Adding upstream version 6.9.7.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 18 insertions, 1 deletions

diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c
index 7f140df40f..c1e190d3ea 100644
--- a/drivers/gpio/gpiolib-acpi.c
+++ b/drivers/gpio/gpiolib-acpi.c
@@ -128,7 +128,24 @@ static bool acpi_gpio_deferred_req_irqs_done;
 
 static int acpi_gpiochip_find(struct gpio_chip *gc, const void *data)
 {
-	return device_match_acpi_handle(&gc->gpiodev->dev, data);
+	/* First check the actual GPIO device */
+	if (device_match_acpi_handle(&gc->gpiodev->dev, data))
+		return true;
+
+	/*
+	 * When the ACPI device is artificially split to the banks of GPIOs,
+	 * where each of them is represented by a separate GPIO device,
+	 * the firmware node of the physical device may not be shared among
+	 * the banks as they may require different values for the same property,
+	 * e.g., number of GPIOs in a certain bank. In such case the ACPI handle
+	 * of a GPIO device is NULL and can not be used. Hence we have to check
+	 * the parent device to be sure that there is no match before bailing
+	 * out.
+	 */
+	if (gc->parent)
+		return device_match_acpi_handle(gc->parent, data);
+
+	return false;
 }
 
 /**