linux-kernel - Re: Can we remove pci_find

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Message-ID: <4B4F1073.5060903@imap.cc>
Date:	Thu, 14 Jan 2010 13:39:15 +0100
From:	Tilman Schmidt <tilman@...p.cc>
To:	Andi Kleen <andi@...stfloor.org>
CC:	Alan Cox <alan@...rguk.ukuu.org.uk>, Greg KH <gregkh@...e.de>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	LKML <linux-kernel@...r.kernel.org>, netdev@...r.kernel.org,
	Karsten Keil <isdn@...ux-pingi.de>,
	isdn4linux@...tserv.isdn4linux.de
Subject: Re: Can we remove pci_find_device() yet?

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Am 2010-01-14 12:03 schrieb Andi Kleen:
> On Thu, Jan 14, 2010 at 11:02:14AM +0000, Alan Cox wrote:
[It would be better to enforce this constraint at runtime.]
>> There is a simpler way to do that, which is to just leak a reference in
>> the hisax_find_pci_device hack. The pci_dev won't be going anywhere then.
> 
> You just have to do it once, otherwise it'll fail after 4 billion times.

I guess we could live with that. pci_find_device() or its successor, the
hisax_find_pci_device() hack, is only called during device setup, once
for most drivers and at the very most 24 times for hfc_pci. Someone
would have to rmmod/insmod a HiSax module more than a hundred million
times to accumulate four billion calls.

- -- 
Tilman Schmidt                    E-Mail: tilman@...p.cc
Bonn, Germany
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