linux-kernel - [PATCH net-next] net: dsa: yt921x: Fix missing type casting to u64

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Message-ID: <20251024084918.1353031-1-mmyangfl@gmail.com>
Date: Fri, 24 Oct 2025 16:49:13 +0800
From: David Yang <mmyangfl@...il.com>
To: netdev@...r.kernel.org
Cc: David Yang <mmyangfl@...il.com>,
	Dan Carpenter <dan.carpenter@...aro.org>,
	Andrew Lunn <andrew@...n.ch>,
	Vladimir Oltean <olteanv@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH net-next] net: dsa: yt921x: Fix missing type casting to u64

Reported by the following Smatch static checker warning:

  drivers/net/dsa/yt921x.c:702 yt921x_read_mib()
  warn: was expecting a 64 bit value instead of '(~0)'

Reported-by: Dan Carpenter <dan.carpenter@...aro.org>
Closes: https://lore.kernel.org/netdev/aPsjYKQMzpY0nSXm@stanley.mountain/
Signed-off-by: David Yang <mmyangfl@...il.com>
---
 drivers/net/dsa/yt921x.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/dsa/yt921x.c b/drivers/net/dsa/yt921x.c
index ab762ffc4661..8baed8107512 100644
--- a/drivers/net/dsa/yt921x.c
+++ b/drivers/net/dsa/yt921x.c
@@ -699,7 +699,7 @@ static int yt921x_read_mib(struct yt921x_priv *priv, int port)
 			if (val < (u32)val)
 				/* overflow */
 				val += (u64)U32_MAX + 1;
-			val &= ~U32_MAX;
+			val &= ~(u64)U32_MAX;
 			val |= val0;
 		} else {
 			res = yt921x_reg_read(priv, reg + 4, &val1);
-- 
2.51.0