iio: adc: meson-saradc: fix potential crash in meson_sar_adc_clear_fifo

meson_sar_adc_clear_fifo passes a 0 as value-pointer to regmap_read().
In case of the meson-saradc driver this ends up in regmap_mmio_read(),
where the value-pointer is de-referenced unconditionally to assign the
value which was read.
Fix this by passing an actual pointer, even though all we want to do is
to discard the value.

As a side-effect this fixes a sparse warning ("Using plain integer as
NULL pointer") as reported by Paolo Cretaro.

Fixes: 3adbf3427330 ("iio: adc: add a driver for the SAR ADC found in Amlogic Meson SoCs")
Reported-by: Paolo Cretaro <paolocretaro@gmail.com>
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/iio/adc/meson_saradc.c b/drivers/iio/adc/meson_saradc.c
index dd4190b50df6..6066bbfc42fe 100644
--- a/drivers/iio/adc/meson_saradc.c
+++ b/drivers/iio/adc/meson_saradc.c
@@ -468,13 +468,13 @@ static void meson_sar_adc_unlock(struct iio_dev *indio_dev)
 static void meson_sar_adc_clear_fifo(struct iio_dev *indio_dev)
 {
         struct meson_sar_adc_priv *priv = iio_priv(indio_dev);
-        int count;
+        unsigned int count, tmp;
 
         for (count = 0; count < MESON_SAR_ADC_MAX_FIFO_SIZE; count++) {
                 if (!meson_sar_adc_get_fifo_count(indio_dev))
                         break;
 
-                regmap_read(priv->regmap, MESON_SAR_ADC_FIFO_RD, 0);
+                regmap_read(priv->regmap, MESON_SAR_ADC_FIFO_RD, &tmp);
         }
 }