From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ding Tianhong Subject: [PATCH net-next v2 5/10] net: add and export netdev_adjacent_get_private_rcu() Date: Fri, 8 Nov 2013 10:08:00 +0800 Message-ID: <527C4780.7010408@huawei.com> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit To: Jay Vosburgh , Andy Gospodarek , "David S. Miller" , Nikolay Aleksandrov , Veaceslav Falico , Netdev Return-path: Received: from szxga01-in.huawei.com ([119.145.14.64]:42060 "EHLO szxga01-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757308Ab3KHC3K (ORCPT ); Thu, 7 Nov 2013 21:29:10 -0500 Sender: netdev-owner@vger.kernel.org List-ID: In bonding, the bond lock could not protect slave list any more, the bond lock will be replace with RTNL or RCU, sometimes bonding needs netdev_adjacent_get_private_rcu() to get a slave in RCU protect, so add a new function and export it. Suggested-by: Jay Vosburgh Suggested-by: Veaceslav Falico Signed-off-by: Ding Tianhong --- include/linux/netdevice.h | 1 + net/core/dev.c | 10 ++++++++++ 2 files changed, 11 insertions(+) diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index e6353ca..c27bb4a 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -2840,6 +2840,7 @@ void *netdev_lower_get_next_private_rcu(struct net_device *dev, priv = netdev_lower_get_next_private_rcu(dev, &(iter))) void *netdev_adjacent_get_private(struct list_head *adj_list); +void *netdev_adjacent_get_private_rcu(struct list_head *adj_list); struct net_device *netdev_master_upper_dev_get(struct net_device *dev); struct net_device *netdev_master_upper_dev_get_rcu(struct net_device *dev); int netdev_upper_dev_link(struct net_device *dev, struct net_device *upper_dev); diff --git a/net/core/dev.c b/net/core/dev.c index 0e61365..92613a2 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -4478,6 +4478,16 @@ void *netdev_adjacent_get_private(struct list_head *adj_list) } EXPORT_SYMBOL(netdev_adjacent_get_private); +void *netdev_adjacent_get_private_rcu(struct list_head *adj_list) +{ + struct netdev_adjacent *adj; + + adj = list_entry_rcu(adj_list, struct netdev_adjacent, list); + + return adj->private; +} +EXPORT_SYMBOL(netdev_adjacent_get_private_rcu); + /** * netdev_all_upper_get_next_dev_rcu - Get the next dev from upper list * @dev: device -- 1.8.2.1