netdev - ath5k regression associating with APs in 2.6.38

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Message-ID: <20110504153819.GA4551@thinkpad-t410>
Date:	Wed, 4 May 2011 10:38:19 -0500
From:	Seth Forshee <seth.forshee@...onical.com>
To:	Jiri Slaby <jirislaby@...il.com>,
	Nick Kossifidis <mickflemm@...il.com>,
	"Luis R. Rodriguez" <lrodriguez@...eros.com>,
	Bob Copeland <me@...copeland.com>
Cc:	"John W. Linville" <linville@...driver.com>,
	linux-wireless@...r.kernel.org, ath5k-devel@...ts.ath5k.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: ath5k regression associating with APs in 2.6.38

I've been investigating some reports of a regression in associating with
APs with AR2413 in 2.6.38. Association repeatedly fails with some
"direct probe to x timed out" messages (see syslog excerpt below),
although it will generally associate eventually, after many tries.

Bisection identifies 8aec7af (ath5k: Support synth-only channel change
for AR2413/AR5413) as offending commit. Prior to this commit there are
no direct probe messages at all in the logs. I've also found that
forcing fast to false at the top of ath5k_hw_reset() fixes the issue.
I'm not sure what the connection is between this commit and the
timeouts. Any suggestions?

Thanks,
Seth

May  4 09:32:15 AcerAspire5100 wpa_supplicant[757]: Trying to associate with c0:3f:0e:b9:f3:b2 (SSID='aureola' freq=2452 MHz)
May  4 09:32:15 AcerAspire5100 kernel: [  120.063271] wlan0: direct probe to c0:3f:0e:b9:f3:b2 (try 1/3)
May  4 09:32:16 AcerAspire5100 kernel: [  120.260074] wlan0: direct probe to c0:3f:0e:b9:f3:b2 (try 2/3)
May  4 09:32:16 AcerAspire5100 kernel: [  120.460084] wlan0: direct probe to c0:3f:0e:b9:f3:b2 (try 3/3)
May  4 09:32:16 AcerAspire5100 kernel: [  120.660082] wlan0: direct probe to c0:3f:0e:b9:f3:b2 timed out
May  4 09:32:25 AcerAspire5100 wpa_supplicant[757]: Authentication with c0:3f:0e:b9:f3:b2 timed out.

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