linux-kernel - Re: tq 2440

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Message-ID: <20100715171029.GK29322@n2100.arm.linux.org.uk>
Date:	Thu, 15 Jul 2010 18:10:29 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Greg KH <gregkh@...e.de>
Cc:	Conke Hu <conke.hu@...il.com>, CoffBeta <coffbeta@...il.com>,
	David Brownell <dbrownell@...rs.sourceforge.net>,
	inux kernel <linux-kernel@...r.kernel.org>,
	ext-jani.1.nikula@...ia.com,
	Uwe Kleine-K?nig <u.kleine-koenig@...gutronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: tq 2440

On Thu, Jul 15, 2010 at 09:51:41AM -0700, Greg KH wrote:
> On Thu, Jul 15, 2010 at 05:35:26PM +0100, Russell King - ARM Linux wrote:
> > On Thu, Jul 15, 2010 at 11:16:30PM +0800, Conke Hu wrote:
> > > ever notice to the following kernel log?
> > > "Device 's3c2440-nand' does not have a release() function, it is
> > > broken and must."
> > > release() function should be implemented  in the platform_device.
> > 
> > That's not telling you to provide a release function.  The warning is
> > telling you that a device is being unregistered which doesn't have a
> > release function.
> > 
> > Consider this point - maybe it doesn't have a release function because
> > it's not supposed to be unregistered?
> 
> Heh, well, it is being unregistered, and at that point in time, the
> kernel complains.

The unregistration occurs because platform_register_devices() (which is
used by arch code to register a block of platform devices) undoes its
work if one of the devices fails to register.

I've long since thought, since I created that function, that this probably
isn't desirable behaviour, and it should continue to register as many
devices as it possibly can.

> All kobjects need a release function that actually frees it.  If not,
> that is a logic bug.  Please see the Documentation/kobject.txt file for
> details.

How do you free a statically declared platform device?
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