diff options
| author | Vadim Pasternak <vadimp@nvidia.com> | 2023-02-12 17:57:30 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-03-10 11:33:22 +0300 |
| commit | 007374a1b4fb7cecca92532afbb8f744ad3c5b82 (patch) | |
| tree | ced624d4ce66febe7108f2d28173cf31e45e8a4b | |
| parent | e4aac4fb1dfeefa742c8151dcb274e09b1cbdf81 (diff) | |
| download | linux-007374a1b4fb7cecca92532afbb8f744ad3c5b82.tar.xz | |
hwmon: (mlxreg-fan) Return zero speed for broken fan
[ Upstream commit a1ffd3c46267ee5c807acd780e15df9bb692223f ]
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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -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; |