netdev - [PATCH net-next v4 03/18] net: stmmac: use correct type for tx_lpi

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Message-Id: <E1tVZDc-0002Jx-3b@rmk-PC.armlinux.org.uk>
Date: Wed, 08 Jan 2025 16:47:44 +0000
From: "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>
To: Andrew Lunn <andrew@...n.ch>,
	Heiner Kallweit <hkallweit1@...il.com>
Cc: Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Jose Abreu <joabreu@...opsys.com>,
	linux-arm-kernel@...ts.infradead.org,
	linux-stm32@...md-mailman.stormreply.com,
	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	netdev@...r.kernel.org,
	Paolo Abeni <pabeni@...hat.com>
Subject: [PATCH net-next v4 03/18] net: stmmac: use correct type for
 tx_lpi_timer

The ethtool interface uses u32 for tx_lpi_timer, and so does phylib.
Use u32 to store this internally within stmmac rather than "int"
which could misinterpret large values.

Correct "value" in dwmac4_set_eee_lpi_entry_timer() to use u32
rather than int, which is derived from tx_lpi_timer. Even though this
path won't be used with values larger than STMMAC_ET_MAX, this brings
consistency of type usage to the stmmac code for this variable.

We leave eee_timer unchanged for now, with the assumption that values
up to INT_MAX will safely fit in a u32.

Tested-by: Choong Yong Liang <yong.liang.choong@...ux.intel.com>
Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
---
 drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c | 4 ++--
 drivers/net/ethernet/stmicro/stmmac/hwif.h        | 2 +-
 drivers/net/ethernet/stmicro/stmmac/stmmac.h      | 2 +-
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 4 ++--
 4 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c b/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c
index c36f90a782c5..9ed8620580a8 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c
@@ -420,10 +420,10 @@ static void dwmac4_set_eee_pls(struct mac_device_info *hw, int link)
 	writel(value, ioaddr + GMAC4_LPI_CTRL_STATUS);
 }
 
-static void dwmac4_set_eee_lpi_entry_timer(struct mac_device_info *hw, int et)
+static void dwmac4_set_eee_lpi_entry_timer(struct mac_device_info *hw, u32 et)
 {
 	void __iomem *ioaddr = hw->pcsr;
-	int value = et & STMMAC_ET_MAX;
+	u32 value = et & STMMAC_ET_MAX;
 	int regval;
 
 	/* Program LPI entry timer value into register */
diff --git a/drivers/net/ethernet/stmicro/stmmac/hwif.h b/drivers/net/ethernet/stmicro/stmmac/hwif.h
index 2f7295b6c1c5..0f200b72c225 100644
--- a/drivers/net/ethernet/stmicro/stmmac/hwif.h
+++ b/drivers/net/ethernet/stmicro/stmmac/hwif.h
@@ -363,7 +363,7 @@ struct stmmac_ops {
 	void (*set_eee_mode)(struct mac_device_info *hw,
 			     bool en_tx_lpi_clockgating);
 	void (*reset_eee_mode)(struct mac_device_info *hw);
-	void (*set_eee_lpi_entry_timer)(struct mac_device_info *hw, int et);
+	void (*set_eee_lpi_entry_timer)(struct mac_device_info *hw, u32 et);
 	void (*set_eee_timer)(struct mac_device_info *hw, int ls, int tw);
 	void (*set_eee_pls)(struct mac_device_info *hw, int link);
 	void (*debug)(struct stmmac_priv *priv, void __iomem *ioaddr,
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac.h b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
index df386fc948ec..984e708d019f 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac.h
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
@@ -307,7 +307,7 @@ struct stmmac_priv {
 	int lpi_irq;
 	int eee_enabled;
 	int eee_active;
-	int tx_lpi_timer;
+	u32 tx_lpi_timer;
 	int tx_lpi_enabled;
 	int eee_tw_timer;
 	bool eee_sw_timer_en;
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index e80ac74538d2..afdf992cd91a 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -394,11 +394,11 @@ static inline u32 stmmac_rx_dirty(struct stmmac_priv *priv, u32 queue)
 
 static void stmmac_lpi_entry_timer_config(struct stmmac_priv *priv, bool en)
 {
-	int tx_lpi_timer;
+	u32 tx_lpi_timer;
 
 	/* Clear/set the SW EEE timer flag based on LPI ET enablement */
 	priv->eee_sw_timer_en = en ? 0 : 1;
-	tx_lpi_timer  = en ? priv->tx_lpi_timer : 0;
+	tx_lpi_timer = en ? priv->tx_lpi_timer : 0;
 	stmmac_set_eee_lpi_timer(priv, priv->hw, tx_lpi_timer);
 }
 
-- 
2.30.2