diff options
Diffstat (limited to 'drivers/pwm')
| -rw-r--r-- | drivers/pwm/core.c | 14 |
1 files changed, 8 insertions, 6 deletions
diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c index dedf38a81bf9..57b8cedfec3f 100644 --- a/drivers/pwm/core.c +++ b/drivers/pwm/core.c @@ -526,10 +526,8 @@ static int pwm_apply_legacy(struct pwm_chip *chip, struct pwm_device *pwm, const struct pwm_state *state) { int err; + struct pwm_state initial_state = pwm->state; - /* - * FIXME: restore the initial state in case of error. - */ if (state->polarity != pwm->state.polarity) { if (!chip->ops->set_polarity) return -EINVAL; @@ -550,7 +548,7 @@ static int pwm_apply_legacy(struct pwm_chip *chip, struct pwm_device *pwm, err = chip->ops->set_polarity(chip, pwm, state->polarity); if (err) - return err; + goto rollback; pwm->state.polarity = state->polarity; } @@ -573,7 +571,7 @@ static int pwm_apply_legacy(struct pwm_chip *chip, struct pwm_device *pwm, state->duty_cycle, state->period); if (err) - return err; + goto rollback; pwm->state.period = state->period; pwm->state.duty_cycle = state->duty_cycle; @@ -581,10 +579,14 @@ static int pwm_apply_legacy(struct pwm_chip *chip, struct pwm_device *pwm, if (!pwm->state.enabled) { err = chip->ops->enable(chip, pwm); if (err) - return err; + goto rollback; } return 0; + +rollback: + pwm->state = initial_state; + return err; } /** |