linux-kernel - Re: [PATCH] pci: x86-32/64 switch to pci

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Message-ID: <20061016172341.GB5385@rhun.haifa.ibm.com>
Date:	Mon, 16 Oct 2006 19:23:41 +0200
From:	Muli Ben-Yehuda <muli@...ibm.com>
To:	Andi Kleen <ak@....de>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>, akpm@...l.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] pci: x86-32/64 switch to pci_get API

On Mon, Oct 16, 2006 at 06:07:59PM +0200, Andi Kleen wrote:
> > --- linux.vanilla-2.6.19-rc1-mm1/arch/x86_64/kernel/pci-calgary.c	2006-10-13 15:10:06.000000000 +0100
> > +++ linux-2.6.19-rc1-mm1/arch/x86_64/kernel/pci-calgary.c	2006-10-13 17:14:40.000000000 +0100
> > @@ -879,7 +879,7 @@
> >  
> >  error:
> >  	do {
> > -		dev = pci_find_device_reverse(PCI_VENDOR_ID_IBM,
> > +		dev = pci_get_device_reverse(PCI_VENDOR_ID_IBM,
> >  					      PCI_DEVICE_ID_IBM_CALGARY,
> >  					      dev);
> 
> No put call anywhere?

The put is implicit in the call, since for each dev returned from
pci_get_device_reverse() we then call it with the same dev as the last
('from') parameter. We take a reference to dev elsewhere, just before
we start using it.

In any case these bridges can't be hot-plugged, so as long as the ref
count remains positive, we're fine.

Cheers,
Muli
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