diff options
| author | Armin Wolf <W_Armin@gmx.de> | 2021-12-11 16:54:22 +0100 |
|---|---|---|
| committer | Guenter Roeck <linux@roeck-us.net> | 2021-12-26 15:02:06 -0800 |
| commit | 87b93329fdd64bbb87db72d06ca084a06d183d6d (patch) | |
| tree | ac76aba824db853b9065e5e7b09de6d6a9ed01be /drivers/hwmon | |
| parent | 02405387746915b93b283c18780b6cef90394ea1 (diff) | |
| download | linux-87b93329fdd64bbb87db72d06ca084a06d183d6d.tar.gz linux-87b93329fdd64bbb87db72d06ca084a06d183d6d.tar.xz | |
hwmon: (dell-smm) Unify i8k_ioctl() and i8k_ioctl_unlocked()
The only purpose of i8k_ioctl() is to call i8k_ioctl_unlocked()
with i8k_mutex held. Judging from the hwmon code, this mutex
only needs to be held when setting the fan speed/mode, so
the operation of I8K_SET_FAN is guaranteed to be atomic.
Unify both functions and reduce the locking of i8k_mutex
to I8K_SET_FAN.
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/20211211155422.16830-3-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 | 28 |
1 files changed, 9 insertions, 19 deletions
diff --git a/drivers/hwmon/dell-smm-hwmon.c b/drivers/hwmon/dell-smm-hwmon.c index 186d40938036..d8c6e75bb374 100644 --- a/drivers/hwmon/dell-smm-hwmon.c +++ b/drivers/hwmon/dell-smm-hwmon.c @@ -449,12 +449,12 @@ static int i8k_get_power_status(void) * Procfs interface */ -static int -i8k_ioctl_unlocked(struct file *fp, struct dell_smm_data *data, unsigned int cmd, unsigned long arg) +static long i8k_ioctl(struct file *fp, unsigned int cmd, unsigned long arg) { - int val = 0; - int speed, err; + struct dell_smm_data *data = PDE_DATA(file_inode(fp)); int __user *argp = (int __user *)arg; + int speed, err; + int val = 0; if (!argp) return -EINVAL; @@ -516,11 +516,13 @@ 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; + mutex_lock(&data->i8k_mutex); err = i8k_set_fan(data, val, speed); if (err < 0) - return err; - - val = i8k_get_fan_status(data, val); + val = err; + else + val = i8k_get_fan_status(data, val); + mutex_unlock(&data->i8k_mutex); break; default: @@ -536,18 +538,6 @@ i8k_ioctl_unlocked(struct file *fp, struct dell_smm_data *data, unsigned int cmd return 0; } -static long i8k_ioctl(struct file *fp, unsigned int cmd, unsigned long arg) -{ - struct dell_smm_data *data = PDE_DATA(file_inode(fp)); - long ret; - - mutex_lock(&data->i8k_mutex); - ret = i8k_ioctl_unlocked(fp, data, cmd, arg); - mutex_unlock(&data->i8k_mutex); - - return ret; -} - /* * Print the information for /proc/i8k. */ |