Revert "of/irq: of_irq_find_parent: check for parent equal to child"
This reverts commit dc9372808412edbc653a675a526c2ee6c0c14a91.
As requested by Ben Herrenschmidt:
"This breaks some powerpc platforms at least. The practice of having
a node provide an explicit "interrupt-parent" property pointing to
itself is an old trick that we've used in the past to allow a
device-node to have interrupts routed to different controllers.
In that case, the node also contains an interrupt-map, so the node is
its own parent, the interrupt resolution hits the map, which then can
route each individual interrupt to a different parent."
"Ah, nuts, yes that is broken then. Yes, please revert the commit and
Rob & I will come up with a better solution.
Rob, I think it can be done by explicitly checking for np ==
desc->interrupt_parent in of_irq_init() instead of relying on
of_irq_find_parent() returning NULL."
Requested-by: Benjamin Herrenschmidt <email@example.com>
Acked-by: Grant Likely <firstname.lastname@example.org>
Cc: Rob Herring <email@example.com>
Cc: linuxppc-dev <firstname.lastname@example.org>
Cc: Tanmay Inamdar <email@example.com>
Signed-off-by: Linus Torvalds <firstname.lastname@example.org>
1 file changed