netdev - Re: [PATCH] qmi_wwan/cdc_ether: add device IDs for Dell 5804 (Novatel E371) WWAN card

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Date:	Wed, 08 May 2013 14:25:50 -0500
From:	Dan Williams <dcbw@...hat.com>
To:	David Miller <davem@...emloft.net>
Cc:	dagofthedofg@...il.com, bjorn@...k.no, netdev@...r.kernel.org,
	stable@...r.kernel.org
Subject: Re: [PATCH] qmi_wwan/cdc_ether: add device IDs for Dell 5804
 (Novatel E371) WWAN card

On Wed, 2013-05-08 at 12:19 -0700, David Miller wrote:
> From: dag dg <dagofthedofg@...il.com>
> Date: Wed, 8 May 2013 14:11:48 -0500
> 
> > Just a side note on this. By default for this device, modprobe won't
> > load and assign the option driver. However, if cdc_ether is
> > blacklisted and you try to load option onto the device, it will try to
> > load the option driver onto where cdc_ether was being used, which will
> > cause the system to lock up. I'm not sure what needs to be done to
> > force qmi_wwan to take over cdc_ether without option grabbing these
> > IDs...

This is a consequence of "new_id" not being flexible enough to handle
class/subclass/protocol in addition to USB IDs.  Thus when you use it,
the driver binds to *all* USB interfaces, even ones that the driver
shouldn't ever control

So the issue you refer to is actually user error, helped by a
too-coarse-grained kernel API.  It's not an issue when things are all
done correctly, which is to say when the USB IDs and interface
class/subclass/protocol are properly added to the kernel drivers.

The option patch I posted earlier will fix this issue correctly.

Dan

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