linux-kernel - Re: [RESEND/PATCH] usb: gadget: goku

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Date:	Tue, 5 Oct 2010 18:53:48 +0200
From:	Dan Carpenter <error27@...il.com>
To:	Greg KH <gregkh@...e.de>
Cc:	Rahul Ruikar <rahul.ruikar@...il.com>,
	David Brownell <dbrownell@...rs.sourceforge.net>,
	nm127@...email.hu, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RESEND/PATCH] usb: gadget: goku_udc: Fix error path

On Tue, Oct 05, 2010 at 06:20:05AM -0700, Greg KH wrote:
> On Mon, Oct 04, 2010 at 02:22:14PM +0200, Dan Carpenter wrote:
> > On Mon, Oct 04, 2010 at 01:29:00AM +0530, Rahul Ruikar wrote:
> > > call put_device() when device_register() fails.
> > > 
> > 
> > Sorry I didn't realize what you were trying to do here.  This is not
> > correct at all.
> > 
> > The right thing is to fix device_register() to call put_device() itself.
> > It's a bit involved, because all the callers will need to be audited but
> > someone is working on this I think.
> 
> No, no one is working on this, and no, it's not possible to make this
> type of change to the driver core as discussed in the past due to the
> way struct device can be embedded within another structure.

Sorry I guess I lost track of the discussion.  We could write a helper
macro which added the extra put device on failure?  Isn't that the more
common case anyway?  To be honest, I'm still not clear on when the extra
put_device() is appropriate and when it's not.  :/  I'll look through
the archive.

Anyway, I would prefer a slightly different patch.  The logic is easier
to follow if we keep the put_device() right next to the
device_register().  Also if we keep it in one function and we add a
helper macro later then coccinelle can rewrite it automatically.

I'll send my patch.

regards,
dan carpenter
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