1 files changed, 23 insertions, 2 deletions

diff --git a/drivers/irqchip/irq-gic.c b/drivers/irqchip/irq-gic.c
index 69d9a395d54c..644d72468423 100644
--- a/drivers/irqchip/irq-gic.c
+++ b/drivers/irqchip/irq-gic.c
@@ -353,6 +353,25 @@ void __init gic_cascade_irq(unsigned int gic_nr, unsigned int irq)
         irq_set_chained_handler(irq, gic_handle_cascade_irq);
 }
 
+static u8 gic_get_cpumask(struct gic_chip_data *gic)
+{
+        void __iomem *base = gic_data_dist_base(gic);
+        u32 mask, i;
+
+        for (i = mask = 0; i < 32; i += 4) {
+                mask = readl_relaxed(base + GIC_DIST_TARGET + i);
+                mask |= mask >> 16;
+                mask |= mask >> 8;
+                if (mask)
+                        break;
+        }
+
+        if (!mask)
+                pr_crit("GIC CPU mask not found - kernel will fail to boot.\n");
+
+        return mask;
+}
+
 static void __init gic_dist_init(struct gic_chip_data *gic)
 {
         unsigned int i;
@@ -371,7 +390,9 @@ static void __init gic_dist_init(struct gic_chip_data *gic)
         /*
          * Set all global interrupts to this CPU only.
          */
-        cpumask = readl_relaxed(base + GIC_DIST_TARGET + 0);
+        cpumask = gic_get_cpumask(gic);
+        cpumask |= cpumask << 8;
+        cpumask |= cpumask << 16;
         for (i = 32; i < gic_irqs; i += 4)
                 writel_relaxed(cpumask, base + GIC_DIST_TARGET + i * 4 / 4);
 
@@ -402,7 +423,7 @@ static void __cpuinit gic_cpu_init(struct gic_chip_data *gic)
          * Get what the GIC says our CPU mask is.
          */
         BUG_ON(cpu >= NR_GIC_CPU_IF);
-        cpu_mask = readl_relaxed(dist_base + GIC_DIST_TARGET + 0);
+        cpu_mask = gic_get_cpumask(gic);
         gic_cpu_map[cpu] = cpu_mask;
 
         /*