On Mon, 17 Nov 2014, Dmitry Torokhov wrote: > > > However, is it allowed to call pm_runtime_get_sync() on devices that > > > didn't issue pm_runtime_enable()? > > > > Yes. But the bus has to issue pm_runtime_enable() before probing the > > driver, because the driver will expect runtime PM to work properly > > while its probe routine runs. For example, the probe routine might > > want to leave the device in a runtime-suspended state. It can't do > > that if the device isn't enabled for runtime PM. > > That means that runtime PM will be enabled for all devices on given bus > while up till now drivers were deciding if their devices should be > runtime-pm-managed or not. I do not think we are quite ready for this. It's up to both the bus _and_ the driver to make this decision. If a driver is completely runtime-PM-unaware then it will never decrement the device's usage counter (which was incremented when the bus called _get_noresume()), and therefore the device will never be runtime-suspended. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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