linux-kernel - [PATCH] net: dsa: sja1105: Remove unneeded cast in sja1105

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Message-Id: <20210223112003.2223332-1-geert+renesas@glider.be>
Date:   Tue, 23 Feb 2021 12:20:03 +0100
From:   Geert Uytterhoeven <geert+renesas@...der.be>
To:     Vladimir Oltean <olteanv@...il.com>, Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Geert Uytterhoeven <geert+renesas@...der.be>
Subject: [PATCH] net: dsa: sja1105: Remove unneeded cast in sja1105_crc32()

sja1105_unpack() takes a "const void *buf" as its first parameter, so
there is no need to cast away the "const" of the "buf" variable before
calling it.

Drop the cast, as it prevents the compiler performing some checks.

Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
---
Compile-tested only.

BTW, sja1105_packing() and packing() are really bad APIs, as the input
pointer parameters cannot be const due to the direction depending on
"op".  This means the compiler cannot do const checks.  Worse, callers
are required to cast away constness to prevent the compiler from
issueing warnings.  Please don't do this!
---
 drivers/net/dsa/sja1105/sja1105_static_config.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/dsa/sja1105/sja1105_static_config.c b/drivers/net/dsa/sja1105/sja1105_static_config.c
index 139b7b4fbd0d5252..a8efb7fac3955307 100644
--- a/drivers/net/dsa/sja1105/sja1105_static_config.c
+++ b/drivers/net/dsa/sja1105/sja1105_static_config.c
@@ -85,7 +85,7 @@ u32 sja1105_crc32(const void *buf, size_t len)
 	/* seed */
 	crc = ~0;
 	for (i = 0; i < len; i += 4) {
-		sja1105_unpack((void *)buf + i, &word, 31, 0, 4);
+		sja1105_unpack(buf + i, &word, 31, 0, 4);
 		crc = crc32_le(crc, (u8 *)&word, 4);
 	}
 	return ~crc;
-- 
2.25.1