The patch below does not apply to the 5.15-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y git checkout FETCH_HEAD git cherry-pick -x d85cf67a339685beae1d0aee27b7f61da95455be # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2024051343-casket-astride-c192@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^..

Possible dependencies:

d85cf67a3396 ("net: bcmgenet: synchronize EXT_RGMII_OOB_CTRL access") 696450c05181 ("net: bcmgenet: Clear RGMII_LINK upon link down") fc13d8c03773 ("net: bcmgenet: pull mac_config from adjust_link") fcb5dfe7dc40 ("net: bcmgenet: remove old link state values") 50e356686fa9 ("net: bcmgenet: remove netif_carrier_off from adjust_link") b972b54a68b2 ("net: bcmgenet: Patch PHY interface for dedicated PHY driver")

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From d85cf67a339685beae1d0aee27b7f61da95455be Mon Sep 17 00:00:00 2001 From: Doug Berger opendmb@gmail.com Date: Thu, 25 Apr 2024 15:27:19 -0700 Subject: [PATCH] net: bcmgenet: synchronize EXT_RGMII_OOB_CTRL access

The EXT_RGMII_OOB_CTRL register can be written from different contexts. It is predominantly written from the adjust_link handler which is synchronized by the phydev->lock, but can also be written from a different context when configuring the mii in bcmgenet_mii_config().

The chances of contention are quite low, but it is conceivable that adjust_link could occur during resume when WoL is enabled so use the phydev->lock synchronizer in bcmgenet_mii_config() to be sure.

Fixes: afe3f907d20f ("net: bcmgenet: power on MII block for all MII modes") Cc: stable@vger.kernel.org Signed-off-by: Doug Berger opendmb@gmail.com Acked-by: Florian Fainelli florian.fainelli@broadcom.com Signed-off-by: David S. Miller davem@davemloft.net

diff --git a/drivers/net/ethernet/broadcom/genet/bcmmii.c b/drivers/net/ethernet/broadcom/genet/bcmmii.c index 9ada89355747..86a4aa72b3d4 100644 --- a/drivers/net/ethernet/broadcom/genet/bcmmii.c +++ b/drivers/net/ethernet/broadcom/genet/bcmmii.c @@ -2,7 +2,7 @@ /* * Broadcom GENET MDIO routines * - * Copyright (c) 2014-2017 Broadcom + * Copyright (c) 2014-2024 Broadcom */

#include <linux/acpi.h> @@ -275,6 +275,7 @@ int bcmgenet_mii_config(struct net_device *dev, bool init) * block for the interface to work, unconditionally clear the * Out-of-band disable since we do not need it. */ + mutex_lock(&phydev->lock); reg = bcmgenet_ext_readl(priv, EXT_RGMII_OOB_CTRL); reg &= ~OOB_DISABLE; if (priv->ext_phy) { @@ -286,6 +287,7 @@ int bcmgenet_mii_config(struct net_device *dev, bool init) reg |= RGMII_MODE_EN; } bcmgenet_ext_writel(priv, reg, EXT_RGMII_OOB_CTRL); + mutex_unlock(&phydev->lock);

if (init) dev_info(kdev, "configuring instance for %s\n", phy_name);