netdev - Re: [PATCH net,stable] cdc_ncm: toggle altsetting to force reset before setup

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Date:	Mon, 07 Mar 2016 14:38:11 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	bjorn@...k.no
Cc:	oliver@...kum.org, netdev@...r.kernel.org,
	linux-usb@...r.kernel.org
Subject: Re: [PATCH net,stable] cdc_ncm: toggle altsetting to force reset
 before setup

From: Bjørn Mork <bjorn@...k.no>
Date: Thu,  3 Mar 2016 22:20:53 +0100

> 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@...k.no>

Applied and queued up for -stable, thanks.