netdev - [PATCH net-next 2/2] mptcp: return 0 instead of 'err' var

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Date:   Thu,  8 Dec 2022 16:44:31 -0800
From:   Mat Martineau <mathew.j.martineau@...ux.intel.com>
To:     netdev@...r.kernel.org
Cc:     Matthieu Baerts <matthieu.baerts@...sares.net>,
        davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com,
        edumazet@...gle.com, mptcp@...ts.linux.dev,
        kernel test robot <lkp@...el.com>,
        Dan Carpenter <error27@...il.com>,
        Mat Martineau <mathew.j.martineau@...ux.intel.com>
Subject: [PATCH net-next 2/2] mptcp: return 0 instead of 'err' var

From: Matthieu Baerts <matthieu.baerts@...sares.net>

When 'err' is 0, it looks clearer to return '0' instead of the variable
called 'err'.

The behaviour is then not modified, just a clearer code.

By doing this, we can also avoid false positive smatch warnings like
this one:

  net/mptcp/pm_netlink.c:1169 mptcp_pm_parse_pm_addr_attr() warn: missing error code? 'err'

Reported-by: kernel test robot <lkp@...el.com>
Reported-by: Dan Carpenter <error27@...il.com>
Suggested-by: Mat Martineau <mathew.j.martineau@...ux.intel.com>
Reviewed-by: Mat Martineau <mathew.j.martineau@...ux.intel.com>
Signed-off-by: Matthieu Baerts <matthieu.baerts@...sares.net>
Signed-off-by: Mat Martineau <mathew.j.martineau@...ux.intel.com>
---
 net/mptcp/pm_netlink.c | 4 ++--
 net/mptcp/sockopt.c    | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/net/mptcp/pm_netlink.c b/net/mptcp/pm_netlink.c
index 08c65f3e70a3..2ea7eae43bdb 100644
--- a/net/mptcp/pm_netlink.c
+++ b/net/mptcp/pm_netlink.c
@@ -1190,7 +1190,7 @@ static int mptcp_pm_parse_pm_addr_attr(struct nlattr *tb[],
 
 	if (!tb[MPTCP_PM_ADDR_ATTR_FAMILY]) {
 		if (!require_family)
-			return err;
+			return 0;
 
 		NL_SET_ERR_MSG_ATTR(info->extack, attr,
 				    "missing family");
@@ -1224,7 +1224,7 @@ static int mptcp_pm_parse_pm_addr_attr(struct nlattr *tb[],
 	if (tb[MPTCP_PM_ADDR_ATTR_PORT])
 		addr->port = htons(nla_get_u16(tb[MPTCP_PM_ADDR_ATTR_PORT]));
 
-	return err;
+	return 0;
 }
 
 int mptcp_pm_parse_addr(struct nlattr *attr, struct genl_info *info,
diff --git a/net/mptcp/sockopt.c b/net/mptcp/sockopt.c
index a47423ebb33a..d4b1e6ec1b36 100644
--- a/net/mptcp/sockopt.c
+++ b/net/mptcp/sockopt.c
@@ -740,7 +740,7 @@ static int mptcp_setsockopt_v4_set_tos(struct mptcp_sock *msk, int optname,
 	}
 	release_sock(sk);
 
-	return err;
+	return 0;
 }
 
 static int mptcp_setsockopt_v4(struct mptcp_sock *msk, int optname,
-- 
2.38.1