diff --git a/drivers/regulator/bq24022.c b/drivers/regulator/bq24022.c
index 7ecb820ceebc5b21568ef80c07b019041df7a2d6..d08cd9b66c6dde8777af20b39b0dff428193bf2d 100644
--- a/drivers/regulator/bq24022.c
+++ b/drivers/regulator/bq24022.c
@@ -61,8 +61,7 @@ static int bq24022_disable(struct regulator_dev *rdev)
 
 static int bq24022_is_enabled(struct regulator_dev *rdev)
 {
-	struct platform_device *pdev = rdev_get_drvdata(rdev);
-	struct bq24022_mach_info *pdata = pdev->dev.platform_data;
+	struct bq24022_mach_info *pdata = rdev_get_drvdata(rdev);
 
 	return !gpio_get_value(pdata->gpio_nce);
 }
diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 01f7702a805dc462f29d59110c1c76bb9985c480..98c3a74e994943f1041818896ae23961781ed041 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -540,8 +540,8 @@ static void drms_uA_update(struct regulator_dev *rdev)
 
 	err = regulator_check_drms(rdev);
 	if (err < 0 || !rdev->desc->ops->get_optimum_mode ||
-	    !rdev->desc->ops->get_voltage || !rdev->desc->ops->set_mode);
-	return;
+	    !rdev->desc->ops->get_voltage || !rdev->desc->ops->set_mode)
+		return;
 
 	/* get output voltage */
 	output_uV = rdev->desc->ops->get_voltage(rdev);
@@ -703,10 +703,13 @@ static int set_machine_constraints(struct regulator_dev *rdev,
 		int	cmin = constraints->min_uV;
 		int	cmax = constraints->max_uV;
 
-		/* it's safe to autoconfigure fixed-voltage supplies */
+		/* it's safe to autoconfigure fixed-voltage supplies
+		   and the constraints are used by list_voltage. */
 		if (count == 1 && !cmin) {
-			cmin = INT_MIN;
+			cmin = 1;
 			cmax = INT_MAX;
+			constraints->min_uV = cmin;
+			constraints->max_uV = cmax;
 		}
 
 		/* voltage constraints are optional */
@@ -2001,8 +2004,8 @@ struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc,
 	if (regulator_desc->name == NULL || regulator_desc->ops == NULL)
 		return ERR_PTR(-EINVAL);
 
-	if (!regulator_desc->type == REGULATOR_VOLTAGE &&
-	    !regulator_desc->type == REGULATOR_CURRENT)
+	if (regulator_desc->type != REGULATOR_VOLTAGE &&
+	    regulator_desc->type != REGULATOR_CURRENT)
 		return ERR_PTR(-EINVAL);
 
 	if (!init_data)
@@ -2080,6 +2083,10 @@ struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc,
 
 scrub:
 	device_unregister(&rdev->dev);
+	/* device core frees rdev */
+	rdev = ERR_PTR(ret);
+	goto out;
+
 clean:
 	kfree(rdev);
 	rdev = ERR_PTR(ret);
diff --git a/drivers/regulator/virtual.c b/drivers/regulator/virtual.c
index 3d08348584e1798e7d0c03a73c363a6c8d40a48a..71403fa3ffa1e04aa2bffe69403480b1bb5623f4 100644
--- a/drivers/regulator/virtual.c
+++ b/drivers/regulator/virtual.c
@@ -230,13 +230,13 @@ static ssize_t set_mode(struct device *dev, struct device_attribute *attr,
 	 * sysfs_streq() doesn't need the \n's, but we add them so the strings
 	 * will be shared with show_mode(), above.
 	 */
-	if (sysfs_streq(buf, "fast\n") == 0)
+	if (sysfs_streq(buf, "fast\n"))
 		mode = REGULATOR_MODE_FAST;
-	else if (sysfs_streq(buf, "normal\n") == 0)
+	else if (sysfs_streq(buf, "normal\n"))
 		mode = REGULATOR_MODE_NORMAL;
-	else if (sysfs_streq(buf, "idle\n") == 0)
+	else if (sysfs_streq(buf, "idle\n"))
 		mode = REGULATOR_MODE_IDLE;
-	else if (sysfs_streq(buf, "standby\n") == 0)
+	else if (sysfs_streq(buf, "standby\n"))
 		mode = REGULATOR_MODE_STANDBY;
 	else {
 		dev_err(dev, "Configuring invalid mode\n");
diff --git a/include/linux/regulator/driver.h b/include/linux/regulator/driver.h
index 4848d8dacd903b81edba899dd76d69eefed487a8..225f733e7533f40f149185b8f17ecce3e75ff8c9 100644
--- a/include/linux/regulator/driver.h
+++ b/include/linux/regulator/driver.h
@@ -50,6 +50,7 @@ enum regulator_status {
  * @set_current_limit: Configure a limit for a current-limited regulator.
  * @get_current_limit: Get the configured limit for a current-limited regulator.
  *
+ * @set_mode: Set the configured operating mode for the regulator.
  * @get_mode: Get the configured operating mode for the regulator.
  * @get_status: Return actual (not as-configured) status of regulator, as a
  *	REGULATOR_STATUS value (or negative errno)