Revert "gpio: Revert regression in sysfs-gpio (gpiolib.c)"

This reverts commit fc328a7.

This commit - while attempting to fix a regression - has caused a number
of other problems. As the fallout from it is more significant than the
initial problem itself, revert it for now before we find a correct
solution.

Link: https://lore.kernel.org/all/[email protected]/
Link: https://lore.kernel.org/stable/[email protected]/
Link: https://lore.kernel.org/all/[email protected]/
Signed-off-by: Bartosz Golaszewski <[email protected]>
Reported-and-bisected-by: Guenter Roeck <[email protected]>
Reported-by: Michael Walle <[email protected]>
Cc: Thorsten Leemhuis <[email protected]>
Cc: Marcelo Roberto Jimenez <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

Author: brgl

drivers/gpio/gpiolib.c

@@ -1701,6 +1701,11 @@ static inline void gpiochip_irqchip_free_valid_mask(struct gpio_chip *gc)
  */
 int gpiochip_generic_request(struct gpio_chip *gc, unsigned int offset)
 {
+#ifdef CONFIG_PINCTRL
+	if (list_empty(&gc->gpiodev->pin_ranges))
+		return 0;
+#endif
+
 	return pinctrl_gpio_request(gc->gpiodev->base + offset);
 }
 EXPORT_SYMBOL_GPL(gpiochip_generic_request);
@@ -1712,6 +1717,11 @@ EXPORT_SYMBOL_GPL(gpiochip_generic_request);
  */
 void gpiochip_generic_free(struct gpio_chip *gc, unsigned int offset)
 {
+#ifdef CONFIG_PINCTRL
+	if (list_empty(&gc->gpiodev->pin_ranges))
+		return;
+#endif
+
 	pinctrl_gpio_free(gc->gpiodev->base + offset);
 }
 EXPORT_SYMBOL_GPL(gpiochip_generic_free);