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Re: [linux-pm] subtle pm_runtime_put_sync race and sdio functions

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Vitaly Wool <vitalywool@xxxxxxxxx> writes:

> Hi Kevin,
>
>> Therefore, what is ideally needed is the ability for A's suspend to
>> simply call pm_runtime_suspend() so the subsystem can do the work.
>> However, since runtime transitions are locked out by this time, that
>> doesn't work. ÂIOW, what is needed is a way for a system suspend to say
>> "please finish the runtime suspend that was already requested."
>>
>> What I've done to work around this in driver A is to manually check
>> pm_runtime_suspended() and directly call the subsystem's runtime
>> suspend/resume (patch below[1]. ÂNOTE, I've used the _noirq methods to
>> ensure device A is available when device B needs it.)
>
> suppose this driver runs on a platform that has runtime PM disabled.
> How is it going to work then?
>

Then pm_runtime_suspended() will be false, and the bus methods will
suspend the device.

Kevin

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