linux-kernel - [PATCH] sctp: consolidate local_bh_disable/enable + spin_lock/unlock to

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Message-Id: <1457866104-24342-1-git-send-email-hofrat@osadl.org>
Date:	Sun, 13 Mar 2016 11:48:24 +0100
From:	Nicholas Mc Guire <hofrat@...dl.org>
To:	Vlad Yasevich <vyasevich@...il.com>
Cc:	wangweidong <wangweidong1@...wei.com>,
	Neil Horman <nhorman@...driver.com>,
	"David S. Miller" <davem@...emloft.net>,
	linux-sctp@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, Nicholas Mc Guire <hofrat@...dl.org>
Subject: [PATCH] sctp: consolidate local_bh_disable/enable + spin_lock/unlock to _bh variant

local_bh_disable() + spin_lock() is equivalent to spin_lock_bh(), same for
the unlock/enable case, so replace the calls by the appropriate wrappers.

Signed-off-by: Nicholas Mc Guire <hofrat@...dl.org>
---

net-next 3c8e43ba "sctp: remove macros sctp_spin_[un]lock" and
net-next 79b91130 "sctp: remove macros sctp_local_bh_{disable|enable}"
reverted scpt macros back to spin_lock/unlock and local_bh_disable/enable
which can be consolidated to spin_lock_bh/spin_unlock_bh in this case.

Compile tested with: x86_64_defconfig + CONFIG_IP_SCTP=m

Patch is against linux-next (localversion-next is next-20160311)

 net/sctp/socket.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index b2dc8eb..f62feb0 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -7256,14 +7256,12 @@ static void sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
 	/* Hook this new socket in to the bind_hash list. */
 	head = &sctp_port_hashtable[sctp_phashfn(sock_net(oldsk),
 						 inet_sk(oldsk)->inet_num)];
-	local_bh_disable();
-	spin_lock(&head->lock);
+	spin_lock_bh(&head->lock);
 	pp = sctp_sk(oldsk)->bind_hash;
 	sk_add_bind_node(newsk, &pp->owner);
 	sctp_sk(newsk)->bind_hash = pp;
 	inet_sk(newsk)->inet_num = inet_sk(oldsk)->inet_num;
-	spin_unlock(&head->lock);
-	local_bh_enable();
+	spin_unlock_bh(&head->lock);
 
 	/* Copy the bind_addr list from the original endpoint to the new
 	 * endpoint so that we can handle restarts properly
-- 
2.1.4