Hello,
On Thu, Nov 24, 2011 at 2:54 PM, Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote:
> Therefore, when entering the SUSPEND or HIBERNATE stages of system
> sleep, we can skip the callback to the driver if the device is already
> in runtime suspend. When entering the FREEZE stage, however, we should
> first issue a runtime resume. The overhead of doing this is
> negligible, because a suspended drive would be spun up during the THAW
> stage of hibernation anyway.
My brain is half fried at the moment so maybe you're saying the same
thing, but I hope this is something simple. Like...
/* for libata runtime suspend is equivalent to suspend */
if (runtime suspended && target == SUSPEND) {
yeah! skip drive pm ops;
} else {
end runtime pm;
ask EH to enter target PM state;
}
I really don't think we need to optimize this further than this.
Thanks.
--
tejun
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