Messages in this thread | | | Date | Fri, 27 Feb 2009 09:46:16 -0500 (EST) | From | Alan Stern <> | Subject | Re: [RFD] Automatic suspend |
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On Fri, 27 Feb 2009, Pavel Machek wrote:
> > > To summarize, we can: > > * Use a refcount such that automatic suspend will only be possible if it's > > equal to zero (but that need not be the only criterion). > > * Use a per-device flag in dev_pm_info that will be set whenever the device > > driver increases the refcount and unset whenever the driver decreases the > > refcount. > > * Use a per-process flag that will be set whenever the process increases the > > refcount and unset whenever the process decreases the refcount. > > Yes, that sounds sane, and that's how reasonable wakelock > implementation should look like.
One small point: If you add a per-device flag and a per-process flag as described above, then drivers and processes must not acquire nested references.
Obviously this is fixable, but it's worth mentioning...
Alan Stern
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