netdev - [PATCH v3 13/14] net: bonding: Remove redundant rcu_read_lock/unlock() in spin

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Message-Id: <20250916044735.2316171-14-dolinux.peng@gmail.com>
Date: Tue, 16 Sep 2025 12:47:34 +0800
From: pengdonglin <dolinux.peng@...il.com>
To: tj@...nel.org,
	tony.luck@...el.com,
	jani.nikula@...ux.intel.com,
	ap420073@...il.com,
	jv@...sburgh.net,
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	kees@...nel.org
Cc: bigeasy@...utronix.de,
	hdanton@...a.com,
	paulmck@...nel.org,
	linux-kernel@...r.kernel.org,
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	linux-aio@...ck.org,
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	linux-s390@...r.kernel.org,
	cgroups@...r.kernel.org,
	pengdonglin <dolinux.peng@...il.com>,
	Paolo Abeni <pabeni@...hat.com>,
	Jakub Kicinski <kuba@...nel.org>,
	pengdonglin <pengdonglin@...omi.com>
Subject: [PATCH v3 13/14] net: bonding: Remove redundant rcu_read_lock/unlock() in spin_lock

From: pengdonglin <pengdonglin@...omi.com>

Since commit a8bb74acd8efe ("rcu: Consolidate RCU-sched update-side function definitions")
there is no difference between rcu_read_lock(), rcu_read_lock_bh() and
rcu_read_lock_sched() in terms of RCU read section and the relevant grace
period. That means that spin_lock(), which implies rcu_read_lock_sched(),
also implies rcu_read_lock().

There is no need no explicitly start a RCU read section if one has already
been started implicitly by spin_lock().

Simplify the code and remove the inner rcu_read_lock() invocation.

Cc: Jay Vosburgh <jv@...sburgh.net>
Cc: Paolo Abeni <pabeni@...hat.com>
Cc: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: pengdonglin <pengdonglin@...omi.com>
Signed-off-by: pengdonglin <dolinux.peng@...il.com>
---
 drivers/net/bonding/bond_3ad.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/net/bonding/bond_3ad.c b/drivers/net/bonding/bond_3ad.c
index 4edc8e6b6b64..c53ea73f103a 100644
--- a/drivers/net/bonding/bond_3ad.c
+++ b/drivers/net/bonding/bond_3ad.c
@@ -2485,7 +2485,6 @@ void bond_3ad_state_machine_handler(struct work_struct *work)
 	 * concurrently due to incoming LACPDU as well.
 	 */
 	spin_lock_bh(&bond->mode_lock);
-	rcu_read_lock();
 
 	/* check if there are any slaves */
 	if (!bond_has_slaves(bond))
@@ -2537,7 +2536,6 @@ void bond_3ad_state_machine_handler(struct work_struct *work)
 			break;
 		}
 	}
-	rcu_read_unlock();
 	spin_unlock_bh(&bond->mode_lock);
 
 	if (update_slave_arr)
-- 
2.34.1