6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Ajay Kaher <ajay.kaher@xxxxxxxxxxxx>
[ Upstream commit 98337d7c87577ded71114f6976edb70a163e27bc ]
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@xxxxxxxxxxxx>
Acked-by: Richard Cochran <richardcochran@xxxxxxxxx>
Link: https://patch.msgid.link/20241125105954.1509971-1-ajay.kaher@xxxxxxxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
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 9a50bfb56453c..b586da2e30023 100644
--- a/drivers/ptp/ptp_clock.c
+++ b/drivers/ptp/ptp_clock.c
@@ -133,7 +133,8 @@ 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);
--
2.43.0
