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@vger.kernel.org
Signed-off-by: Johnathan Mantey <johnathanx.mantey@intel.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

On Thu, Nov 09, 2023 at 12:51:37PM -0800, Johnathan Mantey wrote:
> 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@vger.kernel.org
> Signed-off-by: Johnathan Mantey <johnathanx.mantey@intel.com>

Hi Johnathan,

thanks for your patch.
Some minor feedback from my side.

1. The correct format for the tag above is:

   Fixes: 3780bb29311e ("ncsi: Propagate carrier gain/loss events to the NCSI controller")

2. I think it is usual to format the subject and commit messages for
   revert commits a bit like this:

   Subject: [PATCH net vX] Revert "ncsi: Propagate carrier gain/loss events to the NCSI controller"

   This reverts commit 3780bb29311eccb7a1c9641032a112eed237f7e3.

   The cited commit 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.

   ...