kern/156884: dev/ath instablity

>Number:         156884
>Category:       kern
>Synopsis:       dev/ath instablity
>Confidential:   no
>Severity:       serious
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sun May 08 14:10:06 UTC 2011
>Closed-Date:
>Last-Modified:
>Originator:     Dima Panov
>Release:        FreeBSD 9.0-900036-CURRENT amd64
>Organization:
Fluffy.Khv.RU 
>Environment:

System: FreeBSD 9.0-900036-CURRENT #0 r221369M: Wed May  4 09:56:07 VLAST 2011
    toor@Beastie.Fluffy.Khv.RU:/usr/obj/usr/src/sys/Spot

>Description:

With latest FreeBSD 9.0-900036-CURRENT #0 r221612M: Sun May 8 12:10:51 VLAST 2011  I've got too unstable wireless in my laptop with AR9285 card. 
After 1.5-2 hours of online work, it lost connection. Any attempts to restart wireless produce next lines on console until reboot:

May 8 15:24:21 Beastie kernel: [ath] Warning - initial NF calibration did not complete in time, noisy environment? 
May 8 15:24:46 Beastie kernel: ath0: device timeout

Reverted to kernel r221369M, which is more stable. 

>How-To-Repeat:

>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted:
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