staging: iio: adc: ad7280a: Avoid precedence issues in macro

Enclosing parameter with parenthesis due to avoid
possible precedence issue.

Signed-off-by: Cristian Sicilia <sicilia.cristian@gmail.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/staging/iio/adc/ad7280a.c b/drivers/staging/iio/adc/ad7280a.c
index d9df126..4199a4f 100644 (file)
--- a/drivers/staging/iio/adc/ad7280a.c
+++ b/drivers/staging/iio/adc/ad7280a.c
@@ -97,9 +97,10 @@
 #define AD7280A_NUM_CH                 (AD7280A_AUX_ADC_6 - \
                                        AD7280A_CELL_VOLTAGE_1 + 1)
 
-#define AD7280A_CALC_VOLTAGE_CHAN_NUM(d, c) ((d * AD7280A_CELLS_PER_DEV) + c)
-#define AD7280A_CALC_TEMP_CHAN_NUM(d, c)    ((d * AD7280A_CELLS_PER_DEV) + \
-                                            c - AD7280A_CELLS_PER_DEV)
+#define AD7280A_CALC_VOLTAGE_CHAN_NUM(d, c) (((d) * AD7280A_CELLS_PER_DEV) + \
+                                            (c))
+#define AD7280A_CALC_TEMP_CHAN_NUM(d, c)    (((d) * AD7280A_CELLS_PER_DEV) + \
+                                            (c) - AD7280A_CELLS_PER_DEV)
 
 #define AD7280A_DEVADDR_MASTER         0
 #define AD7280A_DEVADDR_ALL            0x1F