netdev - [patch net-next 1/4] net: introduce new priv_flag indicating iface capable of change mac when running

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Date:	Thu, 28 Jun 2012 16:10:36 +0200
From:	Jiri Pirko <jpirko@...hat.com>
To:	netdev@...r.kernel.org
Cc:	davem@...emloft.net, rusty@...tcorp.com.au, mst@...hat.com,
	virtualization@...ts.linux-foundation.org, edumazet@...gle.com,
	danny.kukawka@...ect.de, shimoda.hiroaki@...il.com
Subject: [patch net-next 1/4] net: introduce new priv_flag indicating iface capable of change mac when running

Introduce IFF_LIFE_ADDR_CHANGE priv_flag and use it to disable
netif_running() check in eth_mac_addr()

Signed-off-by: Jiri Pirko <jpirko@...hat.com>
---
 include/linux/if.h |    2 ++
 net/ethernet/eth.c |    2 +-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/include/linux/if.h b/include/linux/if.h
index f995c66..fd9ee7c 100644
--- a/include/linux/if.h
+++ b/include/linux/if.h
@@ -81,6 +81,8 @@
 #define IFF_UNICAST_FLT	0x20000		/* Supports unicast filtering	*/
 #define IFF_TEAM_PORT	0x40000		/* device used as team port */
 #define IFF_SUPP_NOFCS	0x80000		/* device supports sending custom FCS */
+#define IFF_LIFE_ADDR_CHANGE 0x100000	/* device supports hardware address
+					 * change when it's running */
 
 
 #define IF_GET_IFACE	0x0001		/* for querying only */
diff --git a/net/ethernet/eth.c b/net/ethernet/eth.c
index 36e5880..8f8ded4 100644
--- a/net/ethernet/eth.c
+++ b/net/ethernet/eth.c
@@ -283,7 +283,7 @@ int eth_mac_addr(struct net_device *dev, void *p)
 {
 	struct sockaddr *addr = p;
 
-	if (netif_running(dev))
+	if (!(dev->priv_flags & IFF_LIFE_ADDR_CHANGE) && netif_running(dev))
 		return -EBUSY;
 	if (!is_valid_ether_addr(addr->sa_data))
 		return -EADDRNOTAVAIL;
-- 
1.7.10.4

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