[PATCH] input: misc: pwm-vibra: Prevent unbalanced regulator

[Paweł Chmiel]

From: Jonathan Bakker <xc-rac...@live.ca>

pwm_vibrator_stop disables the regulator, but it can be called from
multiple places, even when the regulator is already disabled. Fix this
by using regulator_is_enabled check when starting and stopping device.

Signed-off-by: Jonathan Bakker <xc-rac...@live.ca>
Signed-off-by: Paweł Chmiel <pawel.mikolaj.chm...@gmail.com>
---
 drivers/input/misc/pwm-vibra.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/drivers/input/misc/pwm-vibra.c b/drivers/input/misc/pwm-vibra.c
index 55da191ae550..66677ee770ca 100644
--- a/drivers/input/misc/pwm-vibra.c
+++ b/drivers/input/misc/pwm-vibra.c
@@ -42,10 +42,12 @@ static int pwm_vibrator_start(struct pwm_vibrator *vibrator)
        struct pwm_state state;
        int err;
 
-       err = regulator_enable(vibrator->vcc);
-       if (err) {
-               dev_err(pdev, "failed to enable regulator: %d", err);
-               return err;
+       if (!regulator_is_enabled(vibrator->vcc)) {
+               err = regulator_enable(vibrator->vcc);
+               if (err) {
+                       dev_err(pdev, "failed to enable regulator: %d", err);
+                       return err;
+               }
        }
 
        pwm_get_state(vibrator->pwm, &state);
@@ -76,7 +78,8 @@ static int pwm_vibrator_start(struct pwm_vibrator *vibrator)
 
 static void pwm_vibrator_stop(struct pwm_vibrator *vibrator)
 {
-       regulator_disable(vibrator->vcc);
+       if (regulator_is_enabled(vibrator->vcc))
+               regulator_disable(vibrator->vcc);
 
        if (vibrator->pwm_dir)
                pwm_disable(vibrator->pwm_dir);
-- 
2.17.1