From: Bjørn Mork <bjorn@xxxxxxx>
Date: Wed, 13 Feb 2013 23:09:52 +0100
> commit bd329e1 ("net: cdc_ncm: do not bind to NCM compatible MBIM devices")
> added a test for a CDC MBIM altsetting, implementing the cdc_ncm part of
> MBIM backward compatibility support. This intentionally made the driver
> behave differently for CDC NCM devices with 2 alternate settings for the
> Communication interface, depending on whether or not CONFIG_USB_NET_CDC_MBIM
> was enabled. This is correct iff alternate setting #1 really *is* a MBIM
> setting. If not, then NCM probing will use a different altsetting than before,
> possibly causing probing failures depending on CONFIG_USB_NET_CDC_MBIM.
>
> Fix by setting the altsetting back to default after the test, restoring the
> previous behaviour for non MBIM devices.
>
> This bug causes probing of Huawei E3276 devices to fail when the MBIM driver
> is enabled, because these devices have a second alternate setting with no CDC
> functional descriptors.
>
> Cc: Greg Suarez <gsuarez@xxxxxxxxxxxxxx>
> Cc: Alexey Orishko <alexey.orishko@xxxxxxxxxxxxxx>
> Reported-and-tested-by: Jonathan A. <yo.natan@xxxxxxxxxxx>
> Signed-off-by: Bjørn Mork <bjorn@xxxxxxx>
Applied.
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