netdev - [PATCHv7 2/5] rtnetlink: send a single notification on device state changes

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Message-Id: <1196352710402-git-send-email-panther@balabit.hu>
Date:	Thu, 29 Nov 2007 17:11:43 +0100
From:	Laszlo Attila Toth <panther@...abit.hu>
To:	David Miller <davem@...emloft.net>
Cc:	Patrick McHardy <kaber@...sh.net>, netdev@...r.kernel.org,
	Laszlo Attila Toth <panther@...abit.hu>
Subject: [PATCHv7 2/5] rtnetlink: send a single notification on device state changes

In do_setlink() a single ntification is sent at the end of the function
if any modification occured. If the address has been changed, another
notification is sent.

Signed-off-by: Laszlo Attila Toth <panther@...abit.hu>
---

 net/core/rtnetlink.c |   27 ++++++++++++++++++++-------
 1 files changed, 20 insertions(+), 7 deletions(-)

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index f95c6c5..6be8608 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -542,7 +542,7 @@ int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
 
 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
 
-static void set_operstate(struct net_device *dev, unsigned char transition)
+static int set_operstate(struct net_device *dev, unsigned char transition)
 {
 	unsigned char operstate = dev->operstate;
 
@@ -563,8 +563,9 @@ static void set_operstate(struct net_device *dev, unsigned char transition)
 
 	if (dev->operstate != operstate) {
 		dev->operstate = operstate;
-		netdev_state_change(dev);
-	}
+		return 1;
+	} else
+		return 0;
 }
 
 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
@@ -858,6 +859,7 @@ static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm,
 	if (tb[IFLA_BROADCAST]) {
 		nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
 		send_addr_notify = 1;
+		modified = 1;
 	}
 
 	if (ifm->ifi_flags || ifm->ifi_change) {
@@ -870,14 +872,21 @@ static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm,
 		dev_change_flags(dev, flags);
 	}
 
-	if (tb[IFLA_TXQLEN])
-		dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
+	if (tb[IFLA_TXQLEN]) {
+		if (dev->tx_queue_len != nla_get_u32(tb[IFLA_TXQLEN])) {
+			dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
+			modified = 1;
+		}
+	}
 
 	if (tb[IFLA_OPERSTATE])
-		set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
+		modified |= set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
 
 	if (tb[IFLA_LINKMODE]) {
-		dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
+		if (dev->link_mode != nla_get_u8(tb[IFLA_LINKMODE])) {
+			dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
+			modified = 1;
+		} 
 	}
 
 	err = 0;
@@ -891,6 +900,10 @@ errout:
 
 	if (send_addr_notify)
 		call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
+
+	if (modified)
+		netdev_state_change(dev);
+
 	return err;
 }
 
-
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