netdev - [PATCH net] mctp: return -ENOPROTOOPT for unknown getsockopt options

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Message-ID: <20250902102059.1370008-1-alok.a.tiwari@oracle.com>
Date: Tue,  2 Sep 2025 03:20:55 -0700
From: Alok Tiwari <alok.a.tiwari@...cle.com>
To: jk@...econstruct.com.au, matt@...econstruct.com.au, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        horms@...nel.org, netdev@...r.kernel.org
Cc: alok.a.tiwari@...cle.com
Subject: [PATCH net] mctp: return -ENOPROTOOPT for unknown getsockopt options

In mctp_getsockopt(), unrecognized options currently return -EINVAL.
In contrast, mctp_setsockopt() returns -ENOPROTOOPT for unknown
options.

Update mctp_getsockopt() to also return -ENOPROTOOPT for unknown
options. This aligns the behavior of getsockopt() and setsockopt(),
and matches the standard kernel socket API convention for handling
unsupported options.

Fixes: 99ce45d5e7db ("mctp: Implement extended addressing")
Signed-off-by: Alok Tiwari <alok.a.tiwari@...cle.com>
---
 net/mctp/af_mctp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/mctp/af_mctp.c b/net/mctp/af_mctp.c
index df4e8cf33899..685524800d70 100644
--- a/net/mctp/af_mctp.c
+++ b/net/mctp/af_mctp.c
@@ -425,7 +425,7 @@ static int mctp_getsockopt(struct socket *sock, int level, int optname,
 		return 0;
 	}
 
-	return -EINVAL;
+	return -ENOPROTOOPT;
 }
 
 /* helpers for reading/writing the tag ioc, handling compatibility across the
-- 
2.50.1