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If we have a reference to irq_desc already, there is no point to do another lookup. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Jiang Liu <jiang.liu@linux.intel.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: Bjorn Helgaas <bhelgaas@google.com> Link: http://lkml.kernel.org/r/20150802203609.638130301@linutronix.de Signed-off-by: Thomas Gleixner <tglx@linutronix.de>