rtc: ds1307: fix ds1307_native_smbus_read_block_data function
The i2c_smbus_read_i2c_block_data function returns 0 on success, not the
number of bytes written.
Hence, when there are 32 bytes or less to send, the
ds1307_native_smbus_write_block_data function returns 0 on success,
while it returns the number of bytes when there are more than 32.
The ds1307_write_block_data always returns the number of bytes on
success.
Signed-off-by: Nicolas Boullis <nboullis@debian.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
diff --git a/drivers/rtc/rtc-ds1307.c b/drivers/rtc/rtc-ds1307.c
index ecb7dba..eed5c06 100644
--- a/drivers/rtc/rtc-ds1307.c
+++ b/drivers/rtc/rtc-ds1307.c
@@ -275,9 +275,13 @@
{
u8 suboffset = 0;
- if (length <= I2C_SMBUS_BLOCK_MAX)
- return i2c_smbus_write_i2c_block_data(client,
+ if (length <= I2C_SMBUS_BLOCK_MAX) {
+ s32 retval = i2c_smbus_write_i2c_block_data(client,
command, length, values);
+ if (retval < 0)
+ return retval;
+ return length;
+ }
while (suboffset < length) {
s32 retval = i2c_smbus_write_i2c_block_data(client,