linux-kernel - Re: [RFC] Pushing device/driver binding decisions to userspace

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Date:	Sun, 12 Nov 2006 17:47:05 -0800
From:	Nicholas Miell <nmiell@...cast.net>
To:	Ben Collins <ben.collins@...ntu.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [RFC] Pushing device/driver binding decisions to userspace

On Sun, 2006-11-12 at 17:24 -0800, Ben Collins wrote:
> On Sun, 2006-11-12 at 16:49 -0800, Nicholas Miell wrote:
> > On Sun, 2006-11-12 at 15:39 -0800, Ben Collins wrote:
> > 
> > What's wrong with making udev or whatever unbind driver A and then bind
> > driver B if the driver bound by the kernel ends up being the wrong
> > choice? (Besides the inelegance of the kernel choosing one and then
> > userspace immediately choosing the other, of course.)
> > 
> > I'd argue that having multiple drivers for the same hardware is a bit
> > strange to begin with, but that's another issue entirely.
> 
> If two drivers are loaded for the same device, there's no way for udev
> to tell the kernel which driver to use for a device, that I know of.

/sys/bus/*/drivers/*/{bind,unbind}

> Also, that just sounds very horrible to do. If you have udev/dbus events
> flying around for "device present", "device gone", "device present",
> then it could make for a very ugly user experience (think of programs to
> handle devices being started because of these events).

So don't fire the events until after the final binding.

-- 
Nicholas Miell <nmiell@...cast.net>

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