[PATCH 4.14 127/137] hwmon: (adt7475) Make adt7475_read_word() return errors

[Greg Kroah-Hartman]

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Dan Carpenter <dan.carpenter@xxxxxxxxxx>

[ Upstream commit f196dec6d50abb2e65fb54a0621b2f1b4d922995 ]

The adt7475_read_word() function was meant to return negative error
codes on failure.

Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Reviewed-by: Tokunori Ikegami <ikegami@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/hwmon/adt7475.c |   14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

--- a/drivers/hwmon/adt7475.c
+++ b/drivers/hwmon/adt7475.c
@@ -303,14 +303,18 @@ static inline u16 volt2reg(int channel,
 	return clamp_val(reg, 0, 1023) & (0xff << 2);
 }
 
-static u16 adt7475_read_word(struct i2c_client *client, int reg)
+static int adt7475_read_word(struct i2c_client *client, int reg)
 {
-	u16 val;
+	int val1, val2;
 
-	val = i2c_smbus_read_byte_data(client, reg);
-	val |= (i2c_smbus_read_byte_data(client, reg + 1) << 8);
+	val1 = i2c_smbus_read_byte_data(client, reg);
+	if (val1 < 0)
+		return val1;
+	val2 = i2c_smbus_read_byte_data(client, reg + 1);
+	if (val2 < 0)
+		return val2;
 
-	return val;
+	return val1 | (val2 << 8);
 }
 
 static void adt7475_write_word(struct i2c_client *client, int reg, u16 val)