[PATCH v3] gpio: sifive: Add missing check for platform_get_irq

[Jiasheng Jiang]

Add the missing check for platform_get_irq() and return error code
if it fails.
The returned error code will be dealed with in
builtin_platform_driver(sifive_gpio_driver) and the driver will not
be registered.

Fixes: f52d6d8b43e5 ("gpio: sifive: To get gpio irq offset from device tree data")
Signed-off-by: Jiasheng Jiang <jiasheng at iscas.ac.cn>
---
Changelog:

v2 -> v3:

1. Check before assigning values.

v1 -> v2:

1. Return "girq->parents[0]" instead of "-ENODEV".
---
 drivers/gpio/gpio-sifive.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/gpio/gpio-sifive.c b/drivers/gpio/gpio-sifive.c
index 98939cd4a71e..745e5f67254e 100644
--- a/drivers/gpio/gpio-sifive.c
+++ b/drivers/gpio/gpio-sifive.c
@@ -221,8 +221,12 @@ static int sifive_gpio_probe(struct platform_device *pdev)
 		return -ENODEV;
 	}
 
-	for (i = 0; i < ngpio; i++)
-		chip->irq_number[i] = platform_get_irq(pdev, i);
+	for (i = 0; i < ngpio; i++) {
+		ret = platform_get_irq(pdev, i);
+		if (ret < 0)
+			return ret;
+		chip->irq_number[i] = ret;
+	}
 
 	ret = bgpio_init(&chip->gc, dev, 4,
 			 chip->base + SIFIVE_GPIO_INPUT_VAL,
-- 
2.25.1