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| author | Armin Wolf <W_Armin@gmx.de> | 2021-10-21 21:05:31 +0200 |
|---|---|---|
| committer | Guenter Roeck <linux@roeck-us.net> | 2021-10-21 22:14:27 +0200 |
| commit | c0d79987a0d82671bff374c07f2201f9bdf4aaa2 (patch) | |
| tree | 0d8dc6f7d726d96fe901c12f040d6b9f7f1504cc /drivers/hwmon | |
| parent | hwmon: (dell-smm) Add comment explaining usage of i8k_config_data[] (diff) | |
| download | linux-c0d79987a0d82671bff374c07f2201f9bdf4aaa2.tar.xz linux-c0d79987a0d82671bff374c07f2201f9bdf4aaa2.zip | |
hwmon: (dell-smm) Speed up setting of fan speed
When setting the fan speed, i8k_set_fan() calls i8k_get_fan_status(),
causing an unnecessary SMM call since from the two users of this
function, only i8k_ioctl_unlocked() needs to know the new fan status
while dell_smm_write() ignores the new fan status.
Since SMM calls can be very slow while also making error reporting
difficult for dell_smm_write(), remove the function call from
i8k_set_fan() and call it separately in i8k_ioctl_unlocked().
Tested on a Dell Inspiron 3505.
Signed-off-by: Armin Wolf <W_Armin@gmx.de>
Reviewed-by: Pali Rohár <pali@kernel.org>
Link: https://lore.kernel.org/r/20211021190531.17379-6-W_Armin@gmx.de
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Diffstat (limited to 'drivers/hwmon')
| -rw-r--r-- | drivers/hwmon/dell-smm-hwmon.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/drivers/hwmon/dell-smm-hwmon.c b/drivers/hwmon/dell-smm-hwmon.c index 0e1bc3a2dd12..eaace478f508 100644 --- a/drivers/hwmon/dell-smm-hwmon.c +++ b/drivers/hwmon/dell-smm-hwmon.c @@ -327,7 +327,7 @@ static int i8k_enable_fan_auto_mode(const struct dell_smm_data *data, bool enabl } /* - * Set the fan speed (off, low, high). Returns the new fan status. + * Set the fan speed (off, low, high, ...). */ static int i8k_set_fan(const struct dell_smm_data *data, int fan, int speed) { @@ -339,7 +339,7 @@ static int i8k_set_fan(const struct dell_smm_data *data, int fan, int speed) speed = (speed < 0) ? 0 : ((speed > data->i8k_fan_max) ? data->i8k_fan_max : speed); regs.ebx = (fan & 0xff) | (speed << 8); - return i8k_smm(®s) ? : i8k_get_fan_status(data, fan); + return i8k_smm(®s); } static int __init i8k_get_temp_type(int sensor) @@ -453,7 +453,7 @@ static int i8k_ioctl_unlocked(struct file *fp, struct dell_smm_data *data, unsigned int cmd, unsigned long arg) { int val = 0; - int speed; + int speed, err; unsigned char buff[16]; int __user *argp = (int __user *)arg; @@ -513,7 +513,11 @@ i8k_ioctl_unlocked(struct file *fp, struct dell_smm_data *data, unsigned int cmd if (copy_from_user(&speed, argp + 1, sizeof(int))) return -EFAULT; - val = i8k_set_fan(data, val, speed); + err = i8k_set_fan(data, val, speed); + if (err < 0) + return err; + + val = i8k_get_fan_status(data, val); break; default: |