linux-kernel - Re: [PATCH] driver core: Early dev

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Date:	Tue, 9 Mar 2010 18:37:27 -0800
From:	Greg KH <greg@...ah.com>
To:	Paul Mundt <lethal@...ux-sh.org>
Cc:	Magnus Damm <damm@...nsource.se>, linux-kernel@...r.kernel.org,
	linux-sh@...r.kernel.org
Subject: Re: [PATCH] driver core: Early dev_name() support.

On Tue, Mar 09, 2010 at 03:57:53PM +0900, Paul Mundt wrote:
> Presently early platform devices suffer from the fact they are unable to
> use dev_xxx() calls early on due to dev_name() and others being
> unavailable at the time ->probe() is called.
> 
> This implements early init_name construction from the matched name/id
> pair following the semantics of the late device/driver match. As a
> result, matched IDs (inclusive of requested ones) are preserved when the
> handoff from the early platform code happens at kobject initialization
> time.
> 
> Since we still require kmalloc slabs to be available at this point, using
> kstrdup() for establishing the init_name works fine. This subsequently
> needs to be tested from dev_name() prior to the init_name being cleared
> by the driver core. We don't kfree() since others will already have a
> handle on the string long before the kobject initialization takes place.
> 
> This is also needed to permit drivers to use the clock framework early,
> without having to manually construct their own device IDs from the match
> id/name pair locally (needed by the early console and timer code on sh
> and arm).

Is this change something that we need for .34?  Or can it wait for .35?

thanks,

greg k-h
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