From: Andreas Noever <andreas.noever@gmail.com>
Date: Tue, 16 Sep 2014 21:16:02 +0000 (-0600)
Subject: PCI: pciehp: Prevent NULL dereference during probe
X-Git-Tag: fixes-against-v3.18-rc2~139^2~11^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=bceee4a97eb58bd0e80e39eff11b506ddd9e7ad3;p=pandora-kernel.git

PCI: pciehp: Prevent NULL dereference during probe

pciehp assumes that dev->subordinate, the struct pci_bus for a bridge's
secondary bus, exists.  But we do not create that bus if we run out of bus
numbers during enumeration.  This leads to a NULL dereference in
init_slot() (and other places).

Change pciehp_probe() to return -ENODEV when no secondary bus is present.

Signed-off-by: Andreas Noever <andreas.noever@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
CC: stable@vger.kernel.org	# v3.2+
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