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regulator: core: have regulator_dev_lookup() return ERR_PTR-encoded errors 

Instead of returning both regulator_dev structure as return value and
auxiliary error code in 'ret' argument, let's switch to using ERR_PTR
encoded values. This makes it more obvious what is going on at call sites.

Also, let's not unlock the mutex in the middle of a loop, but rather break
out and have single unlock path.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Dmitry Torokhov 2017-02-04 10:19:21 -08:00 committed by Mark Brown
parent d1642ea717
commit 163478dae0
1 changed files with 23 additions and 19 deletions
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42
drivers/regulator/core.c
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@ -1455,12 +1455,14 @@ static struct regulator_dev *regulator_lookup_by_name(const char *name)
* lookup could succeed in the future.
*
* If successful, returns a struct regulator_dev that corresponds to the name
* @supply and with the embedded struct device refcount incremented by one,
* or NULL on failure. The refcount must be dropped by calling put_device().
* @supply and with the embedded struct device refcount incremented by one.
* The refcount must be dropped by calling put_device().
* On failure one of the following ERR-PTR-encoded values is returned:
* -ENODEV if lookup fails permanently, -EPROBE_DEFER if lookup could succeed
* in the future.
*/
static struct regulator_dev *regulator_dev_lookup(struct device *dev,
const char *supply,
int *ret)
const char *supply)
{
struct regulator_dev *r;
struct device_node *node;
@ -1476,16 +1478,12 @@ static struct regulator_dev *regulator_dev_lookup(struct device *dev,
r = of_find_regulator_by_node(node);
if (r)
return r;
*ret = -EPROBE_DEFER;
return NULL;
} else {
/*
* If we couldn't even get the node then it's
* not just that the device didn't register
* yet, there's no node and we'll never
* succeed.
* We have a node, but there is no device.
* assume it has not registered yet.
*/
*ret = -ENODEV;
return ERR_PTR(-EPROBE_DEFER);
}
}
@ -1506,13 +1504,16 @@ static struct regulator_dev *regulator_dev_lookup(struct device *dev,
if (strcmp(map->supply, supply) == 0 &&
get_device(&map->regulator->dev)) {
mutex_unlock(&regulator_list_mutex);
return map->regulator;
r = map->regulator;
break;
}
}
mutex_unlock(&regulator_list_mutex);
return NULL;
if (r)
return r;
return ERR_PTR(-ENODEV);
}
static int regulator_resolve_supply(struct regulator_dev *rdev)
@ -1529,8 +1530,10 @@ static int regulator_resolve_supply(struct regulator_dev *rdev)
if (rdev->supply)
return 0;
r = regulator_dev_lookup(dev, rdev->supply_name, &ret);
if (!r) {
r = regulator_dev_lookup(dev, rdev->supply_name);
if (IS_ERR(r)) {
ret = PTR_ERR(r);
if (ret == -ENODEV) {
/*
* No supply was specified for this regulator and
@ -1601,10 +1604,11 @@ struct regulator *_regulator_get(struct device *dev, const char *id,
if (dev)
devname = dev_name(dev);
rdev = regulator_dev_lookup(dev, id, &ret);
if (rdev)
rdev = regulator_dev_lookup(dev, id);
if (!IS_ERR(rdev))
goto found;
ret = PTR_ERR(rdev);
regulator = ERR_PTR(ret);
/*