[PATCH 4/4] gpio: altera: Handle errors from optional IRQ lookup

[phucduc.bui@gmail.com]

From: bui duc phuc <phucduc.bui@gmail.com>

platform_get_irq_optional() returns a positive IRQ number on success or
a negative error code on failure. For an optional IRQ, -ENXIO indicates
that no optional IRQ is available. Other errors, such as -EPROBE_DEFER
and -EINVAL, should be propagated so that the caller can handle them
appropriately.

Propagate negative errors other than -ENXIO.

Signed-off-by: bui duc phuc <phucduc.bui@gmail.com>
---
 drivers/gpio/gpio-altera.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpio/gpio-altera.c b/drivers/gpio/gpio-altera.c
index 532e3360b70e..d22f5be00745 100644
--- a/drivers/gpio/gpio-altera.c
+++ b/drivers/gpio/gpio-altera.c
@@ -220,8 +220,11 @@ static int altera_gpio_probe(struct platform_device *pdev)
 		return -ENOMEM;
 
 	mapped_irq = platform_get_irq_optional(pdev, 0);
-	if (mapped_irq < 0)
+	if (mapped_irq < 0) {
+		if (irq != -ENXIO)
+			return irq;
 		goto skip_irq;
+	}
 
 	if (device_property_read_u32(dev, "altr,interrupt-type", &reg)) {
 		dev_err(&pdev->dev,
-- 
2.43.0