netdev - [PATCH v2 net-next 2/4] bonding: use rcu_access_pointer() in bonding_show_mii

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Message-Id: <1405432616-12414-3-git-send-email-edumazet@google.com>
Date:	Tue, 15 Jul 2014 06:56:54 -0700
From:	Eric Dumazet <edumazet@...gle.com>
To:	"David S. Miller" <davem@...emloft.net>
Cc:	netdev@...r.kernel.org, Jay Vosburgh <j.vosburgh@...il.com>,
	Veaceslav Falico <vfalico@...il.com>,
	Andy Gospodarek <andy@...yhouse.net>,
	Nikolay Aleksandrov <nikolay@...hat.com>,
	Mahesh Bandewar <maheshb@...gle.com>,
	Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH v2 net-next 2/4] bonding: use rcu_access_pointer() in bonding_show_mii_status()

curr_active_slave is rcu protected, and bonding_show_mii_status() only
wants to check if pointer is NULL or not.

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Acked-by: Veaceslav Falico <vfalico@...il.com>
Reviewed-by: Nikolay Aleksandrov <nikolay@...hat.com>
---
 drivers/net/bonding/bond_sysfs.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/bonding/bond_sysfs.c b/drivers/net/bonding/bond_sysfs.c
index daed52f68ce1..98db8edd9c75 100644
--- a/drivers/net/bonding/bond_sysfs.c
+++ b/drivers/net/bonding/bond_sysfs.c
@@ -492,8 +492,9 @@ static ssize_t bonding_show_mii_status(struct device *d,
 				       char *buf)
 {
 	struct bonding *bond = to_bond(d);
+	bool active = !!rcu_access_pointer(bond->curr_active_slave);
 
-	return sprintf(buf, "%s\n", bond->curr_active_slave ? "up" : "down");
+	return sprintf(buf, "%s\n", active ? "up" : "down");
 }
 static DEVICE_ATTR(mii_status, S_IRUGO, bonding_show_mii_status, NULL);
 
-- 
2.0.0.526.g5318336

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