linux-kernel - [PATCH net v2] ncsi: Revert NCSI link loss/gain commit

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Message-ID: <20231109205137.819392-1-johnathanx.mantey@intel.com>
Date:   Thu, 9 Nov 2023 12:51:37 -0800
From:   Johnathan Mantey <johnathanx.mantey@...el.com>
To:     <netdev@...r.kernel.org>
CC:     <sam@...dozajonas.com>, <edumazet@...gle.com>, <kuba@...nel.org>,
        <pabeni@...hat.com>, <johnathanx.mantey@...el.com>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH net v2] ncsi: Revert NCSI link loss/gain commit

The NCSI commit
ncsi: Propagate carrier gain/loss events to the NCSI controller
introduced unwanted behavior.

The intent for the commit was to be able to detect carrier loss/gain
for just the NIC connected to the BMC. The unwanted effect is a
carrier loss for auxiliary paths also causes the BMC to lose
carrier. The BMC never regains carrier despite the secondary NIC
regaining a link.

This change, when merged, needs to be backported to stable kernels.
5.4-stable, 5.10-stable, 5.15-stable, 6.1-stable, 6.5-stable

Fixes: 3780bb29311e ncsi: Propagate carrier gain/loss events to the
CC: stable@...r.kernel.org
Signed-off-by: Johnathan Mantey <johnathanx.mantey@...el.com>
---
 net/ncsi/ncsi-aen.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/net/ncsi/ncsi-aen.c b/net/ncsi/ncsi-aen.c
index f8854bff286c..62fb1031763d 100644
--- a/net/ncsi/ncsi-aen.c
+++ b/net/ncsi/ncsi-aen.c
@@ -89,11 +89,6 @@ static int ncsi_aen_handler_lsc(struct ncsi_dev_priv *ndp,
 	if ((had_link == has_link) || chained)
 		return 0;

-	if (had_link)
-		netif_carrier_off(ndp->ndev.dev);
-	else
-		netif_carrier_on(ndp->ndev.dev);
-
 	if (!ndp->multi_package && !nc->package->multi_channel) {
 		if (had_link) {
 			ndp->flags |= NCSI_DEV_RESHUFFLE;
-- 
2.41.0