linux-kernel - Re: various vmbus review comments

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Message-ID: <20110509143352.GB29635@infradead.org>
Date:	Mon, 9 May 2011 10:33:52 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	KY Srinivasan <kys@...rosoft.com>
Cc:	Greg KH <greg@...ah.com>, "gregkh@...e.de" <gregkh@...e.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	"virtualization@...ts.osdl.org" <virtualization@...ts.osdl.org>
Subject: Re: various vmbus review comments

On Fri, May 06, 2011 at 01:10:38PM +0000, KY Srinivasan wrote:
> I audited the block and the net drivers. As part of their exit routine,
> they invoke vmbus_child_driver_unregister() after properly cleaning
> up all the devices they are managing. Do you still see an issue with
> regards to module reference counting.

Which is not the correct thing to do as explained in my last round
of reviews.  Take a look at the PCI code - the functional driver only
does a foo_untegister_driver (which maps almost directly to
driver_unregister), which then causes the device core to unbind the
devices.  The function driver must never call device_unregister
directly as the device continues to exist even if no driver is bound to
it.

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