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authorDavid Brownell <dbrownell@users.sourceforge.net>2009-03-11 16:43:34 -0800
committerLiam Girdwood <lrg@slimlogic.co.uk>2009-03-31 09:56:28 +0100
commitcd94b5053081963614f6ad77b9b66a7968056c84 (patch)
tree42e2ae16a14457a4e755f63fd5ff95511220f9c8 /drivers/regulator
parent1dc60343f874ce4bfbbc2c3d2f7865fc897df479 (diff)
downloadlinux-cd94b5053081963614f6ad77b9b66a7968056c84.tar.bz2
regulator: refcount fixes
Fix some refcounting issues in the regulator framework, supporting regulator_disable() for regulators that were enabled at boot time via machine constraints: - Update those regulators' usecounts after enabling, so they can cleanly be disabled at that level. - Remove the problematic per-consumer usecount, so there's only one level of enable/disable. Buggy consumers could notice different bug symptoms. The main example would be refcounting bugs; also, any (out-of-tree) users of the experimental regulator_set_optimum_mode() stuff which don't call it when they're done using a regulator. This is a net minor codeshrink. Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
Diffstat (limited to 'drivers/regulator')
-rw-r--r--drivers/regulator/core.c30
1 files changed, 8 insertions, 22 deletions
diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 019a8a42ac18..944887578d66 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -52,7 +52,6 @@ struct regulator {
int uA_load;
int min_uV;
int max_uV;
- int enabled; /* count of client enables */
char *supply_name;
struct device_attribute dev_attr;
struct regulator_dev *rdev;
@@ -815,6 +814,7 @@ static int set_machine_constraints(struct regulator_dev *rdev,
rdev->constraints = NULL;
goto out;
}
+ rdev->use_count = 1;
}
print_constraints(rdev);
@@ -1068,10 +1068,6 @@ void regulator_put(struct regulator *regulator)
mutex_lock(&regulator_list_mutex);
rdev = regulator->rdev;
- if (WARN(regulator->enabled, "Releasing supply %s while enabled\n",
- regulator->supply_name))
- _regulator_disable(rdev);
-
/* remove any sysfs entries */
if (regulator->dev) {
sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name);
@@ -1146,12 +1142,7 @@ int regulator_enable(struct regulator *regulator)
int ret = 0;
mutex_lock(&rdev->mutex);
- if (regulator->enabled == 0)
- ret = _regulator_enable(rdev);
- else if (regulator->enabled < 0)
- ret = -EIO;
- if (ret == 0)
- regulator->enabled++;
+ ret = _regulator_enable(rdev);
mutex_unlock(&rdev->mutex);
return ret;
}
@@ -1162,6 +1153,11 @@ static int _regulator_disable(struct regulator_dev *rdev)
{
int ret = 0;
+ if (WARN(rdev->use_count <= 0,
+ "unbalanced disables for %s\n",
+ rdev->desc->name))
+ return -EIO;
+
/* are we the last user and permitted to disable ? */
if (rdev->use_count == 1 && !rdev->constraints->always_on) {
@@ -1210,16 +1206,7 @@ int regulator_disable(struct regulator *regulator)
int ret = 0;
mutex_lock(&rdev->mutex);
- if (regulator->enabled == 1) {
- ret = _regulator_disable(rdev);
- if (ret == 0)
- regulator->uA_load = 0;
- } else if (WARN(regulator->enabled <= 0,
- "unbalanced disables for supply %s\n",
- regulator->supply_name))
- ret = -EIO;
- if (ret == 0)
- regulator->enabled--;
+ ret = _regulator_disable(rdev);
mutex_unlock(&rdev->mutex);
return ret;
}
@@ -1266,7 +1253,6 @@ int regulator_force_disable(struct regulator *regulator)
int ret;
mutex_lock(&regulator->rdev->mutex);
- regulator->enabled = 0;
regulator->uA_load = 0;
ret = _regulator_force_disable(regulator->rdev);
mutex_unlock(&regulator->rdev->mutex);