netdev - Re: [RFC PATCH bridge 4/5] bridge: Add private ioctls to configure vlans on bridge ports

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Date:	Fri, 24 Aug 2012 11:11:13 -0700
From:	Stephen Hemminger <shemminger@...tta.com>
To:	paulmck@...ux.vnet.ibm.com
Cc:	Vlad Yasevich <vyasevic@...hat.com>, netdev@...r.kernel.org
Subject: Re: [RFC PATCH bridge 4/5] bridge: Add private ioctls to configure
 vlans on bridge ports

On Fri, 24 Aug 2012 10:56:16 -0700
"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> wrote:

> > +			return -EPERM;
> > +
> > +		rcu_read_lock();
> > +		if ((p = br_get_port(br, args[1])) == NULL) {
> > +			rcu_read_unlock();
> > +			return -EINVAL;
> > +		}
> > +		rcu_read_unlock();  
> 
> Why is it safe to pass "p" out of the RCU read-side critical section?
> I don't see that br_get_port() does anything to make this safe, at least
> not in v3.5.

It would be accidentally protected by rtnl?
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