linux-kernel - Re: [PATCH] virtio: make PCI devices take a virtio

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Message-Id: <200812051043.51417.rusty@rustcorp.com.au>
Date:	Fri, 5 Dec 2008 10:43:50 +1030
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Mark McLoughlin <markmc@...hat.com>
Cc:	"linux-kernel" <linux-kernel@...r.kernel.org>,
	kvm <kvm@...r.kernel.org>, Anthony Liguori <aliguori@...ibm.com>,
	Michael Tokarev <mjt@....msk.ru>,
	Jesse Barnes <jbarnes@...tuousgeek.org>
Subject: Re: [PATCH] virtio: make PCI devices take a virtio_pci module ref

On Thursday 04 December 2008 23:14:31 Mark McLoughlin wrote:
> Nothing takes a ref on virtio_pci, so even if you have
> devices in use, rmmod will attempt to unload the module.
> 
> Fix by simply making each device take a ref on the module.

Hi Mark,

   Taking a reference to oneself is almost always wrong.  I'm a little
surprised that a successful call to pci_device->probe doesn't bump the
module count though.

Jesse?

Thanks,
Rusty.
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