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authorJavier Martinez Canillas <javier.martinez@collabora.co.uk>2015-03-02 23:40:39 +0300
committerMark Brown <broonie@kernel.org>2015-03-08 22:40:16 +0300
commit0548bf4f5ad6fc3bd93c4940fa48078b34609682 (patch)
treed35bb0b948c53be97a96a776acde955e0d24363c /drivers/regulator
parentc517d838eb7d07bbe9507871fab3931deccff539 (diff)
downloadlinux-0548bf4f5ad6fc3bd93c4940fa48078b34609682.tar.xz
regulator: Only enable disabled regulators on resume
The _regulator_do_enable() call ought to be a no-op when called on an already-enabled regulator. However, as an optimization _regulator_enable() doesn't call _regulator_do_enable() on an already enabled regulator. That means we never test the case of calling _regulator_do_enable() during normal usage and there may be hidden bugs or warnings. We have seen warnings issued by the tps65090 driver and bugs when using the GPIO enable pin. Let's match the same optimization that _regulator_enable() in regulator_suspend_finish(). That may speed up suspend/resume and also avoids exposing hidden bugs. [Use much clearer commit message from Doug Anderson] Signed-off-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk> Signed-off-by: Mark Brown <broonie@kernel.org> Cc: stable@vger.kernel.org
Diffstat (limited to 'drivers/regulator')
-rw-r--r--drivers/regulator/core.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index b899947d839d..0e271e57504a 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -3807,9 +3807,11 @@ 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;