[U-Boot] [PATCH] tegra: gpio: fix null label regression

[Marcel Ziswiler]

Fix Tegra GPIO driver to not crash resp. misbehave upon requesting
GPIOs with an empty aka NULL label. As the driver uses exclusively the
label to check for reservation status actually supplying one is
mandatory!

This fixes a regression introduced by commit:

2fccd2d96badcdf6165658a99771a4c475586279
tegra: Convert tegra GPIO driver to use driver model

Signed-off-by: Marcel Ziswiler <marcel at ziswiler.com>
---
 drivers/gpio/tegra_gpio.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpio/tegra_gpio.c b/drivers/gpio/tegra_gpio.c
index 1cc4abb..70663fc 100644
--- a/drivers/gpio/tegra_gpio.c
+++ b/drivers/gpio/tegra_gpio.c
@@ -171,6 +171,9 @@ static int tegra_gpio_request(struct udevice *dev, unsigned offset,
 {
 	struct tegra_port_info *state = dev_get_priv(dev);
 
+	if (!label)
+		return -EINVAL;
+
 	if (*state->label[offset])
 		return -EBUSY;
 
-- 
1.9.3