netdev - [PATCH v2 3/3] kernel/notifier.c: remove blocking_notifier_chain_cond

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Date:   Thu, 20 Jun 2019 20:48:34 +0800
From:   Xiaoming Ni <nixiaoming@...wei.com>
To:     <trond.myklebust@...merspace.com>, <anna.schumaker@...app.com>,
        <bfields@...ldses.org>, <jlayton@...nel.org>,
        <davem@...emloft.net>, <semen.protsenko@...aro.org>,
        <akpm@...ux-foundation.org>, <gregkh@...uxfoundation.org>,
        <vvs@...tuozzo.com>, <tglx@...utronix.de>
CC:     <nixiaoming@...wei.com>, <dylix.dailei@...wei.com>,
        <alex.huangjianhui@...wei.com>, <adobriyan@...il.com>,
        <mingo@...nel.org>, <viresh.kumar@...aro.org>, <luto@...nel.org>,
        <arjan@...ux.intel.com>, <Nadia.Derbey@...l.net>,
        <torvalds@...ux-foundation.org>, <stern@...land.harvard.edu>,
        <paulmck@...ux.vnet.ibm.com>, <linux-kernel@...r.kernel.org>,
        <linux-nfs@...r.kernel.org>, <netdev@...r.kernel.org>,
        <stable@...nel.org>
Subject: [PATCH v2 3/3] kernel/notifier.c: remove blocking_notifier_chain_cond_register()

blocking_notifier_chain_cond_register() does not consider
system_booting state, which is the only difference between this
function and blocking_notifier_cain_register(). This can be a bug
and is a piece of duplicate code.

Delete blocking_notifier_chain_cond_register()

Signed-off-by: Xiaoming Ni <nixiaoming@...wei.com>
---
 include/linux/notifier.h |  4 ----
 kernel/notifier.c        | 23 -----------------------
 net/sunrpc/rpc_pipe.c    |  2 +-
 3 files changed, 1 insertion(+), 28 deletions(-)

diff --git a/include/linux/notifier.h b/include/linux/notifier.h
index 0096a05..0189476 100644
--- a/include/linux/notifier.h
+++ b/include/linux/notifier.h
@@ -150,10 +150,6 @@ extern int raw_notifier_chain_register(struct raw_notifier_head *nh,
 extern int srcu_notifier_chain_register(struct srcu_notifier_head *nh,
 		struct notifier_block *nb);
 
-extern int blocking_notifier_chain_cond_register(
-		struct blocking_notifier_head *nh,
-		struct notifier_block *nb);
-
 extern int atomic_notifier_chain_unregister(struct atomic_notifier_head *nh,
 		struct notifier_block *nb);
 extern int blocking_notifier_chain_unregister(struct blocking_notifier_head *nh,
diff --git a/kernel/notifier.c b/kernel/notifier.c
index e3d221f..63d7501 100644
--- a/kernel/notifier.c
+++ b/kernel/notifier.c
@@ -221,29 +221,6 @@ int blocking_notifier_chain_register(struct blocking_notifier_head *nh,
 EXPORT_SYMBOL_GPL(blocking_notifier_chain_register);
 
 /**
- *	blocking_notifier_chain_cond_register - Cond add notifier to a blocking notifier chain
- *	@nh: Pointer to head of the blocking notifier chain
- *	@n: New entry in notifier chain
- *
- *	Adds a notifier to a blocking notifier chain, only if not already
- *	present in the chain.
- *	Must be called in process context.
- *
- *	Currently always returns zero.
- */
-int blocking_notifier_chain_cond_register(struct blocking_notifier_head *nh,
-		struct notifier_block *n)
-{
-	int ret;
-
-	down_write(&nh->rwsem);
-	ret = notifier_chain_register(&nh->head, n);
-	up_write(&nh->rwsem);
-	return ret;
-}
-EXPORT_SYMBOL_GPL(blocking_notifier_chain_cond_register);
-
-/**
  *	blocking_notifier_chain_unregister - Remove notifier from a blocking notifier chain
  *	@nh: Pointer to head of the blocking notifier chain
  *	@n: Entry to remove from notifier chain
diff --git a/net/sunrpc/rpc_pipe.c b/net/sunrpc/rpc_pipe.c
index 126d314..1287f80 100644
--- a/net/sunrpc/rpc_pipe.c
+++ b/net/sunrpc/rpc_pipe.c
@@ -50,7 +50,7 @@
 
 int rpc_pipefs_notifier_register(struct notifier_block *nb)
 {
-	return blocking_notifier_chain_cond_register(&rpc_pipefs_notifier_list, nb);
+	return blocking_notifier_chain_register(&rpc_pipefs_notifier_list, nb);
 }
 EXPORT_SYMBOL_GPL(rpc_pipefs_notifier_register);
 
-- 
1.8.5.6