#11136 HIGH 1.75-so: XO-1.75 os36 USB device removal may cause hangs and stops USB working

[Zarro Boogs per Child]

#11136: XO-1.75 os36 USB device removal may cause hangs and stops USB working
--------------------------------+-------------------------------------------
           Reporter:  Quozl     |       Owner:  saadia                           
               Type:  defect    |      Status:  assigned                         
           Priority:  high      |   Milestone:  1.75-software                    
          Component:  kernel    |     Version:  Development build as of this date
         Resolution:            |    Keywords:                                   
        Next_action:  diagnose  |    Verified:  0                                
Deployment_affected:            |   Blockedby:                                   
           Blocking:  10914     |  
--------------------------------+-------------------------------------------

Comment(by greenfeld):

 Tried to reproduce this with various external USB devices.

 Messages like "pxau2o-ehci pxau2o-ehci.0: detected XactErr len 0/8 retry
 #" can be generally caused with some USB devices by slowly wiggling their
 connectors back & forth and slowly removing said connector from the
 XO-1.75.

 The "usb 1-1.2: usb_disable_device nuking all URBs" message and disabling
 of all USB ports could only be reached by inserting & removing a USB 1.1
 lowspeed device.  Otherwise removing all USB devices just puts the USB hub
 to sleep.  If we are not already in this state, high-speed USB 2.0 devices
 can be inserted & removed repeatedly without any issue.

 Need to do some further analysis.

-- 
Ticket URL: <http://dev.laptop.org/ticket/11136#comment:12>
One Laptop Per Child <http://laptop.org/>
OLPC bug tracking system