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  6. 22 Nov, 2011 1 commit
    • Linus Torvalds's avatar
      Revert "of/irq: of_irq_find_parent: check for parent equal to child" · b4bbb029
      Linus Torvalds authored
      This reverts commit dc937280.
      
      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."
      
      Grant says:
        "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: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
      Acked-by: default avatarGrant Likely <grant.likely@secretlab.ca>
      Cc: Rob Herring <rob.herring@calxeda.com>
      Cc: devicetree-discuss@lists.ozlabs.org
      Cc: linuxppc-dev <linuxppc-dev@lists.ozlabs.org>
      Cc: Tanmay Inamdar <tinamdar@apm.com>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      b4bbb029