linux-kernel - Re: various vmbus review comments

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Date:	Tue, 10 May 2011 06:16:15 -0700
From:	Greg KH <gregkh@...e.de>
To:	KY Srinivasan <kys@...rosoft.com>
Cc:	Christoph Hellwig <hch@...radead.org>, Greg KH <greg@...ah.com>,
	"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 Tue, May 10, 2011 at 01:00:26PM +0000, KY Srinivasan wrote:
> 
> 
> > -----Original Message-----
> > From: Christoph Hellwig [mailto:hch@...radead.org]
> > Sent: Tuesday, May 10, 2011 1:24 AM
> > To: KY Srinivasan
> > Cc: Christoph Hellwig; Greg KH; gregkh@...e.de; linux-kernel@...r.kernel.org;
> > devel@...uxdriverproject.org; virtualization@...ts.osdl.org
> > Subject: Re: various vmbus review comments
> > 
> > On Mon, May 09, 2011 at 02:56:52PM +0000, KY Srinivasan wrote:
> > > I will address this. Greg had a concern about module reference counting
> > > and looking at the current code, it did not appear to be an issue. The
> > > change you are suggesting will not affect the vmbus core which is what I want
> > > to focus on. I will however, fix this issue in the current round of patches I will
> > > send out this week.
> > 
> > It very clearly affects the interface between the core and the
> > functional drivers.  Trying to submit the core without making sure the
> > interface is exports works properly is not an overly good idea.
> 
> I must be missing something here. As I look at the block driver (and
> this is indicative of other drivers as well); the exit routine -
> blkvsc_drv_exit, first iterates through all the devices it manages
> and invokes device_unregister() on each of the devices and then 
> invokes vmbus_child_driver_unregister() which is just a wrapper on
> driver_unregister(). So, if I understand you correctly, you want the devices to
> persist even if there is no driver bound to them.

That's how the Linux driver model should be used, so yes, that is the
correct thing to do.

thanks,

greg k-h
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