genirq: fix off by one and coding style

Fix off-by-one in for_each_irq_desc_reverse().

Impact is near zero in practice, because nothing substantial wants to
iterate down to IRQ#0 - but fix it nevertheless.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 3 insertions, 3 deletions

diff --git a/include/linux/irqnr.h b/include/linux/irqnr.h
index 3171ddc3b39d..452c280c8115 100644
--- a/include/linux/irqnr.h
+++ b/include/linux/irqnr.h
@@ -13,9 +13,9 @@ extern int nr_irqs;
 # define for_each_irq_desc(irq, desc)           \
         for (irq = 0, desc = irq_desc; irq < nr_irqs; irq++, desc++)
 
-# define for_each_irq_desc_reverse(irq, desc)                   \
-        for (irq = nr_irqs -1, desc = irq_desc + (nr_irqs -1 ); \
-             irq > 0; irq--, desc--)
+# define for_each_irq_desc_reverse(irq, desc)                           \
+        for (irq = nr_irqs - 1, desc = irq_desc + (nr_irqs - 1);        \
+             irq >= 0; irq--, desc--)
 #endif
 
 #define for_each_irq_nr(irq)                    \