diff options
| author | Vadim Pasternak <vadimp@nvidia.com> | 2023-02-12 17:57:30 +0300 |
|---|---|---|
| committer | Guenter Roeck <linux@roeck-us.net> | 2023-02-12 18:21:40 +0300 |
| commit | a1ffd3c46267ee5c807acd780e15df9bb692223f (patch) | |
| tree | c656a6c1313331b01670af51756b6f6b1414ce6c /drivers/hwmon/mlxreg-fan.c | |
| parent | 102be2c2420bd156a94ea509932c9eaef89b9424 (diff) | |
| download | linux-a1ffd3c46267ee5c807acd780e15df9bb692223f.tar.xz | |
hwmon: (mlxreg-fan) Return zero speed for broken fan
Currently for broken fan driver returns value calculated based on error
code (0xFF) in related fan speed register.
Thus, for such fan user gets fan{n}_fault to 1 and fan{n}_input with
misleading value.
Add check for fan fault prior return speed value and return zero if
fault is detected.
Fixes: 65afb4c8e7e4 ("hwmon: (mlxreg-fan) Add support for Mellanox FAN driver")
Signed-off-by: Vadim Pasternak <vadimp@nvidia.com>
Link: https://lore.kernel.org/r/20230212145730.24247-1-vadimp@nvidia.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Diffstat (limited to 'drivers/hwmon/mlxreg-fan.c')
| -rw-r--r-- | drivers/hwmon/mlxreg-fan.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/hwmon/mlxreg-fan.c b/drivers/hwmon/mlxreg-fan.c index b48bd7c961d6..96017cc8da7e 100644 --- a/drivers/hwmon/mlxreg-fan.c +++ b/drivers/hwmon/mlxreg-fan.c @@ -155,6 +155,12 @@ mlxreg_fan_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, if (err) return err; + if (MLXREG_FAN_GET_FAULT(regval, tacho->mask)) { + /* FAN is broken - return zero for FAN speed. */ + *val = 0; + return 0; + } + *val = MLXREG_FAN_GET_RPM(regval, fan->divider, fan->samples); break; |