From 4fb88c1a28a8dc302bdc09858e7cdafc97bef794 Mon Sep 17 00:00:00 2001
From: Matthew Wilcox <matthew@wil.cx>
Date: Sun, 17 Jan 2010 14:01:41 -0700
Subject: [PATCH] PCI: Make pci_scan_slot more robust

Yinghai pointed out that the new pci_scan_slot() crashes when called
on an ARI-capable slot that is empty.  Fix this by exiting early from
pci_scan_slot if there is no device in the slot.

Also make next_ari_func() robust against devices not existing in case
the ARI capability is corrupt.  ARI also requires that the devices be
listed in order, so if we find a function listed that is out of order,
stop scanning to prevent loops.

Signed-off-by: Matthew Wilcox <matthew@wil.cx>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
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