Messages in this thread | | | Date | Wed, 27 Oct 2010 12:48:16 +0100 | From | Alan Cox <> | Subject | Re: sysfs and power management |
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> I started to wonder if it makes sense to enhance sysfs so that it > optionally prodives open / close call backs. Internally sysfs has > some bookkeeping about the refcount but this is not visible to the > driver. Of course majority of the sysfs users doesn't need that at all > and for them this is just overhead.
I think we need it. There doesn't need to be much overhead however as there is no need (or sense) in providing per sysfs node open/close hooks.
The pm layer also lacks a clean race-free way to actually ascertain when the device was last kicked out of pm saving.
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