netdev - [PATCH 14/37] dccp: Tidy up setsockopt calls

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Date:	Thu, 28 Aug 2008 19:44:49 +0200
From:	Gerrit Renker <gerrit@....abdn.ac.uk>
To:	dccp@...r.kernel.org
Cc:	netdev@...r.kernel.org, Gerrit Renker <gerrit@....abdn.ac.uk>
Subject: [PATCH 14/37] dccp: Tidy up setsockopt calls

This splits the setsockopt calls into two groups, depending on whether an
integer argument (val) is required and whether routines being called do
their own locking.

Some options (such as setting the CCID) use u8 rather than int, so that for
these the test with regard to integer-sizeof can not be used.

The second switch-case statement now only has those statements which need
locking and which make use of `val'.

Signed-off-by: Gerrit Renker <gerrit@....abdn.ac.uk>
Acked-by: Ian McDonald <ian.mcdonald@...di.co.nz>
---
 net/dccp/proto.c |   31 ++++++++++++++++---------------
 1 files changed, 16 insertions(+), 15 deletions(-)

--- a/net/dccp/proto.c
+++ b/net/dccp/proto.c
@@ -511,26 +511,27 @@ static int do_dccp_setsockopt(struct sock *sk, int level, int optname,
 	struct dccp_sock *dp = dccp_sk(sk);
 	int val, err = 0;
 
-	if (optlen < sizeof(int))
-		return -EINVAL;
-
-	if (get_user(val, (int __user *)optval))
-		return -EFAULT;
-
-	if (optname == DCCP_SOCKOPT_SERVICE)
-		return dccp_setsockopt_service(sk, val, optval, optlen);
-
-	lock_sock(sk);
 	switch (optname) {
 	case DCCP_SOCKOPT_PACKET_SIZE:
 		DCCP_WARN("sockopt(PACKET_SIZE) is deprecated: fix your app\n");
-		err = 0;
-		break;
+		return 0;
 	case DCCP_SOCKOPT_CHANGE_L:
 	case DCCP_SOCKOPT_CHANGE_R:
 		DCCP_WARN("sockopt(CHANGE_L/R) is deprecated: fix your app\n");
-		err = 0;
-		break;
+		return 0;
+	default:
+		if (optlen < sizeof(int))
+			return -EINVAL;
+
+		if (get_user(val, (int __user *)optval))
+			return -EFAULT;
+
+		if (optname == DCCP_SOCKOPT_SERVICE)
+			return dccp_setsockopt_service(sk, val, optval, optlen);
+	}
+
+	lock_sock(sk);
+	switch (optname) {
 	case DCCP_SOCKOPT_SERVER_TIMEWAIT:
 		if (dp->dccps_role != DCCP_ROLE_SERVER)
 			err = -EOPNOTSUPP;
@@ -547,8 +548,8 @@ static int do_dccp_setsockopt(struct sock *sk, int level, int optname,
 		err = -ENOPROTOOPT;
 		break;
 	}
-
 	release_sock(sk);
+
 	return err;
 }
 
-- 
1.6.0.rc2

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