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Date:	Thu, 23 May 2013 09:57:55 +0800
From:	dingtianhong <>
To:	Jay Vosburgh <>,
	Andy Gospodarek <>,
	"David S. Miller" <>,
	Eric Dumazet <>,
	Netdev <>, Li Zefan <>
Subject: [PATCH] bonding: add synchronize_net() after netdev_rx_handler_unregister

commit 00cfec3 (net: add a synchronize_net() in netdev_rx_handler_unregister())
add a synchronize_net() in netdev_rx_handler_unregister() to guarantee the
rx_handler is NULL when rx_handler_data is a non NULL in rcu_read_lock().

so the caller should not use netdev_rx_handler_unregister in atomic as it may
schedule and sleep, the bonding release met the problem.

the commit fcd99434f (bonding: get netdev_rx_handler_unregister out of locks)
fix the bug in bond release, but there is no action to guarantee the
rx_handler_data is NULL when bond release, so add synchronize_net() behind
netdev_rx_handler_unregister() to guarantee it.

This patch adds more comments to netdev_rx_handler_unregister(), as its more

Signed-off-by: Ding Tianhong <>
 drivers/net/bonding/bond_main.c | 2 ++
 net/core/dev.c                  | 3 +++
 2 files changed, 5 insertions(+)

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index d0aade0..592a603 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -2007,6 +2007,8 @@ static int __bond_release_one(struct net_device *bond_dev,
 	 * for this slave anymore.
+	synchronize_net();
 	if (!all && !bond->params.fail_over_mac) {
diff --git a/net/core/dev.c b/net/core/dev.c
index fc1e289..9ffeda9 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -3344,6 +3344,9 @@ EXPORT_SYMBOL_GPL(netdev_rx_handler_register);
  *	Unregister a receive handler from a device.
  *	The caller must hold the rtnl_mutex.
+ *
+ *	The function should only be called outside the atomic as it
+ *	might sleep and schedule.
 void netdev_rx_handler_unregister(struct net_device *dev)

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