linux-kernel - Re: [PATCH] flexcan: Acknowledge all interrupt sources in the IRQ handler

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Date:	Fri, 9 Dec 2011 14:59:54 +0100
From:	Lothar Waßmann <LW@...O-electronics.de>
To:	Marc Kleine-Budde <mkl@...gutronix.de>
Cc:	Wolfgang Grandegger <wg@...ndegger.com>, linux-can@...r.kernel.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] flexcan: Acknowledge all interrupt sources in the IRQ
 handler

Hi,

Marc Kleine-Budde writes:
> On 12/09/2011 02:47 PM, Lothar Waßmann wrote:
> > Otherwise the handler will get stuck in an endless IRQ loop when an
> > interrupt condition occurs that is not being acked (e.g. TWRN)
> 
> On which CPU do you have this problem?
> 
on i.MX28.

> Seems that mx25/35 behave a bit different than mx28. But I had no time
> to dig into this, yet. BTW Wolfgang is just reworking error handling,
> can you please test his patches he recently posted on linux-can.
> 
The ESR of i.MX25 is completely identical to the i.MX28.
You should be able to reproduce the problem when trying to send a
message to a CAN interface with the transceiver disabled.
You will get a BIT0_ERR and the TWRN bit will be asserted and never
cleared leading to an endless interrupt loop.


Lothar Waßmann
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