netdev - [PATCH] macvlan: Don't propagate IFF_ALLMULTI changes on down interfaces.

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Message-Id: <1399540537-19262-1-git-send-email-pch@ordbogen.com>
Date:	Thu,  8 May 2014 11:15:37 +0200
From:	Peter Christensen <pch@...bogen.com>
To:	Patrick McHardy <kaber@...sh.net>
Cc:	netdev@...r.kernel.org, Peter Christensen <pch@...bogen.com>
Subject: [PATCH] macvlan: Don't propagate IFF_ALLMULTI changes on down interfaces.

Clearing the IFF_ALLMULTI flag on a down interface could cause an allmulti
overflow on the underlying interface.

Attempting the set IFF_ALLMULTI on the underlying interface would cause an
error and the log message:

"allmulti touches root, set allmulti failed."

Signed-off-by: Peter Christensen <pch@...bogen.com>
---
 drivers/net/macvlan.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c
index b0e2865..c5fb9cf 100644
--- a/drivers/net/macvlan.c
+++ b/drivers/net/macvlan.c
@@ -458,8 +458,10 @@ static void macvlan_change_rx_flags(struct net_device *dev, int change)
 	struct macvlan_dev *vlan = netdev_priv(dev);
 	struct net_device *lowerdev = vlan->lowerdev;

-	if (change & IFF_ALLMULTI)
-		dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
+	if (dev->flags & IFF_UP) {
+		if (change & IFF_ALLMULTI)
+			dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
+	}
 }

 static void macvlan_set_mac_lists(struct net_device *dev)
-- 
1.7.10.4

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