linux-kernel - RE: 答复: [PATCH] USB: storage: fix Huawei mode switching regression

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Date:	Thu, 7 Mar 2013 02:54:38 +0000
From:	"Fangxiaozhi (Franko)" <fangxiaozhi@...wei.com>
To:	Dan Williams <dcbw@...hat.com>,
	Greg KH <gregkh@...uxfoundation.org>
CC:	"Linlei (Lei Lin)" <lei.lin@...wei.com>,
	Bjørn Mork <bjorn@...k.no>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Xueguiying (Zihan)" <zihan.xue@...wei.com>,
	"Yili (Neil)" <neil.yi@...wei.com>,
	Wangyuhua <yuhua.wang@...wei.com>,
	"Huqiao (C)" <huqiao36@...wei.com>, "balbi@...com" <balbi@...com>,
	"mdharm-usb@...-eyed-alien.net" <mdharm-usb@...-eyed-alien.net>,
	"sebastian@...akpoint.cc" <sebastian@...akpoint.cc>,
	stable <stable@...r.kernel.org>
Subject: RE: 答复: [PATCH] USB: storage: fix Huawei mode switching regression

Dear All：
	As far as I know, except switching in kernel, there isn't any mode switch solution on Android now.
	Do you have any good ideas for the mode switch on Android system?
Best Regards,
Franko Fang
> -----Original Message-----
> From: Dan Williams [mailto:dcbw@...hat.com]
> Sent: Wednesday, March 06, 2013 11:46 PM
> To: Greg KH
> Cc: Linlei (Lei Lin); Bjørn Mork; linux-usb@...r.kernel.org;
> linux-kernel@...r.kernel.org; Xueguiying (Zihan); Yili (Neil); Wangyuhua;
> Huqiao (C); balbi@...com; mdharm-usb@...-eyed-alien.net;
> sebastian@...akpoint.cc; stable; Fangxiaozhi (Franko)
> Subject: Re: 答复: [PATCH] USB: storage: fix Huawei mode switching
> regression
> 
> On Wed, 2013-03-06 at 09:44 +0800, Greg KH wrote:
> > On Wed, Mar 06, 2013 at 01:34:44AM +0000, Linlei (Lei Lin) wrote:
> > > Hello Mork,
> > >
> > > >> ------ Because in the embedded linux system, Android, or Chrome
> > > >> OS, etc. They don't integrate userspace usb_modeswitch utility
> > > >> for switching.
> > >
> > > >Why not?  If they can upgrade the kernel, then they most certainly can
> install a userspace utility.
> > >
> > > >There is no excuse for an embedded system to do this differently.
> > > >Please see e.g. OpenWRT as an example of an embedded system doing
> this correctly.
> > >
> > > But currently Android and Chrome OS has not integrated the
> > > usb_modeswitch utility.
> >
> > That is not a kernel problem.  I find it hard to believe that Chrome
> > OS would not gladly accept code to resolve this issue, can't you put
> > it into the modemmanager or whatever Chrome OS uses to handle their
> > wireless modems?
> 
> They use ModemManager, and that's still not the best place to put
> modeswitching.  The best place to modeswitch anything is usb_modeswitch.
> No sense duplicating the functionality that usb_modeswitch already supplies.
> 
> Dan
> 
> >
> > As for Android, sorry, you are on your own, you will just have to deal
> > with the individual OEMs that are incorporating your hardware :(
> >
> > > From a vendor's point of view, our purpose is to make our devices be
> > > supported natively by those OS.
> >
> > We have a solution, usb_modeswitch, any user should be using that.
> >
> > > So we consider that add the switch function to the kernel resolves
> > > the problem from the source.
> > > Then this function will be inherited by Android & Chrome OS.
> >
> > Don't circumvent horribly governed userspace projects by getting
> > changes into the Linux kernel.  Go fix those projects instead.
> >
> > Good luck,
> >
> > greg k-h
> > --
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>