[PATCH v3] i2c: k1: check for transfer error

[Alex Elder <elder@riscstar.com>]

If spacemit_i2c_xfer_msg() times out waiting for a message transfer to
complete, or if the hardware reports an error, it returns a negative
error code (-ETIMEDOUT, -EAGAIN, -ENXIO. or -EIO).

The sole caller of spacemit_i2c_xfer_msg() is spacemit_i2c_xfer(),
which is the i2c_algorithm->xfer callback function.  It currently
does not save the value returned by spacemit_i2c_xfer_msg().

The result is that transfer errors go unreported, and a caller
has no indication anything is wrong.

When this code was out for review, the return value *was* checked
in early versions.  But for some reason, that assignment got dropped
between versions 5 and 6 of the series, perhaps related to reworking
the code to merge spacemit_i2c_xfer_core() into spacemit_i2c_xfer().

Simply assigning the value returned to "ret" fixes the problem.

Fixes: 5ea558473fa31 ("i2c: spacemit: add support for SpacemiT K1 SoC")
Signed-off-by: Alex Elder <elder@riscstar.com>
Reviewed-by: Troy Mitchell <troymitchell988@gmail.com>
---
v3: Rebased on v6.16-rc2; included version in message subject

 drivers/i2c/busses/i2c-k1.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/i2c/busses/i2c-k1.c b/drivers/i2c/busses/i2c-k1.c
index 5965b4cf6220e..b68a21fff0b56 100644
--- a/drivers/i2c/busses/i2c-k1.c
+++ b/drivers/i2c/busses/i2c-k1.c
@@ -477,7 +477,7 @@ static int spacemit_i2c_xfer(struct i2c_adapter *adapt, struct i2c_msg *msgs, in
 
 	ret = spacemit_i2c_wait_bus_idle(i2c);
 	if (!ret)
-		spacemit_i2c_xfer_msg(i2c);
+		ret = spacemit_i2c_xfer_msg(i2c);
 	else if (ret < 0)
 		dev_dbg(i2c->dev, "i2c transfer error: %d\n", ret);
 	else
-- 
2.45.2