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

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Date:	Mon, 2 Jun 2014 17:40:36 +0200
From:	Johan Hovold <jhovold@...il.com>
To:	Mike Remski <mremski@...ualink.net>
Cc:	Johan Hovold <jhovold@...il.com>, linux-kernel@...r.kernel.org,
	linux-usb@...r.kernel.org
Subject: Re: ftdi_sio BUG: NULL pointer dereference

[ 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
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