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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20194.5210.650914.867608@ipc1.ka-ro>
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
-- 
___________________________________________________________

Ka-Ro electronics GmbH | Pascalstraße 22 | D - 52076 Aachen
Phone: +49 2408 1402-0 | Fax: +49 2408 1402-10
Geschäftsführer: Matthias Kaussen
Handelsregistereintrag: Amtsgericht Aachen, HRB 4996

www.karo-electronics.de | info@...o-electronics.de
___________________________________________________________
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/