mv88e6xxx_tai_write() can return error code (-EOPNOTSUPP ...) if failed.
So check the value of 'ret' after calling mv88e6xxx_tai_write().
Signed-off-by: Su Hui <suhui@xxxxxxxxxxxx>
---
drivers/net/dsa/mv88e6xxx/ptp.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/net/dsa/mv88e6xxx/ptp.c b/drivers/net/dsa/mv88e6xxx/ptp.c
index ea17231dc34e..56391e09b325 100644
--- a/drivers/net/dsa/mv88e6xxx/ptp.c
+++ b/drivers/net/dsa/mv88e6xxx/ptp.c
@@ -182,6 +182,10 @@ static void mv88e6352_tai_event_work(struct work_struct *ugly)
mv88e6xxx_reg_lock(chip);
err = mv88e6xxx_tai_write(chip, MV88E6XXX_TAI_EVENT_STATUS, status[0]);
mv88e6xxx_reg_unlock(chip);
+ if (err) {
+ dev_err(chip->dev, "failed to write TAI status register\n");
+ return;
+ }
/* This is an external timestamp */
ev.type = PTP_CLOCK_EXTTS;
--
2.30.2
