[PATCH] regulator: max14577: Add error check for max14577_read_reg()

[Wentao Liang]

The function max14577_reg_get_current_limit() calls the function
max14577_read_reg(), but does not check its return value. A proper
implementation can be found in max14577_get_online().

Add a error check for the max14577_read_reg() and return error code
if the function fails.

Fixes: b0902bbeb768 ("regulator: max14577: Add regulator driver for Maxim 14577")
Cc: stable@xxxxxxxxxxxxxxx # v3.14
Signed-off-by: Wentao Liang <vulab@xxxxxxxxxxx>
---
 drivers/regulator/max14577-regulator.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/regulator/max14577-regulator.c b/drivers/regulator/max14577-regulator.c
index 5e7171b9065a..41fd15adfd1f 100644
--- a/drivers/regulator/max14577-regulator.c
+++ b/drivers/regulator/max14577-regulator.c
@@ -40,11 +40,14 @@ static int max14577_reg_get_current_limit(struct regulator_dev *rdev)
 	struct max14577 *max14577 = rdev_get_drvdata(rdev);
 	const struct maxim_charger_current *limits =
 		&maxim_charger_currents[max14577->dev_type];
+	int ret;
 
 	if (rdev_get_id(rdev) != MAX14577_CHARGER)
 		return -EINVAL;
 
-	max14577_read_reg(rmap, MAX14577_CHG_REG_CHG_CTRL4, &reg_data);
+	ret = max14577_read_reg(rmap, MAX14577_CHG_REG_CHG_CTRL4, &reg_data);
+	if (ret < 0)
+		return ret;
 
 	if ((reg_data & CHGCTRL4_MBCICHWRCL_MASK) == 0)
 		return limits->min;
-- 
2.42.0.windows.2