gpiolib: Introduce for_each_gpio_desc_with_flag() macro

In a few places we are using a loop against all GPIO descriptors
with a given flag for a given device. Replace it with a consolidated
for_each type of macro.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>

drivers/gpio/gpiolib-of.c

@@ -711,14 +711,12 @@ static int of_gpiochip_scan_gpios(struct gpio_chip *chip)
 static void of_gpiochip_remove_hog(struct gpio_chip *chip,
 				   struct device_node *hog)
 {
-	struct gpio_desc *descs = chip->gpiodev->descs;
+	struct gpio_desc *desc;
 	unsigned int i;
 
-	for (i = 0; i < chip->ngpio; i++) {
-		if (test_bit(FLAG_IS_HOGGED, &descs[i].flags) &&
-		    descs[i].hog == hog)
-			gpiochip_free_own_desc(&descs[i]);
-	}
+	for_each_gpio_desc_with_flag(i, chip, desc, FLAG_IS_HOGGED)
+		if (desc->hog == hog)
+			gpiochip_free_own_desc(desc);
 }
 
 static int of_gpiochip_match_node(struct gpio_chip *chip, void *data)

drivers/gpio/gpiolib-sysfs.c

@@ -793,11 +793,8 @@ void gpiochip_sysfs_unregister(struct gpio_device *gdev)
 	mutex_unlock(&sysfs_lock);
 
 	/* unregister gpiod class devices owned by sysfs */
-	for (i = 0; i < chip->ngpio; i++) {
-		desc = &gdev->descs[i];
-		if (test_and_clear_bit(FLAG_SYSFS, &desc->flags))
+	for_each_gpio_desc_with_flag(i, chip, desc, FLAG_SYSFS)
 		gpiod_free(desc);
-	}
 }
 
 static int __init gpiolib_sysfs_init(void)

drivers/gpio/gpiolib.c

@@ -4102,12 +4102,11 @@ int gpiod_hog(struct gpio_desc *desc, const char *name,
  */
 static void gpiochip_free_hogs(struct gpio_chip *gc)
 {
+	struct gpio_desc *desc;
 	int id;
 
-	for (id = 0; id < gc->ngpio; id++) {
-		if (test_bit(FLAG_IS_HOGGED, &gc->gpiodev->descs[id].flags))
-			gpiochip_free_own_desc(&gc->gpiodev->descs[id]);
-	}
+	for_each_gpio_desc_with_flag(id, gc, desc, FLAG_IS_HOGGED)
+		gpiochip_free_own_desc(desc);
 }
 
 /**

drivers/gpio/gpiolib.h

@@ -82,6 +82,13 @@ struct gpio_array {
 };
 
 struct gpio_desc *gpiochip_get_desc(struct gpio_chip *gc, unsigned int hwnum);
+
+#define for_each_gpio_desc_with_flag(i, gc, desc, flag)		\
+	for (i = 0, desc = gpiochip_get_desc(gc, i);		\
+	     i < gc->ngpio;					\
+	     i++, desc = gpiochip_get_desc(gc, i))		\
+		if (!test_bit(flag, &desc->flags)) {} else
+
 int gpiod_get_array_value_complex(bool raw, bool can_sleep,
 				  unsigned int array_size,
 				  struct gpio_desc **desc_array,