netdev - Re: [PATCH net,stable] cdc_ncm: workaround for EM7455 "silent" data interface

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Date:	Mon, 04 Jul 2016 15:00:01 +0200
From:	Oliver Neukum <oneukum@...e.com>
To:	Bjørn Mork <bjorn@...k.no>
Cc:	linux-usb@...r.kernel.org, netdev@...r.kernel.org, metze@...ba.org
Subject: Re: [PATCH net,stable] cdc_ncm: workaround for EM7455 "silent" data
 interface

On Mon, 2016-07-04 at 13:40 +0200, Bjørn Mork wrote:
> Oliver Neukum <oneukum@...e.com> writes:
> > On Sun, 2016-07-03 at 22:24 +0200, Bjørn Mork wrote:
> >> Several Lenovo users have reported problems with their Sierra
> >> Wireless EM7455 modem. The driver has loaded successfully and
> >> the MBIM management channel has appeared to work, including
> >> establishing a connection to the mobile network. But no frames
> >> have been received over the data interface.
> >
> > If this is needed in open() it must also be needed in reset_resume()
> 
> reset_resume needs fixing in general. This is completely unrelated to
> this bug. In fact, as we don't do any NCM control messages there in the

I see. In general this would be a problem.

> current resume, I'm not sure this firmware bug is triggered by it.  But
> it's untestable, because:

OK, something needs to be done, but this patch is not the place to do
it.

	Regards
		Oliver