rtc: m41t80: Complete error propagation from SMBus calls

Complement commit 85d77047c4ea ("drivers/rtc/rtc-m41t80.c: propagate
error value from smbus functions") and correct the remaining places that
fail to propagate the error code from SMBus calls.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
References: 85d77047c4ea ("drivers/rtc/rtc-m41t80.c: propagate error value from smbus functions")
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

1 files changed, 8 insertions, 5 deletions

diff --git a/drivers/rtc/rtc-m41t80.c b/drivers/rtc/rtc-m41t80.c
index 7431a795a624..a39138932379 100644
--- a/drivers/rtc/rtc-m41t80.c
+++ b/drivers/rtc/rtc-m41t80.c
@@ -217,7 +217,7 @@ static int m41t80_rtc_read_time(struct device *dev, struct rtc_time *tm)
                                             sizeof(buf), buf);
         if (err < 0) {
                 dev_err(&client->dev, "Unable to read date\n");
-                return -EIO;
+                return err;
         }
 
         tm->tm_sec = bcd2bin(buf[M41T80_REG_SEC] & 0x7f);
@@ -274,10 +274,11 @@ static int m41t80_rtc_set_time(struct device *dev, struct rtc_time *tm)
         if (flags < 0)
                 return flags;
 
-        if (i2c_smbus_write_byte_data(client, M41T80_REG_FLAGS,
-                                      flags & ~M41T80_FLAGS_OF)) {
+        err = i2c_smbus_write_byte_data(client, M41T80_REG_FLAGS,
+                                        flags & ~M41T80_FLAGS_OF);
+        if (err < 0) {
                 dev_err(&client->dev, "Unable to write flags register\n");
-                return -EIO;
+                return err;
         }
 
         return err;
@@ -287,10 +288,12 @@ static int m41t80_rtc_proc(struct device *dev, struct seq_file *seq)
 {
         struct i2c_client *client = to_i2c_client(dev);
         struct m41t80_data *clientdata = i2c_get_clientdata(client);
-        u8 reg;
+        int reg;
 
         if (clientdata->features & M41T80_FEATURE_BL) {
                 reg = i2c_smbus_read_byte_data(client, M41T80_REG_FLAGS);
+                if (reg < 0)
+                        return reg;
                 seq_printf(seq, "battery\t\t: %s\n",
                            (reg & M41T80_FLAGS_BATT_LOW) ? "exhausted" : "ok");
         }