From 67b24970cef90b6d230e370cce9db8c29b2f4d74 Mon Sep 17 00:00:00 2001
From: Bin Meng <bmeng.cn@gmail.com>
Date: Mon, 25 May 2015 22:35:07 +0800
Subject: x86: Do sanity test on pirq table before writing

If pirq_routing_table points to NULL, that means U-Boot fails to
generate the table before in create_pirq_routing_table(), so we
test it against NULL before actually writing it.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>

diff --git a/arch/x86/cpu/irq.c b/arch/x86/cpu/irq.c
index d1711af..74b89ad 100644
--- a/arch/x86/cpu/irq.c
+++ b/arch/x86/cpu/irq.c
@@ -209,5 +209,8 @@ void pirq_init(void)
 
 u32 write_pirq_routing_table(u32 addr)
 {
+	if (!pirq_routing_table)
+		return addr;
+
 	return copy_pirq_routing_table(addr, pirq_routing_table);
 }
-- 
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