[PATCH v13 08/13] gpio: regmap: remove gpiochip before tearing down irqchip

[Long Zhao via B4 Relay <devnull+longzhao.ambarella.com@kernel.org>]

From: Long Zhao <longzhao@ambarella.com>

gpio_regmap_unregister() currently calls regmap_del_irq_chip() before
gpiochip_remove(). That disposes the mapped virtual IRQs and frees the
irq_domain while ACPI GPIO-signaled events may still be requested and
while gpiod_free_irqs() still needs gc->irq.domain.

Remove the gpio_chip first so ACPI teardown and USED_AS_IRQ cleanup run
against a live domain, then delete the regmap irqchip. Use the same
order on the registration error path, which previously leaked the
irqchip when gpiochip_irqchip_add_domain() failed after
regmap_add_irq_chip_fwnode().

Cc: Michael Walle <mwalle@kernel.org>
Signed-off-by: Long Zhao <longzhao@ambarella.com>
---
 drivers/gpio/gpio-regmap.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/gpio/gpio-regmap.c b/drivers/gpio/gpio-regmap.c
index 0a44deae3d01..6b520bd80834 100644
--- a/drivers/gpio/gpio-regmap.c
+++ b/drivers/gpio/gpio-regmap.c
@@ -429,6 +429,11 @@ struct gpio_regmap *gpio_regmap_register(const struct gpio_regmap_config *config
 
 err_remove_gpiochip:
 	gpiochip_remove(chip);
+
+#ifdef CONFIG_REGMAP_IRQ
+	if (gpio->irq_chip_data)
+		regmap_del_irq_chip(gpio->regmap_irq_line, gpio->irq_chip_data);
+#endif
 err_free_bitmap_output:
 	bitmap_free(gpio->fixed_direction_output);
 err_free_bitmap_dirmask:
@@ -445,12 +450,13 @@ EXPORT_SYMBOL_GPL(gpio_regmap_register);
  */
 void gpio_regmap_unregister(struct gpio_regmap *gpio)
 {
+	gpiochip_remove(&gpio->gpio_chip);
+
 #ifdef CONFIG_REGMAP_IRQ
 	if (gpio->irq_chip_data)
 		regmap_del_irq_chip(gpio->regmap_irq_line, gpio->irq_chip_data);
 #endif
 
-	gpiochip_remove(&gpio->gpio_chip);
 	bitmap_free(gpio->fixed_direction_output);
 	bitmap_free(gpio->fixed_direction_mask);
 	kfree(gpio);

-- 
2.34.1