gpio: fix memory leak and sleep-while-atomic

commit 00acc3dc upstream.

Fix memory leak and sleep-while-atomic in gpiochip_remove.

The memory leak was introduced by afa82fab ("gpio / ACPI: Move event
handling registration to gpiolib irqchip helpers") that moved the
release of acpi interrupt resources to gpiochip_irqchip_remove, but by
then the resources are no longer accessible as the acpi_gpio_chip has
already been freed by acpi_gpiochip_remove.

Note that this also fixes a few potential sleep-while-atomics, which has
been around since 14250520 ("gpio: add IRQ chip helpers in gpiolib")
when the call to gpiochip_irqchip_remove while holding a spinlock was
added (a couple of irq-domain paths can end up grabbing mutexes).

Fixes: afa82fab ("gpio / ACPI: Move event handling registration to
gpiolib irqchip helpers")
Fixes: 14250520 ("gpio: add IRQ chip helpers in gpiolib")
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>

drivers/gpio/gpiolib.c

@@ -1272,11 +1272,12 @@ int gpiochip_remove(struct gpio_chip *chip)
 	int		status = 0;
 	unsigned	id;
 
+	gpiochip_irqchip_remove(chip);
+
 	acpi_gpiochip_remove(chip);
 
 	spin_lock_irqsave(&gpio_lock, flags);
 
-	gpiochip_irqchip_remove(chip);
 	gpiochip_remove_pin_ranges(chip);
 	of_gpiochip_remove(chip);