> 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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