[dm-devel] Re: [PATCH 1/3][RESUBMIT] scsi_dh_rdac: move the init code from rdac_activate to rdac_bus_attach

[Chandra Seetharaman <sekharan us ibm com>]

Acked-by: Chandra Seetharaman <sekharan us ibm com>
On Thu, 2009-09-03 at 21:42 -0600, Moger, Babu wrote:
> Moving the initialization code from rdac_activate to rdac_bus_attach which is more efficient.
> We don't have to collect all the information during every activate. 
> 
> Signed-off-by: Babu Moger <babu moger lsi com>
> Reviewed-by: Vijay Chauhan <vijay chauhan lsi com>
> Reviewed-by: Bob Stankey <Robert stankey lsi com>
> 
> ---
> --- linux-2.6.31-rc5/drivers/scsi/device_handler/scsi_dh_rdac.c.orig	2009-09-03 13:39:52.000000000 -0500
> +++ linux-2.6.31-rc5/drivers/scsi/device_handler/scsi_dh_rdac.c	2009-09-03 14:10:40.000000000 -0500
> @@ -525,17 +525,6 @@ static int rdac_activate(struct scsi_dev
>  	if (err != SCSI_DH_OK)
>  		goto done;
>  
> -	if (!h->ctlr) {
> -		err = initialize_controller(sdev, h);
> -		if (err != SCSI_DH_OK)
> -			goto done;
> -	}
> -
> -	if (h->ctlr->use_ms10 == -1) {
> -		err = set_mode_select(sdev, h);
> -		if (err != SCSI_DH_OK)
> -			goto done;
> -	}
>  	if (h->lun_state == RDAC_LUN_UNOWNED)
>  		err = send_mode_select(sdev, h);
>  done:
> @@ -674,12 +663,20 @@ static int rdac_bus_attach(struct scsi_d
>  	if (err != SCSI_DH_OK)
>  		goto failed;
>  
> -	err = check_ownership(sdev, h);
> +	err = initialize_controller(sdev, h);
>  	if (err != SCSI_DH_OK)
>  		goto failed;
>  
> +	err = check_ownership(sdev, h);
> +	if (err != SCSI_DH_OK)
> +		goto clean_ctlr;
> +
> +	err = set_mode_select(sdev, h);
> +	if (err != SCSI_DH_OK)
> +		goto clean_ctlr;
> +
>  	if (!try_module_get(THIS_MODULE))
> -		goto failed;
> +		goto clean_ctlr;
>  
>  	spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
>  	sdev->scsi_dh_data = scsi_dh_data;
> @@ -691,6 +688,9 @@ static int rdac_bus_attach(struct scsi_d
>  
>  	return 0;
>  
> +clean_ctlr:
> +	kref_put(&h->ctlr->kref, release_controller);
> +
>  failed:
>  	kfree(scsi_dh_data);
>  	sdev_printk(KERN_ERR, sdev, "%s: not attached\n",
> 
>