Re: [PATCH v6 00/48] kernel: Add support for power-off handler call chain

[Guenter Roeck]

On 11/10/2014 12:33 AM, Pavel Machek wrote:
> Hi!
>
> > Introduce a system power-off handler call chain to solve the described
> > problems.  This call chain is expected to be executed from the architecture
> > specific machine_power_off() function.  Drivers providing system power-off
> > functionality are expected to register with this call chain.  By using the
> > priority field in the notifier block, callers can control power-off
> > handler
>
> Linus rather disliked the idea of notifier chains for this... And I
> don't see how it got addressed.
As I understand, Linus primarily disliked the idea of callbacks, which is
what the code does, only with no order or protection against race conditions.

Frankly I have no idea how to solve the power-off problem without callbacks.
If you have one, please let me know.

Guenter

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