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

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Date:	Mon, 22 Jun 2009 08:34:31 -0600
From:	Matthew Wilcox <matthew@....cx>
To:	Alex Chiang <achiang@...com>
Cc:	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>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	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>
Subject: Re: [PATCH] PCI: remove pcibios_scan_all_fns()

On Mon, Jun 22, 2009 at 08:08:07AM -0600, Alex Chiang wrote:
> This was #define'd as 0 on all platforms, so let's get rid of it.
> 
> This change makes pci_scan_slot() slightly easier to read.

> diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
> index f1ae247..b613cad 100644
> --- a/drivers/pci/probe.c
> +++ b/drivers/pci/probe.c
> @@ -1056,8 +1056,7 @@ int pci_scan_slot(struct pci_bus *bus, int devfn)
>  	if (dev && !dev->is_added)	/* new device? */
>  		nr++;
>  
> -	if ((dev && dev->multifunction) ||
> -	    (!dev && pcibios_scan_all_fns(bus, devfn))) {
> +	if (dev && dev->multifunction) {
>  		for (fn = 1; fn < 8; fn++) {
>  			dev = pci_scan_single_device(bus, devfn + fn);
>  			if (dev) {

What a good idea.  I was just looking at making this more complicated
(due to the ARI capability).

I'd like to know what the KVM / Xen / ... people think about this.
I don't know if they rely on function 5 being able to show up out of
the blue.

Anyway,
Reviewed-by: Matthew Wilcox <willy@...ux.intel.com>

-- 
Matthew Wilcox				Intel Open Source Technology Centre
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours.  We can't possibly take such
a retrograde step."
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