From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ying Xue Subject: [PATCH net-next v2 06/10] vxlan: use __dev_get_by_index instead of dev_get_by_index to find interface Date: Wed, 15 Jan 2014 10:23:41 +0800 Message-ID: <1389752625-23189-7-git-send-email-ying.xue@windriver.com> References: <1389752625-23189-1-git-send-email-ying.xue@windriver.com> Mime-Version: 1.0 Content-Type: text/plain Cc: , , , , , , , , To: Return-path: In-Reply-To: <1389752625-23189-1-git-send-email-ying.xue@windriver.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: netdev.vger.kernel.org The following call chains indicate that vxlan_fdb_parse() is under rtnl_lock protection. So if we use __dev_get_by_index() instead of dev_get_by_index() to find interface handler in it, this would help us avoid to change interface reference counter. rtnetlink_rcv() rtnl_lock() netlink_rcv_skb() rtnl_fdb_add() vxlan_fdb_add() vxlan_fdb_parse() rtnl_unlock() rtnetlink_rcv() rtnl_lock() netlink_rcv_skb() rtnl_fdb_del() vxlan_fdb_del() vxlan_fdb_parse() rtnl_unlock() Cc: Stephen Hemminger Signed-off-by: Ying Xue Acked-by: Stephen Hemminger --- drivers/net/vxlan.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c index 481f85d..8c40802 100644 --- a/drivers/net/vxlan.c +++ b/drivers/net/vxlan.c @@ -741,10 +741,9 @@ static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan, if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32)) return -EINVAL; *ifindex = nla_get_u32(tb[NDA_IFINDEX]); - tdev = dev_get_by_index(net, *ifindex); + tdev = __dev_get_by_index(net, *ifindex); if (!tdev) return -EADDRNOTAVAIL; - dev_put(tdev); } else { *ifindex = 0; } -- 1.7.9.5