linux-kernel - Re: [PATCH 4/6] scsi: device handlers must have attach and detach methods

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Date:	Mon, 20 Oct 2014 08:04:16 +0200
From:	Hannes Reinecke <hare@...e.de>
To:	Christoph Hellwig <hch@....de>,
	Chandra Seetharaman <sekharan@...ibm.com>,
	Mike Christie <michaelc@...wisc.edu>
CC:	Sean Stewart <Sean.Stewart@...app.com>,
	Bart Van Assche <bvanassche@....org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/6] scsi: device handlers must have attach and detach
 methods

On 10/19/2014 06:00 PM, Christoph Hellwig wrote:
> Signed-off-by: Christoph Hellwig <hch@....de>
> ---
>  drivers/scsi/device_handler/scsi_dh.c | 25 +++++++++++++------------
>  1 file changed, 13 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/scsi/device_handler/scsi_dh.c b/drivers/scsi/device_handler/scsi_dh.c
> index 1a8dbf3..d8a8aac 100644
> --- a/drivers/scsi/device_handler/scsi_dh.c
> +++ b/drivers/scsi/device_handler/scsi_dh.c
> @@ -108,19 +108,17 @@ static int scsi_dh_handler_attach(struct scsi_device *sdev,
>  		return 0;
>  	}
>  
> -	if (scsi_dh->attach) {
> -		if (!try_module_get(scsi_dh->module))
> -			return -EINVAL;
> -
> -		err = scsi_dh->attach(sdev);
> -		if (err) {
> -			module_put(scsi_dh->module);
> -			return err;
> -		}
> +	if (!try_module_get(scsi_dh->module))
> +		return -EINVAL;
>  
> -		kref_init(&sdev->scsi_dh_data->kref);
> -		sdev->scsi_dh_data->sdev = sdev;
> +	err = scsi_dh->attach(sdev);
> +	if (err) {
> +		module_put(scsi_dh->module);
> +		return err;
>  	}
> +
> +	kref_init(&sdev->scsi_dh_data->kref);
> +	sdev->scsi_dh_data->sdev = sdev;
>  	return err;
>  }
>  
> @@ -154,7 +152,7 @@ static void scsi_dh_handler_detach(struct scsi_device *sdev,
>  	if (!scsi_dh)
>  		scsi_dh = sdev->scsi_dh_data->scsi_dh;
>  
> -	if (scsi_dh && scsi_dh->detach)
> +	if (scsi_dh)
>  		kref_put(&sdev->scsi_dh_data->kref, __detach_handler);
>  }
>  
> @@ -343,6 +341,9 @@ int scsi_register_device_handler(struct scsi_device_handler *scsi_dh)
>  	if (get_device_handler(scsi_dh->name))
>  		return -EBUSY;
>  
> +	if (!scsi_dh->attach || !scsi_dh->detach)
> +		return -EINVAL;
> +
>  	spin_lock(&list_lock);
>  	list_add(&scsi_dh->list, &scsi_dh_list);
>  	spin_unlock(&list_lock);
> 
Reviewed-by: Hannes Reinecke <hare@...e.de>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		      zSeries & Storage
hare@...e.de			      +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: J. Hawn, J. Guild, F. Imendörffer, HRB 16746 (AG Nürnberg)
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