diff options
| author | Doug Berger <opendmb@gmail.com> | 2024-04-25 15:27:19 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2024-04-29 06:24:21 +0100 |
| commit | d85cf67a339685beae1d0aee27b7f61da95455be (patch) | |
| tree | 43f83f2b75f56ccec40b0e048a91a5df0fe5ed92 | |
| parent | b2ff42c6d3abc26ef0f395fe9ee8c64364fbaa22 (diff) | |
| download | net-d85cf67a339685beae1d0aee27b7f61da95455be.tar.gz | |
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>
| -rw-r--r-- | drivers/net/ethernet/broadcom/genet/bcmmii.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/net/ethernet/broadcom/genet/bcmmii.c b/drivers/net/ethernet/broadcom/genet/bcmmii.c index 9ada8935574755..86a4aa72b3d4b3 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); |