[PATCH] iio: adc: exynos5_adc: fix compilation warnings

Naveen Krishna Chatradhi
2013-03-06T04:14:24Z

From: Naveen Krishna Ch <ch.naveen@samsung.com>

Fixes the compilation warnings and potential NULL pointer
dereferencing pointed out by "Dan Carpenter".

Signed-off-by: Naveen Krishna Ch <ch.naveen@samsung.com>
---
drivers/iio/adc/exynos_adc.c | 24 +++++++++++++++++-------
1 file changed, 17 insertions(+), 7 deletions(-)

diff --git a/drivers/iio/adc/exynos_adc.c b/drivers/iio/adc/exynos_adc.c
index ed6fdd7..67d07aa 100644
--- a/drivers/iio/adc/exynos_adc.c
+++ b/drivers/iio/adc/exynos_adc.c
@@ -92,7 +92,7 @@ struct exynos_adc {
struct completion completion;

u32 value;
- unsigned int version;
+ unsigned int version;
};

static const struct of_device_id exynos_adc_match[] = {
@@ -102,12 +102,15 @@ static const struct of_device_id exynos_adc_match[] = {
};
MODULE_DEVICE_TABLE(of, exynos_adc_match);

-static inline unsigned int exynos_adc_get_version(struct platform_device *pdev)
+static inline int exynos_adc_get_version(struct platform_device *pdev)
{
const struct of_device_id *match;

match = of_match_node(exynos_adc_match, pdev->dev.of_node);
- return (unsigned int)match->data;
+ if (!match)
+ return -ENODEV;
+
+ return (int)match->data;
}

static int exynos_read_raw(struct iio_dev *indio_dev,
@@ -117,7 +120,7 @@ static int exynos_read_raw(struct iio_dev *indio_dev,
long mask)
{
struct exynos_adc *info = iio_priv(indio_dev);
- unsigned long timeout;
+ int timeout;
u32 con1, con2;

if (mask != IIO_CHAN_INFO_RAW)
@@ -255,7 +258,7 @@ static int exynos_adc_probe(struct platform_device *pdev)
struct iio_dev *indio_dev = NULL;
struct resource *mem;
int ret = -ENODEV;
- int irq;
+ int irq, version;

if (!np)
return ret;
@@ -268,6 +271,15 @@ static int exynos_adc_probe(struct platform_device *pdev)

info = iio_priv(indio_dev);

+ version = exynos_adc_get_version(pdev);
+ if (version < 0) {
+ dev_err(&pdev->dev, "no matching of_node, err = %d\n", version);
+ ret = version;
+ goto err_iio;
+ }
+
+ info->version = version;
+
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);

info->regs = devm_request_and_ioremap(&pdev->dev, mem);
@@ -311,8 +323,6 @@ static int exynos_adc_probe(struct platform_device *pdev)
goto err_irq;
}

- info->version = exynos_adc_get_version(pdev);
-
platform_set_drvdata(pdev, indio_dev);

indio_dev->name = dev_name(&pdev->dev);
--
1.7.9.5