On Mon, 6 Aug 2012, Ming Lei wrote: > Maybe the return value should be passed to caller. Also the race between > 'func' and its .runtime_resume callback should be stated in comment. > > In fact, maybe it is better to call 'func' always first, then call > ' rpm_resume(dev, RPM_ASYNC);', otherwise the driver may > be confused about the order between 'func' and its .runtime_resume > callback. > Another way is to define 'func' as 'runtime_pre_resume' > in 'struct dev_pm_ops', and there are some advantages about this way: > > - save one pointer in 'struct devices, since most of devices > don't need the 'func' > - well documents on 'runtime_pre_resume' > - caller of pm_runtime_get_and_call may be happier, maybe just > pm_runtime_get or *_aync is enough. No, no, you have completely misunderstood the whole point of this change. The idea is for "func" to be called at a time when it is known that the device is at full power. That means it _has_ to be called after the runtime_resume callback returns. Also, "func" should not be stored in dev_pm_ops because it won't be a read-only value. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
