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: <4EE212AE.40005@pengutronix.de>
Date:	Fri, 09 Dec 2011 14:52:46 +0100
From:	Marc Kleine-Budde <mkl@...gutronix.de>
To:	Lothar Waßmann <LW@...O-electronics.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

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?

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.

cheers, Marc


> Signed-off-by: Lothar Waßmann <LW@...O-electronics.de>
> ---
>  drivers/net/can/flexcan.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c
> index e023379..ea8f04d 100644
> --- a/drivers/net/can/flexcan.c
> +++ b/drivers/net/can/flexcan.c
> @@ -577,7 +577,7 @@ static irqreturn_t flexcan_irq(int irq, void *dev_id)
>  
>  	reg_iflag1 = flexcan_read(&regs->iflag1);
>  	reg_esr = flexcan_read(&regs->esr);
> -	flexcan_write(FLEXCAN_ESR_ERR_INT, &regs->esr);	/* ACK err IRQ */
> +	flexcan_write(reg_esr, &regs->esr);	/* ACK all IRQs */
>  
>  	/*
>  	 * schedule NAPI in case of:


-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
Industrial Linux Solutions        | Phone: +49-231-2826-924     |
Vertretung West/Dortmund          | Fax:   +49-5121-206917-5555 |
Amtsgericht Hildesheim, HRA 2686  | http://www.pengutronix.de   |


Download attachment "signature.asc" of type "application/pgp-signature" (263 bytes)