netdev - [PATCH 1/2] Remove unnecessary locks from rtnetlink

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Message-Id: <12018820542721-git-send-email-panther@balabit.hu>
Date:	Fri,  1 Feb 2008 17:07:33 +0100
From:	Laszlo Attila Toth <panther@...abit.hu>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org, Laszlo Attila Toth <panther@...abit.hu>
Subject: [PATCH 1/2] Remove unnecessary locks from rtnetlink

The do_setlink() function is protected by rtnl, additional locks are unnecessary.
and the set_operstate() function is called from protected parts. Locks removed
from both functions.

The set_operstate() is also called from rtnl_create_link() and from no other places.
In rtnl_create_link() none of the changes is protected by set_lock_bh() except
inside set_operstate(), different locking scheme is not necessary
for the operstate.

Signed-off-by: Laszlo Attila Toth <panther@...abit.hu>
---
 net/core/rtnetlink.c |    4 ----
 1 files changed, 0 insertions(+), 4 deletions(-)

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index ddbdde8..724e8f5 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -565,9 +565,7 @@ static void set_operstate(struct net_device *dev, unsigned char transition)
 	}
 
 	if (dev->operstate != operstate) {
-		write_lock_bh(&dev_base_lock);
 		dev->operstate = operstate;
-		write_unlock_bh(&dev_base_lock);
 		netdev_state_change(dev);
 	}
 }
@@ -882,9 +880,7 @@ static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm,
 		set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
 
 	if (tb[IFLA_LINKMODE]) {
-		write_lock_bh(&dev_base_lock);
 		dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
-		write_unlock_bh(&dev_base_lock);
 	}
 
 	err = 0;
-- 
1.5.2.5

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