On 04/09/2024 06:48, Dmitry Torokhov wrote:
> Using guard notation makes the code more compact and error handling
> more robust by ensuring that mutexes are released in all code paths
> when control leaves critical section.
>
> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
> ---
> drivers/input/misc/max8997_haptic.c | 15 +++++----------
> 1 file changed, 5 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/input/misc/max8997_haptic.c b/drivers/input/misc/max8997_haptic.c
> index 11cac4b7dddc..2853455daef2 100644
> --- a/drivers/input/misc/max8997_haptic.c
> +++ b/drivers/input/misc/max8997_haptic.c
> @@ -153,19 +153,19 @@ static void max8997_haptic_enable(struct max8997_haptic *chip)
> {
> int error;
>
> - mutex_lock(&chip->mutex);
> + guard(mutex)(&chip->mutex);
>
> error = max8997_haptic_set_duty_cycle(chip);
> if (error) {
> dev_err(chip->dev, "set_pwm_cycle failed, error: %d\n", error);
> - goto out;
> + return;
> }
>
> if (!chip->enabled) {
> error = regulator_enable(chip->regulator);
> if (error) {
> dev_err(chip->dev, "Failed to enable regulator\n");
> - goto out;
> + return;
> }
> max8997_haptic_configure(chip);
> if (chip->mode == MAX8997_EXTERNAL_MODE) {
> @@ -173,19 +173,16 @@ static void max8997_haptic_enable(struct max8997_haptic *chip)
> if (error) {
> dev_err(chip->dev, "Failed to enable PWM\n");
> regulator_disable(chip->regulator);
> - goto out;
> + return;
> }
> }
> chip->enabled = true;
> }
> -
> -out:
> - mutex_unlock(&chip->mutex);
> }
>
> static void max8997_haptic_disable(struct max8997_haptic *chip)
> {
> - mutex_lock(&chip->mutex);
> + guard(mutex)(&chip->mutex);
>
> if (chip->enabled) {
> chip->enabled = false;
> @@ -194,8 +191,6 @@ static void max8997_haptic_disable(struct max8997_haptic *chip)
> pwm_disable(chip->pwm);
> regulator_disable(chip->regulator);
> }
> -
> - mutex_unlock(&chip->mutex);
> }
>
> static void max8997_haptic_play_effect_work(struct work_struct *work)
Reviewed-by: Javier Carrasco <javier.carrasco.cruz@gmail.com>