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--- a/drivers/gpio/gpio-realtek-otto.c
+++ b/drivers/gpio/gpio-realtek-otto.c
@@ -304,6 +304,7 @@ static int realtek_gpio_irq_set_affinity
static int realtek_gpio_irq_init(struct gpio_chip *gc)
{
struct realtek_gpio_ctrl *ctrl = gpiochip_get_data(gc);
+ void __iomem *irq_cpu_mask;
unsigned int port;
int cpu;
@@ -311,8 +312,16 @@ static int realtek_gpio_irq_init(struct
realtek_gpio_write_imr(ctrl, port, 0, 0);
realtek_gpio_clear_isr(ctrl, port, GENMASK(7, 0));
- for_each_cpu(cpu, &ctrl->cpu_irq_maskable)
- iowrite8(GENMASK(7, 0), realtek_gpio_irq_cpu_mask(ctrl, port, cpu));
+ /*
+ * Uniprocessor builds assume a mask always contains one CPU,
+ * so only start the loop if we have at least one maskable CPU.
+ */
+ if(!cpumask_empty(&ctrl->cpu_irq_maskable)) {
+ for_each_cpu(cpu, &ctrl->cpu_irq_maskable) {
+ irq_cpu_mask = realtek_gpio_irq_cpu_mask(ctrl, port, cpu);
+ iowrite8(GENMASK(7, 0), irq_cpu_mask);
+ }
+ }
}
return 0;
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