From: Bjorn Helgaas <bhelgaas@google.com>
Date: Tue, 24 Sep 2013 21:14:57 +0000 (-0600)
Subject: PCI: Document reason for using pci_is_root_bus()
X-Git-Tag: v3.13-rc1~95^2~9^2~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=77a0dfcd8a4d9a93a21c8be56eaeb65cd69b351d;p=pandora-kernel.git

PCI: Document reason for using pci_is_root_bus()

Some code assumes "bus->self == NULL" means the bus is a root bus.  This
adds a comment explaining why this is incorrect ("virtual" buses added for
SR-IOV have "bus->self == NULL" but are not root buses).

No functional change.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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