linux-kernel - Re: [PATCH tip/core/rcu 28/48] net: Make accesses to ->br

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Message-Id: <201005042341.49480.arnd@arndb.de>
Date:	Tue, 4 May 2010 23:41:49 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Stephen Hemminger <shemminger@...ux-foundation.org>
Cc:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org, mingo@...e.hu, laijs@...fujitsu.com,
	dipankar@...ibm.com, akpm@...ux-foundation.org,
	mathieu.desnoyers@...ymtl.ca, josh@...htriplett.org,
	dvhltc@...ibm.com, niv@...ibm.com, tglx@...utronix.de,
	peterz@...radead.org, rostedt@...dmis.org, Valdis.Kletnieks@...edu,
	dhowells@...hat.com, eric.dumazet@...il.com,
	David Miller <davem@...emloft.net>
Subject: Re: [PATCH tip/core/rcu 28/48] net: Make accesses to ->br_port safe for sparse RCU

On Tuesday 04 May 2010 23:26:31 Stephen Hemminger wrote:
> > The new versions of the rcu_dereference() APIs requires that any pointers
> > passed to one of these APIs be fully defined.  The ->br_port field
> > in struct net_device points to a struct net_bridge_port, which is an
> > incomplete type.  This commit therefore changes ->br_port to be a void*,
> > and introduces a br_port() helper function to convert the type to struct
> > net_bridge_port, and applies this new helper function where required.
> > 
> 
> I would rather make the bridge hook generic and not take a type argument.

Not sure if you were confused by the comment in the same way that I was.

The bridge hook is not impacted by this at all, since we can either pass
a void* or a struct net_bridge_port* to it. The br_port() helper
is used for all the places where we actually want to dereference 
dev->br_port and access its contents.

	Arnd
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