linux-kernel - Re: Oops in CDC ACM after an Openmoko phone (neo1973) changes its usb interface from ACM to Ethernet

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Date:	Mon, 3 Aug 2009 15:22:34 +0200
From:	Alex Riesen <raa.lkml@...il.com>
To:	Oliver Neukum <oliver@...kum.org>
Cc:	Alan Stern <stern@...land.harvard.edu>, linux-usb@...r.kernel.org,
	Oliver Neukum <oliver@...kum.name>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Greg Kroah-Hartman <greg@...ah.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: Oops in CDC ACM after an Openmoko phone (neo1973) changes its usb 
	interface from ACM to Ethernet

On Mon, Aug 3, 2009 at 15:04, Oliver Neukum<oliver@...kum.org> wrote:
> Am Montag, 3. August 2009 11:17:05 schrieb Alex Riesen:
>> 466             ep = (usb_pipein(acm->rx_endpoint) ? acm->dev->ep_in :
>> acm->dev->ep_out)
>> 467                             [usb_pipeendpoint(acm->rx_endpoint)];
>> 468             if (usb_endpoint_xfer_int(&ep->desc))
>>
>> So it looks like ep is NULL (usb_endpoint_xfer_int accesses
>> desc.bmAttributes, which is 3 bytes off the beginning of struct
>> usb_host_endpoint (desc being the first field in usb_host_endpoint).
>
> This tells you that the device has been disconnected. The question
> is not why this function fails, but why it is called even though the
> device has been disconnected.

Cool. How can I help?
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