Merge tag 'gpio-v4.13-3' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio

Pull GPIO fixes from Linus Walleij:
 "Here are the (hopefully) last GPIO fixes for v4.13:

   - an important core fix to reject invalid GPIOs *before* trying to
     obtain a GPIO descriptor for it.

   - a driver fix for the mvebu driver IRQ handling"

* tag 'gpio-v4.13-3' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio:
  gpio: mvebu: Fix cause computation in irq handler
  gpio: reject invalid gpio before getting gpio_desc

drivers/gpio/gpio-mvebu.c

@@ -557,7 +557,7 @@ static void mvebu_gpio_irq_handler(struct irq_desc *desc)
 	edge_cause = mvebu_gpio_read_edge_cause(mvchip);
 	edge_mask  = mvebu_gpio_read_edge_mask(mvchip);
 
-	cause = (data_in ^ level_mask) | (edge_cause & edge_mask);
+	cause = (data_in & level_mask) | (edge_cause & edge_mask);
 
 	for (i = 0; i < mvchip->chip.ngpio; i++) {
 		int irq;

drivers/gpio/gpiolib-sysfs.c

@@ -2,6 +2,7 @@
 #include <linux/mutex.h>
 #include <linux/device.h>
 #include <linux/sysfs.h>
+#include <linux/gpio.h>
 #include <linux/gpio/consumer.h>
 #include <linux/gpio/driver.h>
 #include <linux/interrupt.h>
@@ -432,6 +433,11 @@ static struct attribute *gpiochip_attrs[] = {
 };
 ATTRIBUTE_GROUPS(gpiochip);
 
+static struct gpio_desc *gpio_to_valid_desc(int gpio)
+{
+	return gpio_is_valid(gpio) ? gpio_to_desc(gpio) : NULL;
+}
+
 /*
  * /sys/class/gpio/export ... write-only
  *	integer N ... number of GPIO to export (full access)
@@ -450,7 +456,7 @@ static ssize_t export_store(struct class *class,
 	if (status < 0)
 		goto done;
 
-	desc = gpio_to_desc(gpio);
+	desc = gpio_to_valid_desc(gpio);
 	/* reject invalid GPIOs */
 	if (!desc) {
 		pr_warn("%s: invalid GPIO %ld\n", __func__, gpio);
@@ -493,7 +499,7 @@ static ssize_t unexport_store(struct class *class,
 	if (status < 0)
 		goto done;
 
-	desc = gpio_to_desc(gpio);
+	desc = gpio_to_valid_desc(gpio);
 	/* reject bogus commands (gpio_unexport ignores them) */
 	if (!desc) {
 		pr_warn("%s: invalid GPIO %ld\n", __func__, gpio);