From patchwork Mon Aug 26 20:32:34 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Veaceslav Falico X-Patchwork-Id: 269967 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id E478E2C0082 for ; Tue, 27 Aug 2013 06:32:39 +1000 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752456Ab3HZUcg (ORCPT ); Mon, 26 Aug 2013 16:32:36 -0400 Received: from mx1.redhat.com ([209.132.183.28]:47765 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752425Ab3HZUcd (ORCPT ); Mon, 26 Aug 2013 16:32:33 -0400 Received: from int-mx09.intmail.prod.int.phx2.redhat.com (int-mx09.intmail.prod.int.phx2.redhat.com [10.5.11.22]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id r7QKWOUr024352 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Mon, 26 Aug 2013 16:32:24 -0400 Received: from darkmag.usersys.redhat.com (dhcp-27-102.brq.redhat.com [10.34.27.102]) by int-mx09.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id r7QKWJ4v028999; Mon, 26 Aug 2013 16:32:22 -0400 From: Veaceslav Falico To: netdev@vger.kernel.org Cc: Veaceslav Falico , "David S. Miller" , Eric Dumazet , Jiri Pirko , Alexander Duyck , Cong Wang Subject: [PATCH net-next v1 1/9] net: add netdev_upper_get_next_dev(dev, iter) Date: Mon, 26 Aug 2013 22:32:34 +0200 Message-Id: <1377549162-7522-2-git-send-email-vfalico@redhat.com> In-Reply-To: <1377549162-7522-1-git-send-email-vfalico@redhat.com> References: <1377549162-7522-1-git-send-email-vfalico@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.22 Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org This function returns the next dev in the dev->upper_dev_list after the struct list_head **iter position, and updates *iter accordingly. Returns NULL if there are no devices left. v1: new patch CC: "David S. Miller" CC: Eric Dumazet CC: Jiri Pirko CC: Alexander Duyck CC: Cong Wang Signed-off-by: Veaceslav Falico --- net/core/dev.c | 25 +++++++++++++++++++++++++ 1 files changed, 25 insertions(+), 0 deletions(-) diff --git a/net/core/dev.c b/net/core/dev.c index 1ed2b66..566e99a 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -4477,6 +4477,31 @@ struct net_device *netdev_master_upper_dev_get(struct net_device *dev) } EXPORT_SYMBOL(netdev_master_upper_dev_get); +/* netdev_upper_get_next_dev - Get the next dev from upper list + * @dev: device + * @iter: list_head ** of the current position + * + * Gets the next device from the dev's upper list, starting from iter + * position. The caller must hold RCU read lock. + */ +struct net_device *netdev_upper_get_next_dev(struct net_device *dev, + struct list_head **iter) +{ + struct netdev_upper *upper; + + WARN_ON_ONCE(!rcu_read_lock_held()); + + upper = list_entry_rcu((*iter)->next, struct netdev_upper, list); + + if (&upper->list == &dev->upper_dev_list) + return NULL; + + *iter = &upper->list; + + return upper->dev; +} +EXPORT_SYMBOL(netdev_upper_get_next_dev); + /** * netdev_master_upper_dev_get_rcu - Get master upper device * @dev: device