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List:       linux-usb
Subject:    Re: USB-Serial : disconnecting Edgeport now cause an OOPS
From:       XI <xizard () free ! fr>
Date:       2010-11-08 18:04:46
Message-ID: 4CD83BBE.2090202 () free ! fr
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Greg KH wrote:
> On Tue, Oct 26, 2010 at 05:53:14PM +0200, XI wrote:
>> Hi, there seems to be a regression in latest kernels regarding Edgeport
>> USB <-> serial devices.
>>
>>
>>
>> *** Problem description:
>>
>> I use USB <-> Serial converters from Inside Out Networks (model
>> Edgeport 4S & Edgeport 8S, kernel driver io_ti)
>>
>> Since kernel 2.6.33, disconnecting the USB plug of the device _while
>> a transfer is in progress_ cause severe problem to the Linux kernel:
>>  -> Kernel OOPS in 2.6.33.x to 2.6.34.x series (No USB device is
>> working after this Oops)
>>  -> Computer hang in 2.6.36 (there is no Oops anymore but the
>> problem is even worst because the computer is stuck until I
>> reconnect the device / and sometimes forever)
>>  -> Note: 2.6.35.x also fail but I don't remember if they produce an
>> Oops. Also note that 2.6.32.24 and previous works just fine.
> 
> Hm, can you run 'git bisect' between 2.6.32 and 2.6.33 to try to find
> the problem patch that caused this issue?
> 
> thanks,
> 
> greg k-h
> 
> 

Hi,

I have run git bisect between 2.6.32 and v2.6.33. Git result is below :
"
git bisect bad
e1108a63e10d344284011cccc06328b2cd3e5da3 is the first bad commit
commit e1108a63e10d344284011cccc06328b2cd3e5da3
Author: Alan Cox <alan@linux.intel.com>
Date:   Tue Oct 6 16:06:36 2009 +0100

     usb_serial: Use the shutdown() operation

     As Alan Stern pointed out - now we have tty_port_open the shutdown 
method and locking allow us to whack the other bits into the full helper 
methods and provide a shutdown op which the tty port code will 
synchronize with setup for us.

     Signed-off-by: Alan Cox <alan@linux.intel.com>
     Cc: Alan Stern <stern@rowland.harvard.edu>
     Cc: Oliver Neukum <oliver@neukum.org>
     Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

:040000 040000 415f5c46a1bb71a4fe6f7d76ab3149e955ef0ed6 
561d8a0423a9f996eebffed326eeb2ced14ef046 M      drivers
"

It seems related to my problem since the OOPS occurs when I disconnect 
the Edgeport USB<->Serial device.

What do you think ?


Regards,
Xavier


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