Input: max8997_haptic - add error handling for regulator and pwm

Let's start checking return value of regulator_enable and pwm_enable to
avoid errors. Fixes the following warning:

drivers/input/misc/max8997_haptic.c:185:19: warning: ignoring return value of ‘regulator_enable’, declared with attribute warn_unused_result [-Wunused-result]

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

1 files changed, 14 insertions, 4 deletions

diff --git a/drivers/input/misc/max8997_haptic.c b/drivers/input/misc/max8997_haptic.c
index 1fea5484941f..a363ebbd9cc0 100644
--- a/drivers/input/misc/max8997_haptic.c
+++ b/drivers/input/misc/max8997_haptic.c
@@ -181,11 +181,21 @@ static void max8997_haptic_enable(struct max8997_haptic *chip)
         }
 
         if (!chip->enabled) {
-                chip->enabled = true;
-                regulator_enable(chip->regulator);
+                error = regulator_enable(chip->regulator);
+                if (error) {
+                        dev_err(chip->dev, "Failed to enable regulator\n");
+                        goto out;
+                }
                 max8997_haptic_configure(chip);
-                if (chip->mode == MAX8997_EXTERNAL_MODE)
-                        pwm_enable(chip->pwm);
+                if (chip->mode == MAX8997_EXTERNAL_MODE) {
+                        error = pwm_enable(chip->pwm);
+                        if (error) {
+                                dev_err(chip->dev, "Failed to enable PWM\n");
+                                regulator_disable(chip->regulator);
+                                goto out;
+                        }
+                }
+                chip->enabled = true;
         }
 
 out: