[PATCH] sparseirq: fix for_each_irq_desc() nit

[KOSAKI Motohiro]

Raja reported for_each_irq_desc() has possibility unsafeness.
if anyone write folliwing code, for_each_irq_desc() doesn't works intetionally.
(Now, its code doesn't exist at all)

 if (safe)
   for_each_irq_desc(irq, desc) {
      ...
   }
 else
   panic();


Reported-by: Raja R Harinath <harinath@xxxxxxxxxxxx>
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
CC: Ingo Molnar <mingo@xxxxxxx>
CC: Yinghai Lu <yinghai@xxxxxxxxxx>
---
 include/linux/irqnr.h |    8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/include/linux/irqnr.h b/include/linux/irqnr.h
index 5504a5c..99b91c6 100644
--- a/include/linux/irqnr.h
+++ b/include/linux/irqnr.h
@@ -23,13 +23,17 @@ extern struct irq_desc *irq_to_desc(unsigned int irq);
 # define for_each_irq_desc(irq, desc)					\
 	for (irq = 0, desc = irq_to_desc(irq); irq < nr_irqs;		\
 	     irq++, desc = irq_to_desc(irq))				\
-		if (desc)
+		if (!desc)						\
+			;						\
+		else
 
 
 # define for_each_irq_desc_reverse(irq, desc)				\
 	for (irq = nr_irqs - 1, desc = irq_to_desc(irq); irq >= 0;	\
 	     irq--, desc = irq_to_desc(irq))				\
-		if (desc)
+		if (!desc)						\
+			;						\
+		else
 
 #endif /* CONFIG_GENERIC_HARDIRQS */
 
-- 
1.5.3




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