Subject: [PATCH v3 1/3] power: reset: add linkstation-reset driver

From: [email-masked] (Andrew Lunn)
Date: Tue, 3 Jan 2017 14:09:16 +0100

> > +
> > +	/* Check that nothing else has already setup a handler */
> > +	if (pm_power_off) {
> > +		lookup_symbol_name((ulong)pm_power_off, symname);
> > +		dev_err(&pdev->dev,
> > +			"pm_power_off already claimed %p %s",
> > +			pm_power_off, symname);
> > +		return -EBUSY;
> > +	}
> > +	pm_power_off = linkstation_reset;
> 
> That seems a bit complicated, why not just assume that there will be
> either this driver used, or not at all?

That is probably my fault. This is a copy from code i wrote many years
ago for the QNAP. I guess at the time i was battling with two
different pm_power_off handlers, so put in this code.

> Also, you are supposed to register a reboot notifier to which you can
> pass private context:

At the time i wrote the QNAP code, this did not exist. So maybe my
code is no longer a good example to copy.

	 Andrew