hwmon/smsc47b397: Don't report missing fans as spinning at 82 RPM
Also protects ourselves against a possible division by zero.
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Mark M. Hoffman <mhoffman@lightlink.com>
diff --git a/drivers/hwmon/smsc47b397.c b/drivers/hwmon/smsc47b397.c
index 3b65b0e..45266b3 100644
--- a/drivers/hwmon/smsc47b397.c
+++ b/drivers/hwmon/smsc47b397.c
@@ -174,6 +174,8 @@
REG: count of 90kHz pulses / revolution */
static int fan_from_reg(u16 reg)
{
+ if (reg == 0 || reg == 0xffff)
+ return 0;
return 90000 * 60 / reg;
}