netdev - [PATCH net-next 2/4] rtnl/do_setlink(): set modified when IFLA

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Message-Id: <1409580449-4562-3-git-send-email-nicolas.dichtel@6wind.com>
Date:	Mon,  1 Sep 2014 16:07:27 +0200
From:	Nicolas Dichtel <nicolas.dichtel@...nd.com>
To:	netdev@...r.kernel.org
Cc:	davem@...emloft.net, Nicolas Dichtel <nicolas.dichtel@...nd.com>
Subject: [PATCH net-next 2/4] rtnl/do_setlink(): set modified when IFLA_LINKMODE is updated

The only effect of this patch is to print a warning if IFLA_LINKMODE is updated
and a following change fails.

Signed-off-by: Nicolas Dichtel <nicolas.dichtel@...nd.com>
---
 net/core/rtnetlink.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 5bbaf74bf457..2bd9fb15b987 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -1624,8 +1624,12 @@ static int do_setlink(const struct sk_buff *skb,
 		set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
 
 	if (tb[IFLA_LINKMODE]) {
+		unsigned char value = nla_get_u8(tb[IFLA_LINKMODE]);
+
 		write_lock_bh(&dev_base_lock);
-		dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
+		if (dev->link_mode ^ value)
+			modified = 1;
+		dev->link_mode = value;
 		write_unlock_bh(&dev_base_lock);
 	}
 
-- 
1.9.0

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