linux-kernel - Re: Disable bus's drivers_autoprobe before rootfs has mounted

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Message-ID: <Pine.LNX.4.44L0.1406111520270.890-100000@iolanthe.rowland.org>
Date:	Wed, 11 Jun 2014 15:27:13 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Greg KH <gregkh@...uxfoundation.org>
cc:	Peter Chen <peter.chen@...escale.com>, <linux-usb@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: Disable bus's drivers_autoprobe before rootfs has mounted

On Wed, 11 Jun 2014, Greg KH wrote:

> We can't break existing systems, so I don't understand the issue here.
> Just don't configure your kernel for a system you don't have / want,
> right?
> 
> > > > From what I read code, we can't implement above feature, but I may
> > > > be wrong, if you have some solutions, give me some hints please.
> > > > If there is no solution for above feature, do we agree with exporting
> > > > .drivers_autoprobe for bus driver or something similar?
> > > 
> > > I don't understand what you mean by this, care to show me with code?
> > 
> > I mean the individual bus driver can't change bus->p->drivers_autoprobe?
> > bus->p->drivers_autoprobe is handled at drivers/base/bus.c.
> > 
> > If the individual bus driver can change bus->p->drivers_autoprobe, we
> > can disable autoprobe (auto-binding) during booting.
> 
> No, that's a core only thing.

Peter, correct me if this is wrong.  It sounds like you want to have a 
way for the user to control which gadget driver gets bound to which UDC 
driver when everything is compiled into the kernel, nothing is built 
as a separate module.  Is that the basic idea?

This shouldn't be a problem if you use configfs or libusbg.

Alan Stern

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