ARM: 6524/1: GIC irq desciptor bug fix

gic_set_cpu will directly use irq_desc[]. If CONFIG_SPARSE_IRQ is
enabled, there is no irq_desc[]. So we need use irq_to_desc(irq) to
get the descriptor for irq.

Signed-off-by: Chao Xie <chao.xie@marvell.com>
Acked-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 7 insertions, 1 deletions

diff --git a/arch/arm/common/gic.c b/arch/arm/common/gic.c
index fea1bd7249b6..e6388dcd8cfa 100644
--- a/arch/arm/common/gic.c
+++ b/arch/arm/common/gic.c
@@ -146,9 +146,15 @@ static int gic_set_cpu(unsigned int irq, const struct cpumask *mask_val)
         unsigned int shift = (irq % 4) * 8;
         unsigned int cpu = cpumask_first(mask_val);
         u32 val;
+        struct irq_desc *desc;
 
         spin_lock(&irq_controller_lock);
-        irq_desc[irq].node = cpu;
+        desc = irq_to_desc(irq);
+        if (desc == NULL) {
+                spin_unlock(&irq_controller_lock);
+                return -EINVAL;
+        }
+        desc->node = cpu;
         val = readl(reg) & ~(0xff << shift);
         val |= 1 << (cpu + shift);
         writel(val, reg);