From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dave Jones Subject: Re: net: cdc_ncm, cdc_mbim: allow user to prefer NCM for backwards compatibility Date: Thu, 16 May 2013 15:17:01 -0400 Message-ID: <20130516191701.GC5805@redhat.com> References: <20130516182510.GA4728@redhat.com> <87mwrueo9k.fsf@nemi.mork.no> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: Linux Kernel Mailing List , netdev@vger.kernel.org, Fedora Kernel Team , Ben Hutchings To: =?iso-8859-1?Q?Bj=F8rn?= Mork Return-path: Received: from mx1.redhat.com ([209.132.183.28]:19985 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752495Ab3EPTRR (ORCPT ); Thu, 16 May 2013 15:17:17 -0400 Content-Disposition: inline In-Reply-To: <87mwrueo9k.fsf@nemi.mork.no> Sender: netdev-owner@vger.kernel.org List-ID: On Thu, May 16, 2013 at 09:08:23PM +0200, Bj=F8rn Mork wrote: > Yes, this is a very unfortunate side effect of the userspace/kernel > split of the MBIM driver combined with the NCM/MBIM "backwards > compatibility" setting. Which in itself is a bad idea, IMHO. >=20 > I recommend all distros do the same as Debian: Set NCM as default un= til > a userspace application with MBIM support is ready and packaged in t= he > distro: > http://anonscm.debian.org/viewvc/kernel/dists/trunk/linux/debian/pat= ches/debian/cdc_ncm-cdc_mbim-use-ncm-by-default.patch Thanks for the pointer. We'll pick that up for the Fedora 3.9 kernels. Ben, does debian have a commits mailing list for kernel changes ? > FWIW, I wish we would have thought about this issue before v3.8 was > released. Then we could have made that patch the mainline default, > without that being a userspace API change. But we didn't. >=20 > The good news is that Aleksander has done some nice work on the MBIM > support in ModemManager, so there is a good chance that the next rel= ease > will make this problem go away. good news indeed! thanks. Dave