linux-kernel - Re: [PATCH 2/9] scripts/modpost: add a exception for USB gadget drivers

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Message-ID: <20120815201426.GA6902@merkur.ravnborg.org>
Date:	Wed, 15 Aug 2012 22:14:26 +0200
From:	Sam Ravnborg <sam@...nborg.org>
To:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:	Felipe Balbi <balbi@...com>, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/9] scripts/modpost: add a exception for USB gadget
	drivers

On Wed, Aug 15, 2012 at 09:59:12PM +0200, Sebastian Andrzej Siewior wrote:
> The "driver" struct for a gadget driver is named *_driver. On module
> load, the gadget expects a UDC driver to be loaded and avaiable. If this
> is not the case => -ENODEV and bye bye. That means that the gadget
> driver is initialized immediately. The initialization process includes
> calling ->bind() for the gadget driver. Therefore it is okay to put this
> in __init. It will never be called again, we don't (yet) allow two
> gadgets of the same kind to be ->bind() again.
> 
> Commit 07a18bd716 ("usb gadget: don't save bind callback in struct
> usb_composite_driver") move the ->bind() member from the struct to an
> argument.
> I'm reverting this and adding this exception. For g_zero we save around
> 400bytes. I'm not having the conversion about how important it is to
> save 400 bytes. I wait for configfs interface for the gadget subsystem.
> This will remove the __init from the ->bind() because we will be able to
> call ->bind() more than once and _after_ the init has been dropped.

Could you use the __ref / __refdata annotation?
This would be much cleaner than this hack in modpost.

	Sam
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