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-rw-r--r--drivers/hwmon/smsc47b397.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/hwmon/smsc47b397.c b/drivers/hwmon/smsc47b397.c
index 3b65b0e61c4..45266b30ce1 100644
--- a/drivers/hwmon/smsc47b397.c
+++ b/drivers/hwmon/smsc47b397.c
@@ -174,6 +174,8 @@ static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 3);
REG: count of 90kHz pulses / revolution */
static int fan_from_reg(u16 reg)
{
+ if (reg == 0 || reg == 0xffff)
+ return 0;
return 90000 * 60 / reg;
}