14645 – Got a warning when ath9k running as AP

Bug 14645 - Got a warning when ath9k running as AP

Summary: Got a warning when ath9k running as AP

Status:	CLOSED CODE_FIX

Alias:	None

Product:	Drivers
Classification:	Unclassified
Component:	network-wireless (show other bugs)
Hardware:	All Linux

Importance:	P1 normal
Assignee:	Atheros developers

URL:
Keywords:

Depends on:
Blocks:

Reported:	2009-11-20 14:06 UTC by frederic
Modified:	2012-06-18 12:40 UTC (History)
CC List:	5 users (show)

See Also:
Kernel Version:	2.6.30-bpo.1-686-bigmem
Subsystem:
Regression:	No
Bisected commit-id:

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Description frederic 2009-11-20 14:06:38 UTC

My PCI WiFi card is installed as AP, lspci shows:
Network controller: Atheros Communications Inc. Device 0029 (rev 01)
	Subsystem: Atheros Communications Inc. Device 2093
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 168, Cache Line Size: 64 bytes
	Interrupt: pin A routed to IRQ 16
	Region 0: Memory at fddf0000 (32-bit, non-prefetchable) [size=64K]
	Capabilities: [44] Power Management version 2
		Flags: PMEClk- DSI- D1- D2- AuxCurrent=100mA PME(D0+,D1-,D2-,D3hot+,D3cold-)
		Status: D0 PME-Enable- DSel=0 DScale=0 PME-
	Kernel driver in use: ath9k
	Kernel modules: ath9k

I'm using hostapd to set up the AP.

I'm using version 2.6.32-rc7 stable as ath9k driver.

In dmesg (debug of ath9k) this is printed:
[151191.797087] ------------[ cut here ]------------
[151191.797110] WARNING: at /work/wifi/compat-wireless-2.6.32-rc7/net/mac80211/rx.c:2486 ieee80211_rx+0xdf/0x579 [mac80211]()
[151191.797113] Hardware name: Crestline
[151191.797114] Modules linked in: ath9k mac80211 ath cfg80211 rfkill_backport rfcomm l2cap loop arc4 ecb evdev led_class serio_raw snd_pcsp i2c_i801 i2c_core iTCO_wdt snd_hda_codec_realtek btusb asix usbnet mii bluetooth rt73 processor button snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_timer snd soundcore snd_page_alloc intel_agp agpgart ext3 jbd mbcache ide_gd_mod ata_generic ata_piix libata scsi_mod piix ide_pci_generic ide_core ehci_hcd uhci_hcd usbcore thermal fan thermal_sys [last unloaded: rfkill_backport]
[151191.797162] Pid: 1082, comm: ffmpeg-0.5 Tainted: G        W  2.6.30-bpo.1-686-bigmem #1
[151191.797165] Call Trace:
[151191.797171]  [<c012c79c>] ? warn_slowpath_common+0x5e/0x8a
[151191.797175]  [<c012c7d2>] ? warn_slowpath_null+0xa/0xc
[151191.797188]  [<f8aa4382>] ? ieee80211_rx+0xdf/0x579 [mac80211]
[151191.797203]  [<f8bba362>] ? ath_rx_tasklet+0x813/0x85e [ath9k]
[151191.797207]  [<c0161a77>] ? handle_fasteoi_irq+0x90/0x97
[151191.797211]  [<c0108080>] ? xen_do_upcall+0x0/0xc
[151191.797214]  [<c0130a5a>] ? irq_exit+0x31/0x53
[151191.797217]  [<c0109002>] ? do_IRQ+0x65/0x76
[151191.797227]  [<f82bec0f>] ? ehci_watchdog+0x0/0x37 [ehci_hcd]
[151191.797230]  [<c0107c49>] ? common_interrupt+0x29/0x30
[151191.797242]  [<f8bb87f1>] ? ath9k_tasklet+0x44/0xbf [ath9k]
[151191.797245]  [<c013038f>] ? tasklet_action+0x63/0xa8
[151191.797249]  [<c0130897>] ? __do_softirq+0x8e/0x135
[151191.797252]  [<c013096c>] ? do_softirq+0x2e/0x38
[151191.797255]  [<c0130a4f>] ? irq_exit+0x26/0x53
[151191.797257]  [<c0109002>] ? do_IRQ+0x65/0x76
[151191.797260]  [<c0107c49>] ? common_interrupt+0x29/0x30
[151191.797263] ---[ end trace 54b419758ff7dbbb ]---
[151418.421793] ath9k: DMA failed to stop in 10 ms AR_CR=0x00000024 AR_DIAG_SW=0x40000020
[157047.064720] ------------[ cut here ]------------
[157047.064752] WARNING: at /work/wifi/compat-wireless-2.6.32-rc7/net/mac80211/rx.c:2486 ieee80211_rx+0xdf/0x579 [mac80211]()
[157047.064757] Hardware name: Crestline
[157047.064760] Modules linked in: ath9k mac80211 ath cfg80211 rfkill_backport rfcomm l2cap loop arc4 ecb evdev led_class serio_raw snd_pcsp i2c_i801 i2c_core iTCO_wdt snd_hda_codec_realtek btusb asix usbnet mii bluetooth rt73 processor button snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_timer snd soundcore snd_page_alloc intel_agp agpgart ext3 jbd mbcache ide_gd_mod ata_generic ata_piix libata scsi_mod piix ide_pci_generic ide_core ehci_hcd uhci_hcd usbcore thermal fan thermal_sys [last unloaded: rfkill_backport]
[157047.064833] Pid: 0, comm: swapper Tainted: G        W  2.6.30-bpo.1-686-bigmem #1
[157047.064835] Call Trace:
[157047.064842]  [<c012c79c>] ? warn_slowpath_common+0x5e/0x8a
[157047.064845]  [<c012c7d2>] ? warn_slowpath_null+0xa/0xc
[157047.064859]  [<f8aa4382>] ? ieee80211_rx+0xdf/0x579 [mac80211]
[157047.064872]  [<f8bb9ace>] ? ath_rx_send_to_mac80211+0x94/0xa2 [ath9k]
[157047.064884]  [<f8bba362>] ? ath_rx_tasklet+0x813/0x85e [ath9k]
[157047.064889]  [<c01461f4>] ? tick_dev_program_event+0x1e/0x81
[157047.064901]  [<f8bb87f1>] ? ath9k_tasklet+0x44/0xbf [ath9k]
[157047.064904]  [<c013038f>] ? tasklet_action+0x63/0xa8
[157047.064907]  [<c0130897>] ? __do_softirq+0x8e/0x135
[157047.064910]  [<c013096c>] ? do_softirq+0x2e/0x38
[157047.064913]  [<c0130a4f>] ? irq_exit+0x26/0x53
[157047.064917]  [<c0109002>] ? do_IRQ+0x65/0x76
[157047.064920]  [<c0107c49>] ? common_interrupt+0x29/0x30
[157047.064923]  [<c010d1a9>] ? mwait_idle+0x67/0x83
[157047.064928]  [<c010691a>] ? cpu_idle+0x46/0x60
[157047.064933]  [<c045877e>] ? start_kernel+0x2c2/0x2c5
[157047.064935] ---[ end trace 54b419758ff7dbbc ]---
[159053.727654] ath9k: DMA failed to stop in 10 ms AR_CR=0x00000024 AR_DIAG_SW=0x40000020

But everything seems to be working after these warnings.

Comment 1 Dominik Geyer 2009-12-02 13:15:23 UTC

I'm having the same warnings occasionally. Using pretty the same setup: ath9k driver with device
00:14.0 Network controller: Atheros Communications Inc. Device 0029 (rev 01)
in AP-mode (hostap).

Dec  2 01:05:24 homeserver kernel: ------------[ cut here ]------------
Dec  2 01:05:24 homeserver kernel: WARNING: at net/mac80211/rx.c:2486 ieee80211_rx+0xdc/0x578()
Dec  2 01:05:24 homeserver kernel: Hardware name: CN400-8237
Dec  2 01:05:24 homeserver kernel: Modules linked in: padlock_aes via_rng vfat fat pppoe pppox ppp_generic slhc bridge stp llc w83627hf hwmon_vid w83697hf_wdt ath9k ath led_class i2c_viapro via_rhine
Dec  2 01:05:24 homeserver kernel: Pid: 0, comm: swapper Tainted: G        W  2.6.32-rc8-homeserver #1
Dec  2 01:05:24 homeserver kernel: Call Trace:
Dec  2 01:05:24 homeserver kernel: [<c101b393>] ? warn_slowpath_common+0x5e/0x8a
Dec  2 01:05:24 homeserver kernel: [<c101b3c9>] ? warn_slowpath_null+0xa/0xc
Dec  2 01:05:24 homeserver kernel: [<c126c418>] ? ieee80211_rx+0xdc/0x578
Dec  2 01:05:24 homeserver kernel: [<cf893ec0>] ? ath_rx_tasklet+0x741/0x788 [ath9k]
Dec  2 01:05:24 homeserver kernel: [<cf88ff06>] ? ath_beacon_setup+0xe2/0xea [ath9k]
Dec  2 01:05:24 homeserver kernel: [<c10220e0>] ? get_next_timer_interrupt+0x15d/0x1c9
Dec  2 01:05:24 homeserver kernel: [<cf892451>] ? ath9k_tasklet+0x38/0x9d [ath9k]
Dec  2 01:05:24 homeserver kernel: [<c101e74d>] ? tasklet_action+0x3f/0x65
Dec  2 01:05:24 homeserver kernel: [<c101eb13>] ? __do_softirq+0x5d/0xc4
Dec  2 01:05:24 homeserver kernel: [<c101eb9c>] ? do_softirq+0x22/0x26
Dec  2 01:05:24 homeserver kernel: [<c101ec54>] ? irq_exit+0x25/0x53
Dec  2 01:05:24 homeserver kernel: [<c1003d40>] ? do_IRQ+0x66/0x76
Dec  2 01:05:24 homeserver kernel: [<c1002da9>] ? common_interrupt+0x29/0x30
Dec  2 01:05:24 homeserver kernel: [<c1007238>] ? default_idle+0x25/0x38
Dec  2 01:05:24 homeserver kernel: [<c1001b53>] ? cpu_idle+0x23/0x3c
Dec  2 01:05:24 homeserver kernel: [<c13e465d>] ? start_kernel+0x24e/0x251
Dec  2 01:05:24 homeserver kernel: ---[ end trace b4e9e9f197d615e5 ]---

Let me know whether more information is needed or what kind of debugging is recommended.

Comment 2 Wagner Sartori Junior 2010-04-26 20:15:31 UTC

This bug is also affecting some ubuntu users as show in https://bugs.launchpad.net/linux/+bug/548813

I'm using 2.6.32-21-386 right now and having this exactly same problem.

Comment 3 Wagner Sartori Junior 2010-04-28 17:47:16 UTC

I downloaded the latest compat-wireless source, built the modules and the problem goes away.

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