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tegra: gpio: fix null label regression 

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:

2fccd2d96b
tegra: Convert tegra GPIO driver to use driver model

Signed-off-by: Marcel Ziswiler <marcel@ziswiler.com>
Acked-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Warren <twarren@nvidia.com>
This commit is contained in:
Marcel Ziswiler 2014-10-10 16:56:50 +02:00 committed by Tom Warren
parent 09fb73611f
commit 1c1786d4c5
1 changed files with 3 additions and 0 deletions
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3
drivers/gpio/tegra_gpio.c
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@ -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;