AcoSail/kernel_optimize_test
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ata: make ata port as parent device of scsi host

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Currently, the device tree of ata port and scsi host looks as below,

        /sys/devices/pci0000:00/0000:00:1f.2    (ahci controller)
        |-- ata1                                (ata port)
        |-- host0                               (scsi host)
           |-- target0:0:0                      (scsi target)
               |-- 0:0:0:0                      (disk)

This patch makes ata port as parent device of scsi host, then it becomes

        /sys/devices/pci0000:00/0000:00:1f.2    (ahci controller)
        |-- ata1                                (ata port)
            |-- host0                           (scsi host)
                |-- target0:0:0                 (scsi target)
                    |-- 0:0:0:0                 (disk)

With this change, the ata port runtime PM is easier.
For example, the ata port runtime suspend will happen as,

disk suspend --> scsi target suspend --> scsi host suspend --> ata port
suspend.

Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Lin Ming 2011-12-05 09:20:23 +08:00 committed by Jeff Garzik
parent 7faa33da9b
commit 9a6d6a2dda
1 changed files with 1 additions and 1 deletions
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2
drivers/ata/libata-scsi.c
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@ -3398,7 +3398,7 @@ int ata_scsi_add_hosts(struct ata_host *host, struct scsi_host_template *sht)
*/
shost->max_host_blocked = 1;
rc = scsi_add_host(ap->scsi_host, ap->host->dev);
rc = scsi_add_host(ap->scsi_host, &ap->tdev);
if (rc)
goto err_add;
}