irqchip: crossbar: Dont use '0' to mark reserved interrupts

Today '0' is actually reserved, but may not be the same in the future.

So, use a flag to mark the GIC interrupts that are reserved.

Signed-off-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Sricharan R <r.sricharan@ti.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Link: https://lkml.kernel.org/r/1403766634-18543-2-git-send-email-r.sricharan@ti.com
Signed-off-by: Jason Cooper <jason@lakedaemon.net>

1 files changed, 3 insertions, 2 deletions

diff --git a/drivers/irqchip/irq-crossbar.c b/drivers/irqchip/irq-crossbar.c
index 3d15d16a7088..20105bcdf408 100644
--- a/drivers/irqchip/irq-crossbar.c
+++ b/drivers/irqchip/irq-crossbar.c
@@ -17,6 +17,7 @@
 #include <linux/irqchip/arm-gic.h>
 
 #define IRQ_FREE        -1
+#define IRQ_RESERVED    -2
 #define GIC_IRQ_START   32
 
 /*
@@ -139,7 +140,7 @@ static int __init crossbar_of_init(struct device_node *node)
                                 pr_err("Invalid reserved entry\n");
                                 goto err3;
                         }
-                        cb->irq_map[entry] = 0;
+                        cb->irq_map[entry] = IRQ_RESERVED;
                 }
         }
 
@@ -170,7 +171,7 @@ static int __init crossbar_of_init(struct device_node *node)
          * reserved irqs. so find and store the offsets once.
          */
         for (i = 0; i < max; i++) {
-                if (!cb->irq_map[i])
+                if (cb->irq_map[i] == IRQ_RESERVED)
                         continue;
 
                 cb->register_offsets[i] = reserved;