From acaf6ffefdf65188071f88664435b86651d70e7c Mon Sep 17 00:00:00 2001 From: Bengt Jonsson Date: Wed, 10 Nov 2010 11:06:22 +0100 Subject: regulator: enable supply regulator only when use count is zero Supply regulators are disabled only when the last reference count is removed on the child regulator (the use count goes from 1 to 0). This patch changes the behaviour of enable so the supply regulator is enabled only when the use count of the child regulator goes from 0 to 1. Signed-off-by: Bengt Jonsson Acked-by: Linus Walleij Acked-by: Mark Brown Signed-off-by: Liam Girdwood --- drivers/regulator/core.c | 20 +++++++++++--------- 1 file changed, 11 insertions(+), 9 deletions(-) (limited to 'drivers/regulator') diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c index 8a5d0ae191b3..a48cf582dcd0 100644 --- a/drivers/regulator/core.c +++ b/drivers/regulator/core.c @@ -1273,15 +1273,17 @@ static int _regulator_enable(struct regulator_dev *rdev) { int ret, delay; - /* do we need to enable the supply regulator first */ - if (rdev->supply) { - mutex_lock(&rdev->supply->mutex); - ret = _regulator_enable(rdev->supply); - mutex_unlock(&rdev->supply->mutex); - if (ret < 0) { - printk(KERN_ERR "%s: failed to enable %s: %d\n", - __func__, rdev_get_name(rdev), ret); - return ret; + if (rdev->use_count == 0) { + /* do we need to enable the supply regulator first */ + if (rdev->supply) { + mutex_lock(&rdev->supply->mutex); + ret = _regulator_enable(rdev->supply); + mutex_unlock(&rdev->supply->mutex); + if (ret < 0) { + printk(KERN_ERR "%s: failed to enable %s: %d\n", + __func__, rdev_get_name(rdev), ret); + return ret; + } } } -- cgit v1.2.3