From fc1b253141b360f9c669d391b4ff663b984ef0c9 Mon Sep 17 00:00:00 2001
From: Andreas Noever <andreas.noever@gmail.com>
Date: Thu, 23 Jan 2014 21:59:28 +0100
Subject: [PATCH] PCI: Don't scan random busses in pci_scan_bridge()

When assigning a new bus number in pci_scan_bridge we check whether
max+1 is free by calling pci_find_bus. If it does already exist then we
assume that we are rescanning and that this is the right bus to scan.

This is fragile. If max+1 lies outside of bus->busn_res.end then we will
rescan some random bus from somewhere else in the hierachy. This patch
checks for this case and prints a warning.

[bhelgaas: add parent/child bus number info to dev_warn()]
Signed-off-by: Andreas Noever <andreas.noever@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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