netdev - [PATCH] net: dsa: mv88e6xxx: add an error code check in mv88e6352_tai_event

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Message-Id: <20231020090003.200092-1-suhui@nfschina.com>
Date: Fri, 20 Oct 2023 17:00:04 +0800
From: Su Hui <suhui@...china.com>
To: andrew@...n.ch,
	f.fainelli@...il.com,
	olteanv@...il.com,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	richardcochran@...il.com
Cc: Su Hui <suhui@...china.com>,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [PATCH] net: dsa: mv88e6xxx: add an error code check in mv88e6352_tai_event_work

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@...china.com>
---
 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