linux-kernel - Re: [PATCH 14/22] ncr5380: Add MAX

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Date:	Mon, 14 Mar 2016 08:43:15 +0100
From:	Hannes Reinecke <hare@...e.de>
To:	Finn Thain <fthain@...egraphics.com.au>,
	"James E.J. Bottomley" <James.Bottomley@...senPartnership.com>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Michael Schmitz <schmitzmic@...il.com>,
	linux-m68k@...r.kernel.org, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc:	Ondrej Zary <linux@...nbow-software.org>,
	Sam Creasey <sammy@...my.net>
Subject: Re: [PATCH 14/22] ncr5380: Add MAX_LUN limit

On 03/14/2016 05:27 AM, Finn Thain wrote:
> The driver has a limit of eight LUs because of the byte-sized bitfield
> that is used for busy flags. Reject commands with LUN > 7.
> 
> Signed-off-by: Finn Thain <fthain@...egraphics.com.au>
> 
> ---
>  drivers/scsi/NCR5380.c |    6 ++++++
>  drivers/scsi/NCR5380.h |    2 ++
>  2 files changed, 8 insertions(+)
> 
> Index: linux/drivers/scsi/NCR5380.c
> ===================================================================
> --- linux.orig/drivers/scsi/NCR5380.c	2016-03-14 15:26:45.000000000 +1100
> +++ linux/drivers/scsi/NCR5380.c	2016-03-14 15:26:48.000000000 +1100
> @@ -661,6 +661,12 @@ static int NCR5380_queue_command(struct
>  	}
>  #endif /* (NDEBUG & NDEBUG_NO_WRITE) */
>  
> +	if (cmd->device->lun > MAX_LUN) {
> +		cmd->result = DID_NO_CONNECT << 16;
> +		cmd->scsi_done(cmd);
> +		return 0;
> +	}
> +
>  	cmd->result = 0;
>  
>  	if (!NCR5380_acquire_dma_irq(instance))
> Index: linux/drivers/scsi/NCR5380.h
> ===================================================================
> --- linux.orig/drivers/scsi/NCR5380.h	2016-03-14 15:26:45.000000000 +1100
> +++ linux/drivers/scsi/NCR5380.h	2016-03-14 15:26:48.000000000 +1100
> @@ -244,6 +244,8 @@ struct NCR5380_hostdata {
>  
>  #ifdef __KERNEL__
>  
> +#define MAX_LUN	7
> +
>  struct NCR5380_cmd {
>  	struct list_head list;
>  };
> 
> 
Why not simply use shost->max_lun ?

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		   Teamlead Storage & Networking
hare@...e.de			               +49 911 74053 688
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
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