netdev - [PATCH v5 net-next 01/12] bonding: remove bond->lock from bond_arp

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Message-Id: <1392706127-28390-2-git-send-email-vfalico@redhat.com>
Date:	Tue, 18 Feb 2014 07:48:36 +0100
From:	Veaceslav Falico <vfalico@...hat.com>
To:	netdev@...r.kernel.org
Cc:	Veaceslav Falico <vfalico@...hat.com>,
	Jay Vosburgh <fubar@...ibm.com>,
	Andy Gospodarek <andy@...yhouse.net>
Subject: [PATCH v5 net-next 01/12] bonding: remove bond->lock from bond_arp_rcv

We're always called with rcu_read_lock() held (bond_arp_rcv() is only
called from bond_handle_frame(), which is rx_handler and always called
under rcu from __netif_receive_skb_core() ).

The slave active/passive and/or bonding params can change in-flight, however
we don't really care about that - we only modify the last time packet was
received, which is harmless.

CC: Jay Vosburgh <fubar@...ibm.com>
CC: Andy Gospodarek <andy@...yhouse.net>
Signed-off-by: Veaceslav Falico <vfalico@...hat.com>
---
 drivers/net/bonding/bond_main.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 3bce855..3c50bec 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -2260,8 +2260,6 @@ int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
 	if (skb->protocol != __cpu_to_be16(ETH_P_ARP))
 		return RX_HANDLER_ANOTHER;
 
-	read_lock(&bond->lock);
-
 	if (!slave_do_arp_validate(bond, slave))
 		goto out_unlock;
 
@@ -2318,7 +2316,6 @@ int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
 		bond_validate_arp(bond, slave, tip, sip);
 
 out_unlock:
-	read_unlock(&bond->lock);
 	if (arp != (struct arphdr *)skb->data)
 		kfree(arp);
 	return RX_HANDLER_ANOTHER;
-- 
1.8.4

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