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regulator: Fix useless O^2 complexity in suspend/resume 

regulator_pm_ops with regulator_suspend and regulator_resume functions are
assigned to every regulator device registered in the system, so there is no
need to iterate over all again in them. Replace class_for_each_device()
construction with direct operation on the rdev embedded in the given
regulator device. This saves a lots of useless operations in suspend and
resume paths.

Fixes: f7efad10b5c4: regulator: add PM suspend and resume hooks
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Marek Szyprowski 2018-09-03 16:49:36 +02:00 committed by Mark Brown
parent beb5a17fa3
commit cd7e36ab72
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GPG Key ID: 24D68B725D5487D0
1 changed files with 11 additions and 28 deletions
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39
drivers/regulator/core.c
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@ -4464,19 +4464,6 @@ void regulator_unregister(struct regulator_dev *rdev)
EXPORT_SYMBOL_GPL(regulator_unregister);
#ifdef CONFIG_SUSPEND
static int _regulator_suspend(struct device *dev, void *data)
{
struct regulator_dev *rdev = dev_to_rdev(dev);
suspend_state_t *state = data;
int ret;
regulator_lock(rdev);
ret = suspend_set_state(rdev, *state);
regulator_unlock(rdev);
return ret;
}
/**
* regulator_suspend - prepare regulators for system wide suspend
* @state: system suspend state
@ -4485,20 +4472,25 @@ static int _regulator_suspend(struct device *dev, void *data)
*/
static int regulator_suspend(struct device *dev)
{
struct regulator_dev *rdev = dev_to_rdev(dev);
suspend_state_t state = pm_suspend_target_state;
int ret;
return class_for_each_device(&regulator_class, NULL, &state,
_regulator_suspend);
regulator_lock(rdev);
ret = suspend_set_state(rdev, state);
regulator_unlock(rdev);
return ret;
}
static int _regulator_resume(struct device *dev, void *data)
static int regulator_resume(struct device *dev)
{
int ret = 0;
suspend_state_t state = pm_suspend_target_state;
struct regulator_dev *rdev = dev_to_rdev(dev);
suspend_state_t *state = data;
struct regulator_state *rstate;
int ret = 0;
rstate = regulator_get_suspend_state(rdev, *state);
rstate = regulator_get_suspend_state(rdev, state);
if (rstate == NULL)
return 0;
@ -4513,15 +4505,6 @@ static int _regulator_resume(struct device *dev, void *data)
return ret;
}
static int regulator_resume(struct device *dev)
{
suspend_state_t state = pm_suspend_target_state;
return class_for_each_device(&regulator_class, NULL, &state,
_regulator_resume);
}
#else /* !CONFIG_SUSPEND */
#define regulator_suspend NULL