On Thu, 23 Apr 2015, Geert Uytterhoeven wrote: > >> I'm afraid you can't call pm_runtime_get_sync() from these methods, as > >> they may be called from interrupt context. > > > > Ouch. I know the clock framework has prepare/enable separated with > > context, but with the irqchip callbacks I suppose no such separation > > It's not the clock operations, but the pm_runtime operations that cannot be > called from interrupt context.
In fact the pm_runtime operations _can_ be called from interrupt context, provided the driver has first invoked pm_runtime_irq_safe(). Of course, this requires that none of the runtime-PM callback routines ever sleep or perform a blocking operation. This is all explained in Documentation/power/runtime_pm.txt (search for "irq_safe"). Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
