Re: [PATCH 1/2] libata: reimplement suspend/resume support using sdev->manage_start_stop

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Tejun Heo wrote:
Reimplement suspend/resume support using sdev->manage_start_stop.

* Device suspend/resume is now SCSI layer's responsibility and the
  code is simplified a lot.

* DPM is dropped.  This also simplifies code a lot.  Suspend/resume
  status is port-wide now.

* ata_scsi_device_suspend/resume() and ata_dev_ready() removed.

* Resume now has to wait for disk to spin up before proceeding.  I
  couldn't find easy way out as libata is in EH waiting for the
  disk to be ready and sd is waiting for EH to complete to issue
  START_STOP.

* sdev->manage_start_stop is set to 1 in ata_scsi_slave_config().
  This fixes spindown on shutdown and suspend-to-disk.

Signed-off-by: Tejun Heo <htejun@xxxxxxxxx>

applied patches 1-2, but explicitly did not send them upstream today.

I'm hoping we can get this into 2.6.22 -- but also expose it in -mm for a few days as well.

I agree it is important to fix this issue.

	Jeff



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