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List:       linux-usb
Subject:    Re: USB-Serial : disconnecting Edgeport now cause an OOPS
From:       Greg KH <greg () kroah ! com>
Date:       2010-10-28 18:21:20
Message-ID: 20101028182120.GG2573 () kroah ! com
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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
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