linux-kernel - Re: Mark IPW2100 as BROKEN: Fatal interrupt. Scheduling firmware restart.

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Message-ID: <20080921124332.67ddc13a@infradead.org>
Date:	Sun, 21 Sep 2008 12:43:32 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Evgeniy Polyakov <johnpol@....mipt.ru>
Cc:	Johannes Berg <johannes@...solutions.net>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, ipw2100-devel@...ts.sourceforge.net,
	linux-wireless@...r.kernel.org, yi.zhu@...el.com,
	reinette.chatre@...el.com, jgarzik@...ox.com,
	linville@...driver.com, davem@...emloft.net
Subject: Re: Mark IPW2100 as BROKEN: Fatal interrupt. Scheduling firmware
 restart.

On Sun, 21 Sep 2008 23:38:09 +0400
Evgeniy Polyakov <johnpol@....mipt.ru> wrote:

> 
> As I pointed, I can rewrite the whole driver's initialization process,
> so that it looked like init/wait/exit loop, which can be processed at
> the module load and when fatal interrupt fires. 

yes please do this.

> 
> I do hope this will result in a progress. Arjan, do you aggree to add
> this patch to the current tree?
> 
> diff --git a/drivers/net/wireless/ipw2100.c
> b/drivers/net/wireless/ipw2100.c index 19a401c..9a7b64c 100644
> --- a/drivers/net/wireless/ipw2100.c
> +++ b/drivers/net/wireless/ipw2100.c
> @@ -206,6 +206,8 @@ MODULE_PARM_DESC(disable, "manually disable the
> radio (default 0 [radio on])"); 
>  static u32 ipw2100_debug_level = IPW_DL_NONE;
>  
> +static int ipw2100_max_fatal_ints = 10;
> +
>  #ifdef CONFIG_IPW2100_DEBUG
>  #define IPW_DEBUG(level, message...) \
>  do { \
> @@ -3174,6 +3176,10 @@ static void ipw2100_irq_tasklet(struct
> ipw2100_priv *priv) if (inta & IPW2100_INTA_FATAL_ERROR) {
>  		printk(KERN_WARNING DRV_NAME
>  		       ": Fatal interrupt. Scheduling firmware
> restart.\n");
> +		WARN_ON(1);
> +
> +		BUG_ON(ipw2100_max_fatal_ints-- <= 0);

BUG_ON in interrupt context is just extremely hostile, since it means
the box is dead.

also I would suggest using WARN_ON_ONCE() 

-- 
Arjan van de Ven 	Intel Open Source Technology Centre
For development, discussion and tips for power savings, 
visit http://www.lesswatts.org
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