon+0x1b4/0x250 [ath5k]
[<830113cc>] ath5k_beacon_update_timers+0x248/0xc8c [ath5k]
[<83bc81f8>] ieee80211_process_addba_request+0x520/0xa44 [mac80211]

Code: 0c058bb8 00442021 8e0500e4 <00518825> 02601021 0245100b 00402821 8e0200d4 02202021
[...]

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

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