linux-kernel - [PATCH] ptp: Add error handling for adjfine callback in ptp_clock

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Message-Id: <20241125105954.1509971-1-ajay.kaher@broadcom.com>
Date: Mon, 25 Nov 2024 10:59:54 +0000
From: Ajay Kaher <ajay.kaher@...adcom.com>
To: richardcochran@...il.com,
	netdev@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
	nick.shi@...adcom.com,
	ajay.kaher@...adcom.com,
	alexey.makhalov@...adcom.com,
	vasavi.sirnapalli@...adcom.com,
	vamsi-krishna.brahmajosyula@...adcom.com,
	florian.fainelli@...adcom.com
Subject: [PATCH]  ptp: Add error handling for adjfine callback in ptp_clock_adjtime

ptp_clock_adjtime sets ptp->dialed_frequency even when adjfine
callback returns an error. This causes subsequent reads to return
an incorrect value.

Fix this by adding error check before ptp->dialed_frequency is set.

Fixes: 39a8cbd9ca05 ("ptp: remember the adjusted frequency")
Signed-off-by: Ajay Kaher <ajay.kaher@...adcom.com>
---
 drivers/ptp/ptp_clock.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/ptp/ptp_clock.c b/drivers/ptp/ptp_clock.c
index c56cd0f..77a36e7 100644
--- a/drivers/ptp/ptp_clock.c
+++ b/drivers/ptp/ptp_clock.c
@@ -150,7 +150,8 @@ static int ptp_clock_adjtime(struct posix_clock *pc, struct __kernel_timex *tx)
 		if (ppb > ops->max_adj || ppb < -ops->max_adj)
 			return -ERANGE;
 		err = ops->adjfine(ops, tx->freq);
-		ptp->dialed_frequency = tx->freq;
+		if (!err)
+			ptp->dialed_frequency = tx->freq;
 	} else if (tx->modes & ADJ_OFFSET) {
 		if (ops->adjphase) {
 			s32 max_phase_adj = ops->getmaxphase(ops);
-- 
2.39.4