Subject: Re: [PATCH] flexcan: Acknowledge all interrupt sources in the IRQ handler

From: Marc Kleine-Budde <[email-masked]>
Date: Fri, 09 Dec 2011 14:52:46 +0100

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 <[email-masked]>
> ---
>  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:

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