From: Axel Lin <axel.lin@gmail.com>
Date: Mon, 16 Apr 2012 10:44:23 +0000 (+0800)
Subject: regulator: core: Add checking set_mode callback in regulator_set_optimum_mode
X-Git-Tag: v3.5-rc1~177^2~58^2~1
X-Git-Url: https://openfabrics.org/gitweb/?a=commitdiff_plain;h=854ccbaee7e48734936690a3fd4817c57e98aaad;p=~emulex%2Finfiniband.git

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 5c0c975e5ac..2f0d557a910 100644
--- 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) {