linux-kernel - Re: [PATCH] PCI: remove pcibios_scan_all

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Date:	Tue, 23 Jun 2009 10:33:53 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Matthew Wilcox <matthew@....cx>, Alex Chiang <achiang@...com>,
	jbarnes@...tuousgeek.org, linux-arch@...r.kernel.org,
	Kyle McMartin <kyle@...artin.ca>,
	Tony Luck <tony.luck@...el.com>,
	Russell King <linux@....linux.org.uk>,
	Arnd Bergmann <arnd@...db.de>,
	Yoshinori Sato <ysato@...rs.sourceforge.jp>,
	Jeff Dike <jdike@...toit.com>, linux-kernel@...r.kernel.org,
	Ralf Baechle <ralf@...ux-mips.org>,
	David Howells <dhowells@...hat.com>,
	Paul Mundt <lethal@...ux-sh.org>,
	Ivan Kokshaysky <ink@...assic.park.msu.ru>,
	Ingo Molnar <mingo@...hat.com>,
	"David S. Miller" <davem@...emloft.net>,
	Avi Kivity <avi@...hat.com>
Subject: Re: [PATCH] PCI: remove pcibios_scan_all_fns()

On Mon, 2009-06-22 at 16:55 -0700, Jeremy Fitzhardinge wrote:
> 
> I wonder if that would upset drivers.  Assuming they can cope with just
> being given some functions, how could one generically make a function
> look present-but-dummy enough to not upset the driver?

Well, the dummy function would have a totally different vid/did, I think
that would work. In general, while I've seen drivers that -do- need to
know their real function number to get to the right registers, I haven't
seen much that also need to see function 0 "right" (or if they do, then
function 0 just needs to be plugged in the same partition and the whole
problem is somewhat moot).

Cheers,
Ben.

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