Even with current wireless-testing the same problems remain, they just occur less frequently now.

Sep 30 22:39:52 violino kernel: [327694.163945] wlan0: authenticate with AP 00:12:17:26:56:10
Sep 30 22:39:53 violino kernel: [327694.360741] wlan0: authenticate with AP 00:12:17:26:56:10
Sep 30 22:39:53 violino kernel: [327694.362835] wlan0: authenticated
Sep 30 22:39:53 violino kernel: [327694.362856] wlan0: associate with AP 00:12:17:26:56:10
Sep 30 22:39:53 violino kernel: [327694.367017] wlan0: RX ReassocResp from 00:12:17:26:56:10 (capab=0x431 status=0 aid=2)
Sep 30 22:39:53 violino kernel: [327694.367040] wlan0: associated
Sep 30 23:09:06 violino kernel: [329447.700548] wlan0: no probe response from AP 00:12:17:26:56:10 - disassociating
Sep 30 23:09:12 violino kernel: [329453.390434] wlan0: authenticate with AP 00:12:17:26:56:10
Sep 30 23:09:12 violino kernel: [329453.587227] wlan0: authenticate with AP 00:12:17:26:56:10
Sep 30 23:09:12 violino kernel: [329453.596536] wlan0: authenticated
Sep 30 23:09:12 violino kernel: [329453.596557] wlan0: associate with AP 00:12:17:26:56:10
Sep 30 23:09:12 violino kernel: [329453.626150] wlan0: RX ReassocResp from 00:12:17:26:56:10 (capab=0x431 status=0 aid=2)
Sep 30 23:09:12 violino kernel: [329453.626175] wlan0: associated
Sep 30 23:15:11 violino kernel: [329813.143845] wlan0: no probe response from AP 00:12:17:26:56:10 - disassociating
Sep 30 23:15:17 violino kernel: [329818.803730] wlan0: authenticate with AP 00:12:17:26:56:10
Sep 30 23:15:17 violino kernel: [329818.806118] wlan0: authenticated
Sep 30 23:15:17 violino kernel: [329818.806145] wlan0: associate with AP 00:12:17:26:56:10
Sep 30 23:15:17 violino kernel: [329818.810114] wlan0: RX ReassocResp from 00:12:17:26:56:10 (capab=0x431 status=0 aid=2)
Sep 30 23:15:17 violino kernel: [329818.810250] wlan0: associated
Oct  1 02:17:26 violino kernel: [340747.876038] wlan0: no probe response from AP 00:12:17:26:56:10 - disassociating
Oct  1 02:17:32 violino kernel: [340753.543467] ath9k: DMA failed to stop in 10 ms AR_CR=0x00000024 AR_DIAG_SW=0x40000020
Oct  1 02:17:32 violino kernel: [340753.552914] wlan0: authenticate with AP 00:12:17:26:56:10
Oct  1 02:17:32 violino kernel: [340753.553687] wlan0: authenticated
Oct  1 02:17:32 violino kernel: [340753.553712] wlan0: associate with AP 00:12:17:26:56:10
Oct  1 02:17:32 violino kernel: [340753.556806] wlan0: RX ReassocResp from 00:12:17:26:56:10 (capab=0x431 status=0 aid=2)
Oct  1 02:17:32 violino kernel: [340753.556806] wlan0: associated
Oct  1 02:53:36 violino kernel: [342917.805911] wlan0: no probe response from AP 00:12:17:26:56:10 - disassociating
Oct  1 02:53:42 violino kernel: [342923.475754] wlan0: authenticate with AP 00:12:17:26:56:10
Oct  1 02:53:42 violino kernel: [342923.476639] wlan0: authenticated
Oct  1 02:53:42 violino kernel: [342923.476639] wlan0: associate with AP 00:12:17:26:56:10
Oct  1 02:53:42 violino kernel: [342923.479881] wlan0: RX ReassocResp from 00:12:17:26:56:10 (capab=0x431 status=0 aid=2)
Oct  1 02:53:42 violino kernel: [342923.479881] wlan0: associated
Oct  1 03:00:21 violino kernel: [343322.409166] wlan0: no probe response from AP 00:12:17:26:56:10 - disassociating
Oct  1 03:00:26 violino kernel: [343328.065713] wlan0: authenticate with AP 00:12:17:26:56:10
Oct  1 03:00:26 violino kernel: [343328.067280] wlan0: authenticated
Oct  1 03:00:26 violino kernel: [343328.067288] wlan0: associate with AP 00:12:17:26:56:10
Oct  1 03:00:26 violino kernel: [343328.069856] wlan0: RX ReassocResp from 00:12:17:26:56:10 (capab=0x431 status=0 aid=2)
Oct  1 03:00:26 violino kernel: [343328.069864] wlan0: associated
Oct  1 05:31:16 violino kernel: [352377.844929] wlan0: no probe response from AP 00:12:17:26:56:10 - disassociating
Oct  1 05:31:22 violino kernel: [352383.502306] wlan0: authenticate with AP 00:12:17:26:56:10
Oct  1 05:31:22 violino kernel: [352383.504054] wlan0: authenticated
Oct  1 05:31:22 violino kernel: [352383.504054] wlan0: associate with AP 00:12:17:26:56:10
Oct  1 05:31:22 violino kernel: [352383.505970] wlan0: RX ReassocResp from 00:12:17:26:56:10 (capab=0x431 status=0 aid=2)
Oct  1 05:31:22 violino kernel: [352383.506007] wlan0: associated
Oct  1 05:38:01 violino kernel: [352782.821565] wlan0: no probe response from AP 00:12:17:26:56:10 - disassociating
Oct  1 05:38:07 violino kernel: [352788.478100] wlan0: authenticate with AP 00:12:17:26:56:10
Oct  1 05:38:07 violino kernel: [352788.479807] wlan0: authenticated
Oct  1 05:38:07 violino kernel: [352788.479812] wlan0: associate with AP 00:12:17:26:56:10
Oct  1 05:38:07 violino kernel: [352788.482395] wlan0: RX ReassocResp from 00:12:17:26:56:10 (capab=0x431 status=0 aid=2)
Oct  1 05:38:07 violino kernel: [352788.482408] wlan0: associated
Oct  1 08:08:51 violino kernel: [361832.767330] wlan0: no probe response from AP 00:12:17:26:56:10 - disassociating
Oct  1 08:08:57 violino kernel: [361838.438028] wlan0: authenticate with AP 00:12:17:26:56:10
Oct  1 08:08:57 violino kernel: [361838.439655] wlan0: authenticated
Oct  1 08:08:57 violino kernel: [361838.439655] wlan0: associate with AP 00:12:17:26:56:10
Oct  1 08:08:57 violino kernel: [361838.441569] wlan0: RX ReassocResp from 00:12:17:26:56:10 (capab=0x431 status=0 aid=2)
Oct  1 08:08:57 violino kernel: [361838.441607] wlan0: associated
Oct  1 11:00:01 violino kernel: [372102.939614] wlan0: no probe response from AP 00:12:17:26:56:10 - disassociating
Oct  1 11:00:07 violino kernel: [372108.616994] wlan0: authenticate with AP 00:12:17:26:56:10
Oct  1 11:00:07 violino kernel: [372108.619125] wlan0: authenticated
Oct  1 11:00:07 violino kernel: [372108.619125] wlan0: associate with AP 00:12:17:26:56:10
Oct  1 11:00:07 violino kernel: [372108.620495] wlan0: RX ReassocResp from 00:12:17:26:56:10 (capab=0x431 status=0 aid=2)
Oct  1 11:00:07 violino kernel: [372108.620495] wlan0: associated
Oct  1 11:03:47 violino kernel: [372328.819580] wlan0: no probe response from AP 00:12:17:26:56:10 - disassociating
Oct  1 11:03:53 violino kernel: [372334.473644] wlan0: authenticate with AP 00:12:17:26:56:10
Oct  1 11:03:53 violino kernel: [372334.475990] wlan0: authenticated
Oct  1 11:03:53 violino kernel: [372334.475990] wlan0: associate with AP 00:12:17:26:56:10
Oct  1 11:03:53 violino kernel: [372334.478844] wlan0: RX ReassocResp from 00:12:17:26:56:10 (capab=0x431 status=0 aid=2)
Oct  1 11:03:53 violino kernel: [372334.478844] wlan0: associated
Oct  1 11:13:31 violino kernel: [372912.819564] wlan0: no probe response from AP 00:12:17:26:56:10 - disassociating
Oct  1 11:13:37 violino kernel: [372918.493586] wlan0: authenticate with AP 00:12:17:26:56:10
Oct  1 11:13:37 violino kernel: [372918.494621] wlan0: authenticated
Oct  1 11:13:37 violino kernel: [372918.494621] wlan0: associate with AP 00:12:17:26:56:10
Oct  1 11:13:37 violino kernel: [372918.496999] wlan0: RX ReassocResp from 00:12:17:26:56:10 (capab=0x431 status=0 aid=2)
Oct  1 11:13:37 violino kernel: [372918.497030] wlan0: associated

The "DMA failed to stop" issue has been discussed at length with no resolution

I first reported it here

http://thread.gmane.org/gmane.linux.kernel.wireless.general/38721/focus=38920
(notice the 0xdeadbeef in the kernel log - obviously a driver bug)

it got discussed further here

https://lists.ath9k.org/pipermail/ath9k-devel/2009-August/002228.html

After that thread, further mention of the problem is just ignored

https://lists.ath9k.org/pipermail/ath9k-devel/2009-August/002265.html
https://lists.ath9k.org/pipermail/ath9k-devel/2009-August/002278.html
https://lists.ath9k.org/pipermail/ath9k-devel/2009-September/002356.html
https://lists.ath9k.org/pipermail/ath9k-devel/2009-September/002405.html
https://lists.ath9k.org/pipermail/ath9k-devel/2009-September/002419.html
https://lists.ath9k.org/pipermail/ath9k-devel/2009-September/002422.html
https://lists.ath9k.org/pipermail/ath9k-devel/2009-September/002455.html

I guess if they ignore it enough the problem will go away.