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WARNING with ath9k_htc on TL-WN721N

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Hello list, 

I ma connected to my WPA2-PSK protected network and from time to time I get the
following warning in dmesg. I don't experience any malfunctionng but I thought
it was worth reporting. My kernel version is linux-3.10.10. I remember I've seen
this warning also with previous versions.

The device I use is a TP-LINK TL-WN721N.
lsusb says:

Bus 002 Device 003: ID 0cf3:9271 Atheros Communications, Inc. AR9271 802.11n

Cheers,

[ 7762.963117] ------------[ cut here ]------------
[ 7762.963127] WARNING: at drivers/net/wireless/ath/ath9k/htc_drv_txrx.c:501
ath9k_htc_tx_process+0x36b/0x380 [ath9k_htc]()
[ 7762.963129] Modules linked in: usbhid btusb bluetooth ftdi_sio usbserial
ath9k_htc ath9k_common ath9k_hw ath acpi_cpufreq mperf kvm_intel kvm
crc32c_intel iwldvm mac80211 ghash_clmulni_intel snd_hda_codec_hdmi
snd_hda_codec_idt aesni_intel ehci_pci iwlwifi snd_hda_intel snd_hda_codec
ehci_hcd snd_hwdep cfg80211 aes_x86_64 snd_pcm snd_page_alloc snd_timer usbcore
snd lrw gf128mul lpc_ich glue_helper usb_common ablk_helper psmouse soundcore
cryptd
[ 7762.963159] CPU: 0 PID: 512 Comm: X Tainted: G        W    3.10.10-gentoo #2
[ 7762.963161] Hardware name: Dell Inc. Latitude E5420/0675PR, BIOS A01
04/20/2011
[ 7762.963163]  ffffffff814bf8ea ffffffff81034886 ffff8802249a9cf0
ffff880221bf17a0
[ 7762.963166]  ffff880221bf1d50 0000000000000000 0000000000004188
ffffffffa05a316b
[ 7762.963169]  ffffffffa05a2d9c 0000000000000000 ffff88022489860d
ffff880221bf17a0
[ 7762.963172] Call Trace:
[ 7762.963174]  <IRQ>  [<ffffffff814bf8ea>] ? dump_stack+0xc/0x15
[ 7762.963183]  [<ffffffff81034886>] ? warn_slowpath_common+0x56/0x70
[ 7762.963187]  [<ffffffffa05a316b>] ? ath9k_htc_tx_process+0x36b/0x380
[ath9k_htc]
[ 7762.963191]  [<ffffffffa05a2d9c>] ? ath9k_htc_tx_get_packet+0x12c/0x190
[ath9k_htc]
[ 7762.963195]  [<ffffffffa05a3a7e>] ? ath9k_htc_txstatus+0x2e/0x120 [ath9k_htc]
[ 7762.963198]  [<ffffffffa05a274e>] ? ath9k_wmi_event_tasklet+0x12e/0x150
[ath9k_htc]
[ 7762.963202]  [<ffffffff8103b44a>] ? tasklet_action+0x5a/0xc0
[ 7762.963205]  [<ffffffff8103b9b6>] ? __do_softirq+0xd6/0x1b0
[ 7762.963209]  [<ffffffff8103bbfd>] ? irq_exit+0xbd/0xd0
[ 7762.963212]  [<ffffffff81004819>] ? do_IRQ+0x49/0xb0
[ 7762.963215]  [<ffffffff814c51aa>] ? common_interrupt+0x6a/0x6a
[ 7762.963216]  <EOI>  [<ffffffff81080f62>] ? smp_call_function_many+0x222/0x280
[ 7762.963224]  [<ffffffff812dc7c0>] ? i915_restore_state+0x960/0x960
[ 7762.963226]  [<ffffffff812dc7c0>] ? i915_restore_state+0x960/0x960
[ 7762.963229]  [<ffffffff81080fe9>] ? smp_call_function+0x29/0x60
[ 7762.963232]  [<ffffffff81081041>] ? on_each_cpu+0x21/0x70
[ 7762.963235]  [<ffffffff812dcd23>] ? i915_gem_object_update_fence+0xf3/0x100
[ 7762.963238]  [<ffffffff812df18d>] ? i915_gem_object_get_fence+0x6d/0x1f0
[ 7762.963241]  [<ffffffff812e12f0>] ? i915_gem_fault+0x1c0/0x210
[ 7762.963244]  [<ffffffff810d6516>] ? __do_fault+0x66/0x4f0
[ 7762.963248]  [<ffffffff812b57a5>] ? drm_gem_object_lookup+0x55/0xa0
[ 7762.963251]  [<ffffffff810d92b7>] ? handle_pte_fault+0x87/0x850
[ 7762.963254]  [<ffffffff8102a38d>] ? __do_page_fault+0x11d/0x440
[ 7762.963257]  [<ffffffff810e0678>] ? do_mmap_pgoff+0x2f8/0x3b0
[ 7762.963261]  [<ffffffff8106ac71>] ? cpuacct_account_field+0x11/0x60
[ 7762.963264]  [<ffffffff8102a6f2>] ? do_page_fault+0x22/0x40
[ 7762.963267]  [<ffffffff814c53e2>] ? page_fault+0x22/0x30
[ 7762.963269] ---[ end trace 3c536c5012f2e043 ]---


-- 
Antonio Quartulli

..each of us alone is worth nothing..
Ernesto "Che" Guevara

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