linux-kernel - Re: [REGRESSION] "bind" a device to a driver doesn't not work anymore

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Message-ID: <20091012195808.GA10684@suse.de>
Date:	Mon, 12 Oct 2009 12:58:08 -0700
From:	Greg KH <gregkh@...e.de>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:	Éric Piel <eric.piel@...mplin-utc.net>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-input@...r.kernel.org
Subject: Re: [REGRESSION] "bind" a device to a driver doesn't not work
 anymore

On Mon, Oct 12, 2009 at 12:20:46PM -0700, Dmitry Torokhov wrote:
> On Mon, Oct 12, 2009 at 11:54:17AM -0700, Greg KH wrote:
> > On Mon, Oct 12, 2009 at 11:33:13AM -0700, Dmitry Torokhov wrote:
> > > On Mon, Oct 12, 2009 at 10:35:51AM -0700, Greg KH wrote:
> > > > On Mon, Oct 12, 2009 at 08:48:46AM -0700, Dmitry Torokhov wrote:
> > > > > > So at least, unbind should fail as well as bind.
> > > > > >
> > > > > 
> > > > > That would be Greg's domain s it is driver core decision whether to
> > > > > allow unbinding platform devices registered with
> > > > > platform_driver_probe().
> > > > 
> > > > No, I do not see why that should not be allowed.
> > > > 
> > > 
> > > Because once you did unbind the device you are stuck (unless the driver
> > > is compiled as a module, but then you could just unload the module
> > > instead of unbinding). Disallowing unbind would allow discarding not
> > > only __devinit but __devexit sections when driver is built in which
> > > would make ebedded people happy[^Hier].
> > 
> > Yeah, good point.
> > 
> > Does anyone do bind/unbind with platform devices today?
> > 
> 
> Greg, meet Eric ;)

Heh, yes, I mean for a "useful" thing :)

Eric is trying to do this to resolve a bug in the driver, not a thing
that is "normally" done for platform devices.

> Although I'd really want to fix the resume issue so it works out of the
> box without needing to bind/unbind or reload i8042.

I agree.

thanks,

greg k-h
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