tmakin/tegra-linux-noble
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pwm: Set enable state properly on failed call to enable

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The pwm_enable() function didn't clear the enabled bit if a call to the
driver's ->enable() callback returned an error. The result was that the
state of the PWM core was wrong. Clearing the bit when enable returns
an error ensures the state is properly set.

Tested-by: Jonathan Richardson <jonathar@broadcom.com>
Reviewed-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Jonathan Richardson <jonathar@broadcom.com>
[thierry.reding@gmail.com: add missing kerneldoc for the lock]
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
This commit is contained in:
Jonathan Richardson
2015-10-16 17:40:58 -07:00
committed by Thierry Reding
parent f080be27d7
commit d1cd214277
2 changed files with 29 additions and 7 deletions
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33
drivers/pwm/core.c
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@@ -269,6 +269,7 @@ int pwmchip_add_with_polarity(struct pwm_chip *chip,
pwm->pwm = chip->base + i;
pwm->hwpwm = i;
pwm->polarity = polarity;
mutex_init(&pwm->lock);
radix_tree_insert(&pwm_tree, pwm->pwm, pwm);
}
@@ -473,16 +474,22 @@ int pwm_set_polarity(struct pwm_device *pwm, enum pwm_polarity polarity)
if (!pwm->chip->ops->set_polarity)
return -ENOSYS;
if (pwm_is_enabled(pwm))
return -EBUSY;
mutex_lock(&pwm->lock);
if (pwm_is_enabled(pwm)) {
err = -EBUSY;
goto unlock;
}
err = pwm->chip->ops->set_polarity(pwm->chip, pwm, polarity);
if (err)
return err;
goto unlock;
pwm->polarity = polarity;
return 0;
unlock:
mutex_unlock(&pwm->lock);
return err;
}
EXPORT_SYMBOL_GPL(pwm_set_polarity);
@@ -494,10 +501,22 @@ EXPORT_SYMBOL_GPL(pwm_set_polarity);
*/
int pwm_enable(struct pwm_device *pwm)
{
if (pwm && !test_and_set_bit(PWMF_ENABLED, &pwm->flags))
return pwm->chip->ops->enable(pwm->chip, pwm);
int err = 0;
return pwm ? 0 : -EINVAL;
if (!pwm)
return -EINVAL;
mutex_lock(&pwm->lock);
if (!test_and_set_bit(PWMF_ENABLED, &pwm->flags)) {
err = pwm->chip->ops->enable(pwm->chip, pwm);
if (err)
clear_bit(PWMF_ENABLED, &pwm->flags);
}
mutex_unlock(&pwm->lock);
return err;
}
EXPORT_SYMBOL_GPL(pwm_enable);