#11381 NORM 1.75-so: Kernel hang with frequent wlan scan requests

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#11381: Kernel hang with frequent wlan scan requests
-----------------------------+----------------------------------------------
 Reporter:  martin.langhoff  |                 Owner:  dilinger     
     Type:  defect           |                Status:  new          
 Priority:  normal           |             Milestone:  1.75-software
Component:  kernel           |               Version:  not specified
 Keywords:                   |           Next_action:  never set    
 Verified:  0                |   Deployment_affected:               
Blockedby:                   |              Blocking:               
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 runin-wlan triggers repeated scan requests. Under the runin workload, we
 found that os882 and os883 (11.3.0) hang with a trace in the Libertas
 driver.

 When the hang occurs, Libertas stacktraces are visible over the serial
 port.

 Andres prepared a series of patches to fix and diagnose the problem. The
 patches are available at http://dev.laptop.org/git/olpc-kernel/commit/?h
 =bringup-ml-wlan

 Those patches were rolled into os24, available at
 http://dev.laptop.org/~martin/xo1.75c1os/ .

 With OS24, runin completed successfully. No warnings were ever printed so
 we believe that the first patch of that patchseries fixed the problem. A
 version of that patch was committed into arm-3.0-wip as
 http://dev.laptop.org/git/olpc-
 kernel/commit/?h=arm-3.0-wip&id=97ffc4d09af9cb5536e6bcf4f81a31e5b38d556c

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Ticket URL: <http://dev.laptop.org/ticket/11381>
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