linux-kernel - [PATCH resubmit net] net: fec: Stop PPS on driver remove

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Message-ID: <20240807080956.2556602-1-csokas.bence@prolan.hu>
Date: Wed, 7 Aug 2024 10:09:56 +0200
From: Csókás, Bence <csokas.bence@...lan.hu>
To: Fugang Duan <B38611@...escale.com>, "David S. Miller"
	<davem@...emloft.net>, Lucas Stach <l.stach@...gutronix.de>,
	<imx@...ts.linux.dev>, <netdev@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
CC: Csókás, Bence <csokas.bence@...lan.hu>, "Fabio
 Estevam" <festevam@...il.com>, Wei Fang <wei.fang@....com>, Shenwei Wang
	<shenwei.wang@....com>, Clark Wang <xiaoning.wang@....com>, Eric Dumazet
	<edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni
	<pabeni@...hat.com>, Richard Cochran <richardcochran@...il.com>
Subject: [PATCH resubmit net] net: fec: Stop PPS on driver remove

PPS was not stopped in `fec_ptp_stop()`, called when
the adapter was removed. Consequentially, you couldn't
safely reload the driver with the PPS signal on.

Fixes: 32cba57ba74b ("net: fec: introduce fec_ptp_stop and use in probe fail path")

Reviewed-by: Fabio Estevam <festevam@...il.com>
Link: https://lore.kernel.org/netdev/CAOMZO5BzcZR8PwKKwBssQq_wAGzVgf1ffwe_nhpQJjviTdxy-w@mail.gmail.com/T/#m01dcb810bfc451a492140f6797ca77443d0cb79f
Signed-off-by: Csókás, Bence <csokas.bence@...lan.hu>
---
 drivers/net/ethernet/freescale/fec_ptp.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/freescale/fec_ptp.c b/drivers/net/ethernet/freescale/fec_ptp.c
index e32f6724f568..2e4f3e1782a2 100644
--- a/drivers/net/ethernet/freescale/fec_ptp.c
+++ b/drivers/net/ethernet/freescale/fec_ptp.c
@@ -775,6 +775,9 @@ void fec_ptp_stop(struct platform_device *pdev)
 	struct net_device *ndev = platform_get_drvdata(pdev);
 	struct fec_enet_private *fep = netdev_priv(ndev);
 
+	if (fep->pps_enable)
+		fec_ptp_enable_pps(fep, 0);
+
 	cancel_delayed_work_sync(&fep->time_keep);
 	hrtimer_cancel(&fep->perout_timer);
 	if (fep->ptp_clock)
-- 
2.34.1