tree 5c6a2252c1de2720e7783a48f5b144003176cf65
parent f910b831c9647d85dc6f13e3b8698d10cbfd5011
author Rob Herring <rob.herring@calxeda.com> 1316541774 -0500
committer Rob Herring <rob.herring@calxeda.com> 1317818377 -0500

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>