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@xxxxxxxxxxxxxx>
References: 85d77047c4ea ("drivers/rtc/rtc-m41t80.c: propagate error value from smbus functions")
---
Hi,
I think this does not qualify for backporting, but please feel free to
decide otherwise.
This change I did verify at run time to the extent I was able to, but I
didn't try to trigger artificial errors. Also the M41T81, which is the
device I've been using this driver with, does not have battery failure
indication implemented, so I could not execute the procfs handling path
(again without making some artificial changes). These changes should be
obvious regardless.
I'll be posting further patches over the coming weeks, based on my
original effort as archived here: <https://lkml.org/lkml/2008/5/12/385>,
<https://lore.kernel.org/patchwork/project/lkml/list/?series=73524&archive=both>
However I have just realised they'll need another iteration before I post
them. So for now just these two obvious fixes.
Please apply.
Maciej
---
drivers/rtc/rtc-m41t80.c | 13 ++++++++-----
1 file changed, 8 insertions(+), 5 deletions(-)
linux-rtc-m41t80-err.diff
Index: linux-20181008-swarm64-eb/drivers/rtc/rtc-m41t80.c
===================================================================
--- linux-20181008-swarm64-eb.orig/drivers/rtc/rtc-m41t80.c
+++ linux-20181008-swarm64-eb/drivers/rtc/rtc-m41t80.c
@@ -217,7 +217,7 @@ static int m41t80_rtc_read_time(struct d
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 de
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
{
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");
}
