linux-kernel - Re: [PATCH] cciss: force ignore of responses to unsent scsi commands after kexec reboot

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Date:	Thu, 14 Jun 2007 08:59:24 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Neil Horman <nhorman@...driver.com>
Cc:	linux-kernel@...r.kernel.org, mike.miller@...com,
	iss_storagedev@...com, akpm@...ux-foundation.org
Subject: Re: [PATCH] cciss: force ignore of responses to unsent scsi
 commands after kexec reboot

On Thu, 14 Jun 2007 11:31:19 -0400 Neil Horman wrote:

> Hey -
> 	cciss hardware currently can continue to send responses to scsi commands
> after the host system has undergone a kexec reboot.  The way the drier is
> currently written, reception of these commands results in a BUG halt, since it
> can't match the response to any issued command since the boot.  This patch
> corrects that by using the kexec reset_devices command line paramter to force
> ignore any commands that it cant correlate.
> 
> Regards
> Neil
> 
> Signed-off-by: Neil Horman <nhorman@...driver.com>
> 
> 
>  cciss.c |    8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> 
> diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
> index 5acc6c4..ec1c1d2 100644
> --- a/drivers/block/cciss.c
> +++ b/drivers/block/cciss.c
> @@ -2131,6 +2131,14 @@ static int add_sendcmd_reject(__u8 cmd, int ctlr, unsigned long complete)
>  		       ctlr, complete);
>  		/* not much we can do. */
>  #ifdef CONFIG_CISS_SCSI_TAPE
> +		/* We might get notification of completion of commands
> +		 * which we never issued in this kernel if this boot is
> +		 * taking place after previous kernel's crash. Simply
> +		 * ignore the commands in this case.
> +		 */
> +		if (reset_devices)
> +			return 0;
> +
>  		return 1;
>  	}

But this patch applies only to SCSI tape devices, not to
disk devices?

---
~Randy
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