netdev - [PATCH net-next 1/2] net: stmmac: stmmac_is_jumbo

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Message-Id: <E1vLIWR-0000000Ewkf-1Tdx@rmk-PC.armlinux.org.uk>
Date: Tue, 18 Nov 2025 10:01:15 +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>,
	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 1/2] net: stmmac: stmmac_is_jumbo_frm() len should be
 unsigned

stmmac_is_jumbo_frm() and the is_jumbo_frm() methods take skb->len
which is an unsigned int. Avoid an implicit cast to "int" via the
method parameter and then incorrectly doing signed comparisons on
this unsigned value.

Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
---
 drivers/net/ethernet/stmicro/stmmac/chain_mode.c | 2 +-
 drivers/net/ethernet/stmicro/stmmac/hwif.h       | 2 +-
 drivers/net/ethernet/stmicro/stmmac/ring_mode.c  | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/chain_mode.c b/drivers/net/ethernet/stmicro/stmmac/chain_mode.c
index fb55efd52240..d14b56e5ed40 100644
--- a/drivers/net/ethernet/stmicro/stmmac/chain_mode.c
+++ b/drivers/net/ethernet/stmicro/stmmac/chain_mode.c
@@ -83,7 +83,7 @@ static int jumbo_frm(struct stmmac_tx_queue *tx_q, struct sk_buff *skb,
 	return entry;
 }
 
-static unsigned int is_jumbo_frm(int len, int enh_desc)
+static unsigned int is_jumbo_frm(unsigned int len, int enh_desc)
 {
 	unsigned int ret = 0;
 
diff --git a/drivers/net/ethernet/stmicro/stmmac/hwif.h b/drivers/net/ethernet/stmicro/stmmac/hwif.h
index d359722100fa..4953e0fab547 100644
--- a/drivers/net/ethernet/stmicro/stmmac/hwif.h
+++ b/drivers/net/ethernet/stmicro/stmmac/hwif.h
@@ -541,7 +541,7 @@ struct stmmac_rx_queue;
 struct stmmac_mode_ops {
 	void (*init) (void *des, dma_addr_t phy_addr, unsigned int size,
 		      unsigned int extend_desc);
-	unsigned int (*is_jumbo_frm) (int len, int ehn_desc);
+	unsigned int (*is_jumbo_frm)(unsigned int len, int ehn_desc);
 	int (*jumbo_frm)(struct stmmac_tx_queue *tx_q, struct sk_buff *skb,
 			 int csum);
 	int (*set_16kib_bfsize)(int mtu);
diff --git a/drivers/net/ethernet/stmicro/stmmac/ring_mode.c b/drivers/net/ethernet/stmicro/stmmac/ring_mode.c
index d218412ca832..039903c424df 100644
--- a/drivers/net/ethernet/stmicro/stmmac/ring_mode.c
+++ b/drivers/net/ethernet/stmicro/stmmac/ring_mode.c
@@ -91,7 +91,7 @@ static int jumbo_frm(struct stmmac_tx_queue *tx_q, struct sk_buff *skb,
 	return entry;
 }
 
-static unsigned int is_jumbo_frm(int len, int enh_desc)
+static unsigned int is_jumbo_frm(unsigned int len, int enh_desc)
 {
 	unsigned int ret = 0;
 
-- 
2.47.3