From: Bjørn Mork <bjorn@xxxxxxx>
Date: Thu, 14 Mar 2013 12:05:13 +0100
> commit bd329e1 ("net: cdc_ncm: do not bind to NCM compatible MBIM devices")
> introduced a new policy, preferring MBIM for dual NCM/MBIM functions if
> the cdc_mbim driver was enabled. This caused a regression for users
> wanting to use NCM.
>
> Devices implementing NCM backwards compatibility according to section
> 3.2 of the MBIM v1.0 specification allow either NCM or MBIM on a single
> USB function, using different altsettings. The cdc_ncm and cdc_mbim
> drivers will both probe such functions, and must agree on a common
> policy for selecting either MBIM or NCM. Until now, this policy has
> been set at build time based on CONFIG_USB_NET_CDC_MBIM.
>
> Use a module parameter to set the system policy at runtime, allowing the
> user to prefer NCM on systems with the cdc_mbim driver.
>
> Cc: Greg Suarez <gsuarez@xxxxxxxxxxxxxx>
> Cc: Alexey Orishko <alexey.orishko@xxxxxxxxxxxxxx>
> Reported-by: Geir Haatveit <nospam@xxxxxxxxxxx>
> Reported-by: Tommi Kyntola <kynde@xxxxxxxxx>
> Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=54791
> Signed-off-by: Bjørn Mork <bjorn@xxxxxxx>
Ok, this is fine as a solution for now, applied and queued up for -stable.
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