Re: Allow runtime suspend during system resume

[Phillip Susi <psusi@ubuntu.com>]

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On 1/9/2014 10:32 AM, Alan Stern wrote:
> I had in mind something more like this for the driver's .resume
> (or .resume_early) routine:
> 
> bool leave_suspended = false; int rc = 0;
> 
> if (!pm_runtime_in_use(dev) && !disk_is_spinning(dev)) 
> leave_suspended = true; else rc = spin_up_the_disk(dev);
> 
> if (rc == 0) { pm_runtime_disable(dev); if (leave_suspended) 
> pm_runtime_set_suspended(dev); else pm_runtime_set_active(dev); 
> pm_runtime_enable(dev); } return rc;

We also don't want to block the resume path while the REQUEST SENSE
runs, since it typically takes 10 seconds or so on normal ATA disks.
Thus, the resume or resume early needs to be able to return with the
device left in the transitioning state and complete or abort the
transition later.


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