[PATCH 5.15.y] net: bcmgenet: synchronize UMAC_CMD access

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The UMAC_CMD register is written from different execution
contexts and has insufficient synchronization protections to
prevent possible corruption. Of particular concern are the
acceses from the phy_device delayed work context used by the
adjust_link call and the BH context that may be used by the
ndo_set_rx_mode call.

A spinlock is added to the driver to protect contended register
accesses (i.e. reg_lock) and it is used to synchronize accesses
to UMAC_CMD.

Fixes: 1c1008c793fa ("net: bcmgenet: add main driver file")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Doug Berger <opendmb@xxxxxxxxx>
Acked-by: Florian Fainelli <florian.fainelli@xxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
(cherry picked from commit 0d5e2a82232605b337972fb2c7d0cbc46898aca1)
Signed-off-by: Doug Berger <opendmb@xxxxxxxxx>
---
 drivers/net/ethernet/broadcom/genet/bcmgenet.c     | 12 +++++++++++-
 drivers/net/ethernet/broadcom/genet/bcmgenet.h     |  2 ++
 drivers/net/ethernet/broadcom/genet/bcmgenet_wol.c |  6 ++++++
 drivers/net/ethernet/broadcom/genet/bcmmii.c       |  2 ++
 4 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/broadcom/genet/bcmgenet.c b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
index a2b736a9d20c..0cfb00feb607 100644
--- a/drivers/net/ethernet/broadcom/genet/bcmgenet.c
+++ b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
@@ -2424,14 +2424,18 @@ static void umac_enable_set(struct bcmgenet_priv *priv, u32 mask, bool enable)
 {
 	u32 reg;
 
+	spin_lock_bh(&priv->reg_lock);
 	reg = bcmgenet_umac_readl(priv, UMAC_CMD);
-	if (reg & CMD_SW_RESET)
+	if (reg & CMD_SW_RESET) {
+		spin_unlock_bh(&priv->reg_lock);
 		return;
+	}
 	if (enable)
 		reg |= mask;
 	else
 		reg &= ~mask;
 	bcmgenet_umac_writel(priv, reg, UMAC_CMD);
+	spin_unlock_bh(&priv->reg_lock);
 
 	/* UniMAC stops on a packet boundary, wait for a full-size packet
 	 * to be processed
@@ -2447,8 +2451,10 @@ static void reset_umac(struct bcmgenet_priv *priv)
 	udelay(10);
 
 	/* issue soft reset and disable MAC while updating its registers */
+	spin_lock_bh(&priv->reg_lock);
 	bcmgenet_umac_writel(priv, CMD_SW_RESET, UMAC_CMD);
 	udelay(2);
+	spin_unlock_bh(&priv->reg_lock);
 }
 
 static void bcmgenet_intr_disable(struct bcmgenet_priv *priv)
@@ -3566,16 +3572,19 @@ static void bcmgenet_set_rx_mode(struct net_device *dev)
 	 * 3. The number of filters needed exceeds the number filters
 	 *    supported by the hardware.
 	*/
+	spin_lock(&priv->reg_lock);
 	reg = bcmgenet_umac_readl(priv, UMAC_CMD);
 	if ((dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) ||
 	    (nfilter > MAX_MDF_FILTER)) {
 		reg |= CMD_PROMISC;
 		bcmgenet_umac_writel(priv, reg, UMAC_CMD);
+		spin_unlock(&priv->reg_lock);
 		bcmgenet_umac_writel(priv, 0, UMAC_MDF_CTRL);
 		return;
 	} else {
 		reg &= ~CMD_PROMISC;
 		bcmgenet_umac_writel(priv, reg, UMAC_CMD);
+		spin_unlock(&priv->reg_lock);
 	}
 
 	/* update MDF filter */
@@ -3969,6 +3978,7 @@ static int bcmgenet_probe(struct platform_device *pdev)
 		goto err;
 	}
 
+	spin_lock_init(&priv->reg_lock);
 	spin_lock_init(&priv->lock);
 
 	SET_NETDEV_DEV(dev, &pdev->dev);
diff --git a/drivers/net/ethernet/broadcom/genet/bcmgenet.h b/drivers/net/ethernet/broadcom/genet/bcmgenet.h
index 0eeb304a4263..34a3c448d44f 100644
--- a/drivers/net/ethernet/broadcom/genet/bcmgenet.h
+++ b/drivers/net/ethernet/broadcom/genet/bcmgenet.h
@@ -572,6 +572,8 @@ struct bcmgenet_rxnfc_rule {
 /* device context */
 struct bcmgenet_priv {
 	void __iomem *base;
+	/* reg_lock: lock to serialize access to shared registers */
+	spinlock_t reg_lock;
 	enum bcmgenet_version version;
 	struct net_device *dev;
 
diff --git a/drivers/net/ethernet/broadcom/genet/bcmgenet_wol.c b/drivers/net/ethernet/broadcom/genet/bcmgenet_wol.c
index f55d9d9c01a8..38d41028e98a 100644
--- a/drivers/net/ethernet/broadcom/genet/bcmgenet_wol.c
+++ b/drivers/net/ethernet/broadcom/genet/bcmgenet_wol.c
@@ -133,6 +133,7 @@ int bcmgenet_wol_power_down_cfg(struct bcmgenet_priv *priv,
 	}
 
 	/* Can't suspend with WoL if MAC is still in reset */
+	spin_lock_bh(&priv->reg_lock);
 	reg = bcmgenet_umac_readl(priv, UMAC_CMD);
 	if (reg & CMD_SW_RESET)
 		reg &= ~CMD_SW_RESET;
@@ -140,6 +141,7 @@ int bcmgenet_wol_power_down_cfg(struct bcmgenet_priv *priv,
 	/* disable RX */
 	reg &= ~CMD_RX_EN;
 	bcmgenet_umac_writel(priv, reg, UMAC_CMD);
+	spin_unlock_bh(&priv->reg_lock);
 	mdelay(10);
 
 	if (priv->wolopts & (WAKE_MAGIC | WAKE_MAGICSECURE)) {
@@ -185,6 +187,7 @@ int bcmgenet_wol_power_down_cfg(struct bcmgenet_priv *priv,
 	}
 
 	/* Enable CRC forward */
+	spin_lock_bh(&priv->reg_lock);
 	reg = bcmgenet_umac_readl(priv, UMAC_CMD);
 	priv->crc_fwd_en = 1;
 	reg |= CMD_CRC_FWD;
@@ -192,6 +195,7 @@ int bcmgenet_wol_power_down_cfg(struct bcmgenet_priv *priv,
 	/* Receiver must be enabled for WOL MP detection */
 	reg |= CMD_RX_EN;
 	bcmgenet_umac_writel(priv, reg, UMAC_CMD);
+	spin_unlock_bh(&priv->reg_lock);
 
 	reg = UMAC_IRQ_MPD_R;
 	if (hfb_enable)
@@ -238,7 +242,9 @@ void bcmgenet_wol_power_up_cfg(struct bcmgenet_priv *priv,
 	}
 
 	/* Disable CRC Forward */
+	spin_lock_bh(&priv->reg_lock);
 	reg = bcmgenet_umac_readl(priv, UMAC_CMD);
 	reg &= ~CMD_CRC_FWD;
 	bcmgenet_umac_writel(priv, reg, UMAC_CMD);
+	spin_unlock_bh(&priv->reg_lock);
 }
diff --git a/drivers/net/ethernet/broadcom/genet/bcmmii.c b/drivers/net/ethernet/broadcom/genet/bcmmii.c
index 6d823c107476..8c743e67d9f3 100644
--- a/drivers/net/ethernet/broadcom/genet/bcmmii.c
+++ b/drivers/net/ethernet/broadcom/genet/bcmmii.c
@@ -91,6 +91,7 @@ void bcmgenet_mii_setup(struct net_device *dev)
 		reg |= RGMII_LINK;
 		bcmgenet_ext_writel(priv, reg, EXT_RGMII_OOB_CTRL);
 
+		spin_lock_bh(&priv->reg_lock);
 		reg = bcmgenet_umac_readl(priv, UMAC_CMD);
 		reg &= ~((CMD_SPEED_MASK << CMD_SPEED_SHIFT) |
 			       CMD_HD_EN |
@@ -103,6 +104,7 @@ void bcmgenet_mii_setup(struct net_device *dev)
 			reg |= CMD_TX_EN | CMD_RX_EN;
 		}
 		bcmgenet_umac_writel(priv, reg, UMAC_CMD);
+		spin_unlock_bh(&priv->reg_lock);
 
 		priv->eee.eee_active = phy_init_eee(phydev, 0) >= 0;
 		bcmgenet_eee_enable_set(dev,
-- 
2.34.1





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