netdev - ixgbe: replace rtnl_lock with rcu_read

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Date:	Sun,  5 Jun 2016 17:14:50 +0800
From:	zyjzyj2000@...il.com
To:	e1000-devel@...ts.sourceforge.net, netdev@...r.kernel.org
Subject: ixgbe: replace rtnl_lock with rcu_read_lock 

Hi,all

 I am using the ixgbe nic. I found that the rtnl_lock is being 
 used to enable upper device, such as macvlan. I am curious
 why rcu_read_lock is not used here.

 I replaced rtnl_lock with rcu_read_lock here. Then I made tests and
 it can work well.

 So can the rtnl_lock be replaced with rcu_read_lock?
 Anyone can explain it in details?

 Any reply is appreciated.
 Zhu Yanjun