regulator: ab8500: Don't update info->update_val if write to register fails

This patch ensures info->update_val is consistent with current register value.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Acked-by: Bengt Jonsson <bengt.g.jonsson@stericsson.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

drivers/regulator/ab8500.c

@@ -392,9 +392,8 @@ static int ab8500_regulator_set_mode(struct regulator_dev *rdev,
 			val = info->mode_val_idle;
 			break;
 		default:
-			if (info->shared_mode)
-				mutex_unlock(&shared_mode_mutex);
-			return -EINVAL;
+			ret = -EINVAL;
+			goto out_unlock;
 		}
 
 		bank = info->mode_bank;
@@ -405,17 +404,14 @@ static int ab8500_regulator_set_mode(struct regulator_dev *rdev,
 
 		switch (mode) {
 		case REGULATOR_MODE_NORMAL:
-			info->update_val = info->update_val_normal;
 			val = info->update_val_normal;
 			break;
 		case REGULATOR_MODE_IDLE:
-			info->update_val = info->update_val_idle;
 			val = info->update_val_idle;
 			break;
 		default:
-			if (info->shared_mode)
-				mutex_unlock(&shared_mode_mutex);
-			return -EINVAL;
+			ret = -EINVAL;
+			goto out_unlock;
 		}
 
 		bank = info->update_bank;
@@ -426,9 +422,11 @@ static int ab8500_regulator_set_mode(struct regulator_dev *rdev,
 	if (dmr || ab8500_regulator_is_enabled(rdev)) {
 		ret = abx500_mask_and_set_register_interruptible(info->dev,
 			bank, reg, mask, val);
-		if (ret < 0)
+		if (ret < 0) {
 			dev_err(rdev_get_dev(rdev),
 				"couldn't set regulator mode\n");
+			goto out_unlock;
+		}
 
 		dev_vdbg(rdev_get_dev(rdev),
 			"%s-set_mode (bank, reg, mask, value): "
@@ -437,6 +435,10 @@ static int ab8500_regulator_set_mode(struct regulator_dev *rdev,
 			mask, val);
 	}
 
+	if (!dmr)
+		info->update_val = val;
+
+out_unlock:
 	if (info->shared_mode)
 		mutex_unlock(&shared_mode_mutex);