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Date: Mon, 3 Aug 2009 15:22:34 +0200
Message-ID: <81b0412b0908030622r7abce823l2b382a5f3b75f50b@mail.gmail.com>
Subject: Re: Oops in CDC ACM after an Openmoko phone (neo1973) changes its usb 
	interface from ACM to Ethernet
From: Alex Riesen <raa.lkml@gmail.com>
To: Oliver Neukum <oliver@neukum.org>
Cc: Alan Stern <stern@rowland.harvard.edu>, linux-usb@vger.kernel.org,
       Oliver Neukum <oliver@neukum.name>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       Greg Kroah-Hartman <greg@kroah.com>,
       Alan Cox <alan@lxorguk.ukuu.org.uk>
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On Mon, Aug 3, 2009 at 15:04, Oliver Neukum<oliver@neukum.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?