linux-kernel - Re: [BUGFIX 2/2] gdth: bugfix for the Timer at exit crash

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Message-ID: <47B29702.7050503@allied-internet.ag>
Date:	Wed, 13 Feb 2008 08:06:42 +0100
From:	Stefan Priebe - allied internet ag <s.priebe@...ied-internet.ag>
To:	Boaz Harrosh <bharrosh@...asas.com>
CC:	Sven Köhler <skoehler@....de>,
	Christoph Hellwig <hch@...radead.org>,
	Jeff Garzik <jeff@...zik.org>,
	linux-scsi <linux-scsi@...r.kernel.org>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	linux-kernel@...r.kernel.org, Joerg Dorchain <joerg@...chain.net>,
	Jon Chelton <jchelton@...global.com>
Subject: Re: [BUGFIX 2/2] gdth: bugfix for the Timer at exit crash

Hello!

I've tested this patch now - and it works fine. Now rmmod, halt and 
reboot also works.

Stefan Priebe


Boaz Harrosh schrieb:
> gdth _exit would first remove all cards then stop the timer
> and would not sync with the timer function. This caused a crash
> in gdth_timer() when module was unloaded.
> 
> del_timer_sync the timer before we delete the cards.
> 
> NOT YET TESTED
> 
> Signed-off-by: Boaz Harrosh <bharrosh@...asas.com>
> ---
>  drivers/scsi/gdth.c |   15 ++++++++-------
>  1 files changed, 8 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/scsi/gdth.c b/drivers/scsi/gdth.c
> index 8eb78be..103280e 100644
> --- a/drivers/scsi/gdth.c
> +++ b/drivers/scsi/gdth.c
> @@ -3793,6 +3793,8 @@ static void gdth_timeout(ulong data)
>      gdth_ha_str *ha;
>      ulong flags;
>  
> +    BUG_ON(list_empty(&gdth_instances));
> +
>      ha = list_first_entry(&gdth_instances, gdth_ha_str, list);
>      spin_lock_irqsave(&ha->smp_lock, flags);
>  
> @@ -5146,8 +5148,6 @@ static void gdth_remove_one(gdth_ha_str *ha)
>  		ha->sdev = NULL;
>  	}
>  
> -	gdth_flush(ha);
> -
>  	if (shp->irq)
>  		free_irq(shp->irq,ha);
>  
> @@ -5245,14 +5245,15 @@ static void __exit gdth_exit(void)
>  {
>  	gdth_ha_str *ha;
>  
> -	list_for_each_entry(ha, &gdth_instances, list)
> -		gdth_remove_one(ha);
> +	unregister_chrdev(major,"gdth");
> +	unregister_reboot_notifier(&gdth_notifier);
>  
>  #ifdef GDTH_STATISTICS
> -	del_timer(&gdth_timer);
> +	del_timer_sync(&gdth_timer);
>  #endif
> -	unregister_chrdev(major,"gdth");
> -	unregister_reboot_notifier(&gdth_notifier);
> +
> +	list_for_each_entry(ha, &gdth_instances, list)
> +		gdth_remove_one(ha);
>  }
>  
>  module_init(gdth_init);
--
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