regulator: core: Add checking set_mode callback in regulator_set_optimum_mode

regulator_set_optimum_mode needs set_mode to properly work.
Add checking for set_mode callback in case it may be not implemented.

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 5c0c975e5ac2f5a0bb177abca8e39b4d06195130..2f0d557a910d4bdf92d687c074c23345633727ee 100644 (file)
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -2335,6 +2335,9 @@ int regulator_set_optimum_mode(struct regulator *regulator, int uA_load)
         */
        ret = -EINVAL;
 
+       if (!rdev->desc->ops->set_mode)
+               goto out;
+
        /* get output voltage */
        output_uV = _regulator_get_voltage(rdev);
        if (output_uV <= 0) {