Hello,
My card is: TP-LINK Model No. TL-WN951N Ver 1.0 that shows as:
phy0: Atheros AR5416 MAC/BB Rev:2 AR2133 RF Rev:81: mem=0xf8ee0000, irq=20
and lspci:
05:05.0 Network controller: Atheros Communications Inc. AR5416 Wireless Network Adapter [AR5008 802.11(a)bgn] (rev 01)
??? Subsystem: Atheros Communications Inc. Device 3071
??? Flags: bus master, 66MHz, medium devsel, latency 168, IRQ 20
??? Memory at febc0000 (32-bit, non-prefetchable) [size=64K]
??? Capabilities: [40] #80 [0000]
??? Kernel driver in use: ath9k
It works in STA mode in my debian squeeze with kernel 2.6.32-48 but not very well in AP mode given that,
as soon as hostapd is run to go AP mode I get:
Jun 16 12:33:33 hostname kernel: [?? 88.176476] irq 16: nobody cared (try booting with the "irqpoll" option)
Jun 16 12:33:33 hostname kernel: [?? 88.176560] Pid: 0, comm: swapper Not tainted 2.6.32-5-686 #1
Jun 16 12:33:33 hostname kernel: [?? 88.176565] Call Trace:
Jun 16 12:33:33 hostname kernel: [?? 88.176578]? [<c106db4d>] ? __report_bad_irq+0x24/0x69
Jun 16 12:33:33 hostname kernel: [?? 88.176587]? [<c106db54>] ? __report_bad_irq+0x2b/0x69
Jun 16 12:33:33 hostname kernel: [?? 88.176595]? [<c106dc79>] ? note_interrupt+0xe7/0x13e
Jun 16 12:33:33 hostname kernel: [?? 88.176603]? [<c106e1a7>] ? handle_fasteoi_irq+0x7a/0x97
Jun 16 12:33:33 hostname kernel: [?? 88.176612]? [<c1004dd7>] ? handle_irq+0x17/0x1b
Jun 16 12:33:33 hostname kernel: [?? 88.176620]? [<c1004659>] ? do_IRQ+0x38/0x89
Jun 16 12:33:33 hostname kernel: [?? 88.176628]? [<c10037f0>] ? common_interrupt+0x30/0x38
Jun 16 12:33:33 hostname kernel: [?? 88.176637]? [<c10088d3>] ? mwait_idle+0x62/0x6c
Jun 16 12:33:33 hostname kernel: [?? 88.176645]? [<c1002377>] ? cpu_idle+0x89/0xa2
Jun 16 12:33:33 hostname kernel: [?? 88.176649] handlers:
Jun 16 12:33:33 hostname kernel: [?? 88.176704] [<f7ec4277>] (ata_sff_interrupt+0x0/0xa2 [libata])
Jun 16 12:33:33 hostname kernel: [?? 88.176844] [<f7f169ad>] (usb_hcd_irq+0x0/0x71 [usbcore])
Jun 16 12:33:33 hostname kernel: [?? 88.176970] [<f7c676bc>] (rtl8169_interrupt+0x0/0x342 [r8169])
Jun 16 12:33:33 hostname kernel: [?? 88.177092] Disabling IRQ #16
and the wireless card stops working.
As a workaround, I've been running the kernel with "irqpoll/irqfixup" option but now I needed to migrate to debian wheezy
with kernel 3.2.46-1. With this version, kernel shows a similar error:
Jun 16 17:37:27 hostname kernel: [16005.334858] irq 16: nobody cared (try booting with the "irqpoll" option)
Jun 16 17:37:27 hostname kernel: [16005.335085] Pid: 0, comm: swapper/1 Not tainted 3.2.0-4-686-pae #1 Debian 3.2.46-1
Jun 16 17:37:27 hostname kernel: [16005.335094] Call Trace:
Jun 16 17:37:27 hostname kernel: [16005.335117]? [<c1078f57>] ? __report_bad_irq+0x1c/0x8d
Jun 16 17:37:27 hostname kernel: [16005.335132]? [<c107925a>] ? note_interrupt+0x11a/0x188
Jun 16 17:37:27 hostname kernel: [16005.335146]? [<c1077be0>] ? handle_irq_event_percpu+0x13f/0x155
Jun 16 17:37:27 hostname kernel: [16005.335160]? [<c107980a>] ? handle_level_irq+0x56/0x56
Jun 16 17:37:27 hostname kernel: [16005.335173]? [<c1077c17>] ? handle_irq_event+0x21/0x3a
Jun 16 17:37:27 hostname kernel: [16005.335186]? [<c107980a>] ? handle_level_irq+0x56/0x56
Jun 16 17:37:27 hostname kernel: [16005.335199]? [<c107986a>] ? handle_fasteoi_irq+0x60/0x85
Jun 16 17:37:27 hostname kernel: [16005.335207]? <IRQ>? [<c100c886>] ? do_IRQ+0x2e/0x76
Jun 16 17:37:27 hostname kernel: [16005.335231]? [<c12c84f0>] ? common_interrupt+0x30/0x38
Jun 16 17:37:27 hostname kernel: [16005.335245]? [<c103007b>] ? update_group_power+0x67/0xbf
Jun 16 17:37:27 hostname kernel: [16005.335260]? [<c1199de9>] ? intel_idle+0xcc/0xfb
Jun 16 17:37:27 hostname kernel: [16005.335274]? [<c120cc62>] ? cpuidle_idle_call+0xcc/0x142
Jun 16 17:37:27 hostname kernel: [16005.335287]? [<c100ace9>] ? cpu_idle+0x8b/0xaf
Jun 16 17:37:27 hostname kernel: [16005.335302]? [<c12ba6e6>] ? start_secondary+0x1be/0x1c3
Jun 16 17:37:27 hostname kernel: [16005.335311] handlers:
Jun 16 17:37:27 hostname kernel: [16005.335435] [<f84d1eca>] ata_bmdma_interrupt
Jun 16 17:37:27 hostname kernel: [16005.335599] [<f846b4d5>] usb_hcd_irq
Jun 16 17:37:27 hostname kernel: [16005.335734] [<f827321f>] rtl8169_interrupt
Jun 16 17:37:27 hostname kernel: [16005.335869] Disabling IRQ #16
but hangs completely showing traces in console and needing a hard reboot.
If I apply same workaround booting the kernel with "irqpoll/irqfixup" I can go AP mode, but as soon as a station tries to connect,
I get these messages flooding logs and AP doesn't work at all (I have to ifdown the interface to stop log flooding):
Jun 16 18:09:50 hostname kernel: [? 170.379181] ath: DMA failed to stop in 10 ms AR_CR=0x00000024 AR_DIAG_SW=0x42000020 DMADBG_7=0x000264c0
Jun 16 18:09:50 hostname kernel: [? 170.388883] ath: Could not stop RX, we could be confusing the DMA engine when we start RX up
Jun 16 18:09:50 hostname kernel: [? 170.744131] ath: DMA failed to stop in 10 ms AR_CR=0x00000024 AR_DIAG_SW=0x42000020 DMADBG_7=0x00006040
Jun 16 18:09:50 hostname kernel: [? 170.753829] ath: Could not stop RX, we could be confusing the DMA engine when we start RX up
Jun 16 18:09:50 hostname kernel: [? 171.109084] ath: DMA failed to stop in 10 ms AR_CR=0x00000024 AR_DIAG_SW=0x42000020 DMADBG_7=0x00006040
Jun 16 18:09:50 hostname kernel: [? 171.118791] ath: Could not stop RX, we could be confusing the DMA engine when we start RX up
Jun 16 18:09:51 hostname kernel: [? 171.474058] ath: DMA failed to stop in 10 ms AR_CR=0x00000024 AR_DIAG_SW=0x42000020 DMADBG_7=0x00006040
Jun 16 18:09:51 hostname kernel: [? 171.483760] ath: Could not stop RX, we could be confusing the DMA engine when we start RX up
Jun 16 18:09:51 hostname kernel: [? 171.838977] ath: DMA failed to stop in 10 ms AR_CR=0x00000024 AR_DIAG_SW=0x42000020 DMADBG_7=0x00006040
Jun 16 18:09:51 hostname kernel: [? 171.848685] ath: Could not stop RX, we could be confusing the DMA engine when we start RX up
Jun 16 18:09:52 hostname kernel: [? 172.203898] ath: DMA failed to stop in 10 ms AR_CR=0x00000024 AR_DIAG_SW=0x42000020 DMADBG_7=0x00006040
Jun 16 18:09:52 hostname kernel: [? 172.213600] ath: Could not stop RX, we could be confusing the DMA engine when we start RX up
Jun 16 18:09:52 hostname kernel: [? 172.568817] ath: DMA failed to stop in 10 ms AR_CR=0x00000024 AR_DIAG_SW=0x42000020 DMADBG_7=0x00006040
Jun 16 18:09:52 hostname kernel: [? 172.578515] ath: Could not stop RX, we could be confusing the DMA engine when we start RX up
Jun 16 18:09:52 hostname kernel: [? 172.933750] ath: DMA failed to stop in 10 ms AR_CR=0x00000024 AR_DIAG_SW=0x42000020 DMADBG_7=0x00006040
Jun 16 18:09:52 hostname kernel: [? 172.943450] ath: Could not stop RX, we could be confusing the DMA engine when we start RX up
...
...
Jun 16 18:10:12 hostname kernel: [? 192.683280] ath: Failed to stop TX DMA, queues=0x001!
Jun 16 18:10:12 hostname kernel: [? 192.707757] ath: Failed to stop TX DMA, queues=0x001!
Jun 16 18:10:12 hostname kernel: [? 192.736734] ath: DMA failed to stop in 10 ms AR_CR=0x00000024 AR_DIAG_SW=0x42000020 DMADBG_7=0x00004040
Jun 16 18:10:12 hostname kernel: [? 192.756744] ath: Could not stop RX, we could be confusing the DMA engine when we start RX up
Jun 16 18:10:12 hostname kernel: [? 192.791133] ath: DMA failed to stop in 10 ms AR_CR=0x00000024 AR_DIAG_SW=0x42000020 DMADBG_7=0x00008040
Jun 16 18:10:12 hostname kernel: [? 192.807675] ath: Could not stop RX, we could be confusing the DMA engine when we start RX up
I have compiled and tried latest stable driver version:
backports-3.10-rc1-2.tar.bz2
and snapshot:
backports-20130607.tar.bz2
with same results.
Final details on kernel driver versions used:
VERSION 2.6.32-48
2.6.32-5-686 #1 SMP Fri May 10 08:33:48 UTC 2013 i686
ath9k???????????????? 238533? 0
ath???????????????????? 6026? 1 ath9k
led_class?????????????? 1757? 1 ath9k
mac80211????????????? 123754? 1 ath9k
cfg80211?????????????? 87809? 3 mac80211,ath,ath9k
modinfo ath9k
filename:?????? /lib/modules/2.6.32-5-686/kernel/drivers/net/wireless/ath/ath9k/ath9k.ko
license:??????? Dual BSD/GPL
description:??? Support for Atheros 802.11n wireless LAN cards.
author:???????? Atheros Communications
alias:????????? pci:v0000168Cd0000002Esv*sd*bc*sc*i*
alias:????????? pci:v0000168Cd0000002Dsv*sd*bc*sc*i*
alias:????????? pci:v0000168Cd0000002Csv*sd*bc*sc*i*
alias:????????? pci:v0000168Cd0000002Bsv*sd*bc*sc*i*
alias:????????? pci:v0000168Cd0000002Asv*sd*bc*sc*i*
alias:????????? pci:v0000168Cd00000029sv*sd*bc*sc*i*
alias:????????? pci:v0000168Cd00000027sv*sd*bc*sc*i*
alias:????????? pci:v0000168Cd00000024sv*sd*bc*sc*i*
alias:????????? pci:v0000168Cd00000023sv*sd*bc*sc*i*
depends:??????? mac80211,led-class,ath,cfg80211
vermagic:?????? 2.6.32-5-686 SMP mod_unload modversions 686
parm:?????????? nohwcrypt:Disable hardware encryption (int)
VERSION 3.2.46-1
3.2.0-4-686-pae #1 SMP Debian 3.2.46-1 i686
ath9k????????????????? 67806? 0
ath9k_common?????????? 12648? 1 ath9k
ath9k_hw????????????? 311433? 2 ath9k_common,ath9k
ath??????????????????? 17114? 3 ath9k_hw,ath9k_common,ath9k
mac80211????????????? 171389? 1 ath9k
cfg80211????????????? 113445? 3 mac80211,ath,ath9k
modinfo ath9k
filename:?????? /lib/modules/3.2.0-4-686-pae/kernel/drivers/net/wireless/ath/ath9k/ath9k.ko
license:??????? Dual BSD/GPL
description:??? Support for Atheros 802.11n wireless LAN cards.
author:???????? Atheros Communications
alias:????????? pci:v0000168Cd00000037sv*sd*bc*sc*i*
alias:????????? pci:v0000168Cd00000034sv*sd*bc*sc*i*
alias:????????? pci:v0000168Cd00000033sv*sd*bc*sc*i*
alias:????????? pci:v0000168Cd00000032sv*sd*bc*sc*i*
alias:????????? pci:v0000168Cd00000030sv*sd*bc*sc*i*
alias:????????? pci:v0000168Cd0000002Esv*sd*bc*sc*i*
alias:????????? pci:v0000168Cd0000002Dsv*sd*bc*sc*i*
alias:????????? pci:v0000168Cd0000002Csv*sd*bc*sc*i*
alias:????????? pci:v0000168Cd0000002Bsv*sd*bc*sc*i*
alias:????????? pci:v0000168Cd0000002Asv*sd*bc*sc*i*
alias:????????? pci:v0000168Cd00000029sv*sd*bc*sc*i*
alias:????????? pci:v0000168Cd00000027sv*sd*bc*sc*i*
alias:????????? pci:v0000168Cd00000024sv*sd*bc*sc*i*
alias:????????? pci:v0000168Cd00000023sv*sd*bc*sc*i*
depends:??????? ath9k_hw,ath9k_common,mac80211,ath,cfg80211
intree:???????? Y
vermagic:?????? 3.2.0-4-686-pae SMP mod_unload modversions 686
parm:?????????? debug:Debugging mask (uint)
parm:?????????? nohwcrypt:Disable hardware encryption (int)
parm:?????????? blink:Enable LED blink on activity (int)
parm:?????????? btcoex_enable:Enable wifi-BT coexistence (int)
Support/help to get this issue fixed will be much appreciated.
Thank you.
Regards,
Jorge.