linux-kernel - Re: ftdi_sio BUG: NULL pointer dereference

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Date:	Mon, 02 Jun 2014 12:26:04 -0400
From:	Mike Remski <mremski@...ualink.net>
To:	Greg KH <greg@...ah.com>
CC:	Johan Hovold <jhovold@...il.com>, linux-kernel@...r.kernel.org,
	linux-usb@...r.kernel.org
Subject: Re: ftdi_sio BUG: NULL pointer dereference

On 06/02/2014 12:23 PM, Greg KH wrote:
> On Mon, Jun 02, 2014 at 12:09:36PM -0400, Mike Remski wrote:
>> On 06/02/2014 11:40 AM, Johan Hovold wrote:
>>> [ Please avoid top-posting. ]
>>>
>>> On Mon, Jun 02, 2014 at 11:16:11AM -0400, Mike Remski wrote:
>>>> Thanks Johan, that's why I looked at the cross references for ftdi_sio.c
>>>> over on
>>>> http://lxr.free-electrons.com/source/drivers/usb/serial/ftdi_sio.c,
>>>> latest version it's showing is 3.14.  It appears that the ftdi_sio code
>>>> is largely the same as in 2.6.32, particularly in the
>>>> ftdi_set_max_packet_size() function.
>>> Lots of things have changed since v2.6.32 and not just in the driver
>>> itself but in all the infrastructure it relies on.
>>>
>>>> I'm trying to verify if the "number of endpoints is 0" is a valid
>>>> situation.
>>> No, that is not normal, but it should not crash the driver if it's a
>>> hardware issue. What is the lsusb -v output of your device (make sure
>>> the ftdi_sio driver isn't loaded when connecting the device).
>>>
>>> And what happens if you plug it into a machine running a recent kernel?
>>>
>>> Thanks,
>>> Johan
>> Plugging device into a system running Redhat, kernel 3.3.4 crashes the
>> system.
> 3.3.4 is still _many_ years old.  Please try something from 2014 at the
> latest...

Understood Greg;  it was the best I had immediately available.  I am 
working on setting up/finding a later kernel at the moment.

thanks

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