Re: [PATCH] cpu/hotplug: handle unbalanced hotplug enable/disable

From: Thomas Gleixner
Date: Mon May 02 2016 - 04:13:07 EST

On Fri, 29 Apr 2016, Lianwei Wang wrote:
> On Thu, Apr 28, 2016 at 5:44 PM, Thomas Gleixner <tglx@xxxxxxxxxxxxx> wrote:
> > Wrong. This is the symptom. The root cause is in #1. Therefor you are trying
> > to fix the symptom and not the root cause
> >
> I don't understand why you keep saying that the issue is in the pm
> notifier callback. As I told you, the pm notifier return an error(or
> NOTIFY_BAD) on purpose to abort the suspend process. This is work as
> design. Any driver can abort the suspend process if it is not ready to
> suspend.

Right. That's not the issue. The issue is that as a consequence we end up with
an unbalanced count. So how do we end up with an unbalanced count? That's what
needs to be fixed and not worked around.

> > I completely understand that you are tyring to put the cart before the horse.
> No. Your understanding is wrong.

My understanding is very correct. We have a situation which leads to an
unbalanced count. Instead of fixing that, you fix up the unbalanced count.