linux-kernel - [PATCH V3 01/16] irqchip: crossbar: dont use '0' to mark reserved interrupts

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Message-ID: <1402917796-31574-2-git-send-email-r.sricharan@ti.com>
Date:	Mon, 16 Jun 2014 16:53:01 +0530
From:	Sricharan R <r.sricharan@...com>
To:	<linux-omap@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:	<tony@...mide.com>, <santosh.shilimkar@...com>, <nm@...com>,
	<rnayak@...com>, <linux@....linux.org.uk>, <r.sricharan@...com>,
	<tglx@...utronix.de>, <jason@...edaemon.net>, <joe@...ches.com>
Subject: [PATCH V3 01/16] irqchip: crossbar: dont use '0' to mark reserved interrupts

From: Nishanth Menon <nm@...com>

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@...com>
Signed-off-by: Sricharan R <r.sricharan@...com>
---
 drivers/irqchip/irq-crossbar.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/irqchip/irq-crossbar.c b/drivers/irqchip/irq-crossbar.c
index 3d15d16..20105bc 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;
-- 
1.7.9.5

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