gpio: ep93xx: Use for_each_set_bit() in IRQ handler

This simplifies and standardizes the AB IRQ handler by using
the for_each_set_bit() library function.
Acked-by: Alexander Sverdlin <alexander.sverdlin@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/gpio/gpio-ep93xx.c

@@ -105,26 +105,22 @@ static void ep93xx_gpio_ab_irq_handler(struct irq_desc *desc)
 	struct gpio_chip *gc = irq_desc_get_handler_data(desc);
 	struct ep93xx_gpio *epg = gpiochip_get_data(gc);
 	struct irq_chip *irqchip = irq_desc_get_chip(desc);
-	unsigned char status;
-	int i;
+	unsigned long stat;
+	int offset;
 
 	chained_irq_enter(irqchip, desc);
 
-	status = readb(epg->base + EP93XX_GPIO_A_INT_STATUS);
-	for (i = 0; i < 8; i++) {
-		if (status & (1 << i)) {
-			int gpio_irq = gpio_to_irq(0) + i;
+	stat = readb(epg->base + EP93XX_GPIO_A_INT_STATUS);
+	for_each_set_bit(offset, &stat, 8) {
+		int gpio_irq = gpio_to_irq(0) + offset;
 		generic_handle_irq(gpio_irq);
 	}
-	}
 
-	status = readb(epg->base + EP93XX_GPIO_B_INT_STATUS);
-	for (i = 0; i < 8; i++) {
-		if (status & (1 << i)) {
-			int gpio_irq = gpio_to_irq(8) + i;
+	stat = readb(epg->base + EP93XX_GPIO_B_INT_STATUS);
+	for_each_set_bit(offset, &stat, 8) {
+		int gpio_irq = gpio_to_irq(8) + offset;
 		generic_handle_irq(gpio_irq);
 	}
-	}
 
 	chained_irq_exit(irqchip, desc);
 }