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Date:	Tue, 6 Oct 2015 02:40:40 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	Lee Duncan <lduncan@...e.com>
Cc:	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	Tejun Heo <tj@...nel.org>, Hannes Reinecke <hare@...e.com>,
	Johannes Thumshirn <jthumshirn@...e.de>,
	Christoph Hellwig <hch@...radead.org>
Subject: Re: [PATCHv2 1/1] SCSI: update hosts module to use idr index
 management

>  struct Scsi_Host *scsi_host_lookup(unsigned short hostnum)
>  {
> -	struct device *cdev;
> -	struct Scsi_Host *shost = NULL;
> -
> -	cdev = class_find_device(&shost_class, NULL, &hostnum,
> -				 __scsi_host_match);
> -	if (cdev) {
> -		shost = scsi_host_get(class_to_shost(cdev));
> -		put_device(cdev);
> -	}
> +	struct Scsi_Host *shost;
> +
> +	spin_lock(&host_index_lock);
> +	shost = idr_find(&host_index_idr, hostnum);
> +	spin_unlock(&host_index_lock);
> +
>  	return shost;

How does this actually grab a reference to the host?
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