[PATCH v2 11/16] hwmon: (mr75203) add protection for negative voltage value

Eliav Farber
2022-08-17T05:45:05Z

This change makes sure the returned voltage vlaue is 0 or positive.

Signed-off-by: Eliav Farber <farbere@amazon.com>
---
drivers/hwmon/mr75203.c | 7 +++++++
1 file changed, 7 insertions(+)

diff --git a/drivers/hwmon/mr75203.c b/drivers/hwmon/mr75203.c
index 24a00339cfd8..e3191f590167 100644
--- a/drivers/hwmon/mr75203.c
+++ b/drivers/hwmon/mr75203.c
@@ -218,6 +218,13 @@ static int pvt_read_in(struct device *dev, u32 attr, int channel, long *val)
return ret;

n &= SAMPLE_DATA_MSK;
+
+ /* Voltage can't be negative */
+ if (PVT_N_CONST * n < PVT_R_CONST) {
+ *val = 0;
+ return 0;
+ }
+
/* Convert the N bitstream count into voltage */
*val = pvt->vd[channel].pre_scaler;
*val *= (PVT_N_CONST * n - PVT_R_CONST);
--
2.37.1