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authorDmitry Torokhov <dmitry.torokhov@gmail.com>2017-02-04 21:19:21 +0300
committerMark Brown <broonie@kernel.org>2017-02-05 19:36:40 +0300
commit163478dae0b6ce2437488e54012705b53ef43f3d (patch)
tree5211e13ebc37a571cc0f8631bbba99624a5c2653 /drivers/regulator
parentd1642ea717be09039114dad57a8ae08d77f17dfb (diff)
downloadlinux-163478dae0b6ce2437488e54012705b53ef43f3d.tar.xz
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>
Diffstat (limited to 'drivers/regulator')
-rw-r--r--drivers/regulator/core.c42
1 files changed, 23 insertions, 19 deletions
diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 867756651544..3e246c82939d 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -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);
/*