[U-Boot] [PATCH 4/4] x86: Do sanity test on pirq table before writing

[Bin Meng]

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 at gmail.com>
---

 arch/x86/cpu/irq.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/x86/cpu/irq.c b/arch/x86/cpu/irq.c
index 32dc6f2..ce6334b 100644
--- a/arch/x86/cpu/irq.c
+++ b/arch/x86/cpu/irq.c
@@ -217,5 +217,8 @@ 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);
 }
-- 
1.8.2.1