[PATCH 1/1] regulator: Only enable disabled regulators on resume

[Javier Martinez Canillas <javier.martinez@collabora.co.uk>]

After leaving from system wide suspend state, regulator_suspend_finish()
turn on regulators that may be turned off by regulator_suspend_prepare()
but it tries to enable all regulators that have an enable count > 0 or
that were marked as "always-on" regardless if those were disabled or not.

Trying to enable an already enabled regulator may cause issues so is
better to skip enabling regulators that were not disabled before suspend.

Signed-off-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
---
 drivers/regulator/core.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index f2452148c8da..8551400d57e4 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -3816,9 +3816,11 @@ int regulator_suspend_finish(void)
 	list_for_each_entry(rdev, &regulator_list, list) {
 		mutex_lock(&rdev->mutex);
 		if (rdev->use_count > 0  || rdev->constraints->always_on) {
-			error = _regulator_do_enable(rdev);
-			if (error)
-				ret = error;
+			if (!_regulator_is_enabled(rdev)) {
+				error = _regulator_do_enable(rdev);
+				if (error)
+					ret = error;
+			}
 		} else {
 			if (!have_full_constraints())
 				goto unlock;
-- 
2.1.3