From: Rob Herring <rob.herring@calxeda.com>
Date: Tue, 20 Sep 2011 18:02:54 +0000 (-0500)
Subject: of/irq: of_irq_find_parent: check for parent equal to child
X-Git-Tag: v3.2-rc1~150^2~6^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=dc9372808412edbc653a675a526c2ee6c0c14a91;p=pandora-kernel.git

of/irq: of_irq_find_parent: check for parent equal to child

An interrupt controller may often implicitly inherit itself from a parent
node when in fact the controller is the interrupt root controller. Guard
against the case of child == parent and return NULL in this case.

This can also be fixed by adding an explicit "interrupt-parent;" to a root
interrupt controller node.

Based on code from Grant Likely.

Signed-off-by: Rob Herring <rob.herring@calxeda.com>
Cc: Grant Likely <grant.likely@secretlab.ca>
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