netdev - Re: [patch 03/12] can: c

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Message-ID: <alpine.DEB.2.02.1403182037580.18573@ionos.tec.linutronix.de>
Date:	Tue, 18 Mar 2014 20:40:10 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Marc Kleine-Budde <mkl@...gutronix.de>
cc:	LKML <linux-kernel@...r.kernel.org>,
	Wolfgang Grandegger <wg@...ndegger.com>,
	Markus Pargmann <mpa@...gutronix.de>,
	Benedikt Spranger <b.spranger@...utronix.de>,
	linux-can@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [patch 03/12] can: c_can: Make it SMP safe

On Tue, 18 Mar 2014, Marc Kleine-Budde wrote:

> On 03/18/2014 06:19 PM, Thomas Gleixner wrote:
> > The hardware has two message control interfaces, but the code only
> > uses the first one. So on SMP the following can be observed:
> > 
> > CPU0 	       	CPU1
> > rx_poll()
> >   write IF1	xmit()
> > 		write IF1
> >   write IF1			
> > 
> > That results in corrupted message object configurations. The TX/RX is
> > not globally serialized it's only serialized on a core.
> > 
> > Simple solution: Let RX use IF1 and TX use IF2 and all is good.
> 
> Do both c_can and d_can have two control interfaces?

According to the manual it has.

Thanks,

	tglx
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