tree 1ca9a13fe0f189a30d7e8b2dc04f01764ef8702f
parent 1666984c8625b3db19a9abc298931d35ab7bc64b
author Bjørn Mork <bjorn@mork.no> 1457040053 +0100
committer David S. Miller <davem@davemloft.net> 1457379459 -0500

cdc_ncm: toggle altsetting to force reset before setup

Some devices will silently fail setup unless they are reset first.
This is necessary even if the data interface is already in
altsetting 0, which it will be when the device is probed for the
first time.  Briefly toggling the altsetting forces a function
reset regardless of the initial state.

This fixes a setup problem observed on a number of Huawei devices,
appearing to operate in NTB-32 mode even if we explicitly set them
to NTB-16 mode.

Signed-off-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: David S. Miller <davem@davemloft.net>