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hwmon: (pwm-fan) split __set_pwm into locked/unlocked functions

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Regular calls to set_pwm don't hold the mutex, but the upcoming
update_enable support needs to call set_pwm with the mutex being held.
So provide the previous behavior in set_pwm (handling the lock), while
adding __set_pwm which assumes the lock being held.

Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20220914153137.613982-5-alexander.stein@ew.tq-group.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Alexander Stein 2022-09-14 17:31:36 +02:00 committed by Guenter Roeck
parent 9bf3aa6080
commit 9db6e7f500
1 changed files with 15 additions and 8 deletions
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23
drivers/hwmon/pwm-fan.c
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@ -152,14 +152,12 @@ static int __set_pwm(struct pwm_fan_ctx *ctx, unsigned long pwm)
unsigned long period;
int ret = 0;
mutex_lock(&ctx->lock);
if (pwm > 0) {
period = state->period;
state->duty_cycle = DIV_ROUND_UP(pwm * (period - 1), MAX_PWM);
ret = pwm_apply_state(ctx->pwm, state);
if (ret)
goto exit_set_pwm_err;
return ret;
ret = pwm_fan_power_on(ctx);
} else {
ret = pwm_fan_power_off(ctx);
@ -167,8 +165,17 @@ static int __set_pwm(struct pwm_fan_ctx *ctx, unsigned long pwm)
if (!ret)
ctx->pwm_value = pwm;
exit_set_pwm_err:
return ret;
}
static int set_pwm(struct pwm_fan_ctx *ctx, unsigned long pwm)
{
int ret;
mutex_lock(&ctx->lock);
ret = __set_pwm(ctx, pwm);
mutex_unlock(&ctx->lock);
return ret;
}
@ -192,7 +199,7 @@ static int pwm_fan_write(struct device *dev, enum hwmon_sensor_types type,
if (val < 0 || val > MAX_PWM)
return -EINVAL;
ret = __set_pwm(ctx, val);
ret = set_pwm(ctx, val);
if (ret)
return ret;
@ -280,7 +287,7 @@ pwm_fan_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state)
if (state == ctx->pwm_fan_state)
return 0;
ret = __set_pwm(ctx, ctx->pwm_fan_cooling_levels[state]);
ret = set_pwm(ctx, ctx->pwm_fan_cooling_levels[state]);
if (ret) {
dev_err(&cdev->device, "Cannot set pwm!\n");
return ret;
@ -398,7 +405,7 @@ static int pwm_fan_probe(struct platform_device *pdev)
pwm_init_state(ctx->pwm, &ctx->pwm_state);
/*
* __set_pwm assumes that MAX_PWM * (period - 1) fits into an unsigned
* set_pwm assumes that MAX_PWM * (period - 1) fits into an unsigned
* long. Check this here to prevent the fan running at a too low
* frequency.
*/
@ -408,7 +415,7 @@ static int pwm_fan_probe(struct platform_device *pdev)
}
/* Set duty cycle to maximum allowed and enable PWM output */
ret = __set_pwm(ctx, MAX_PWM);
ret = set_pwm(ctx, MAX_PWM);
if (ret) {
dev_err(dev, "Failed to configure PWM: %d\n", ret);
return ret;