Re: [PATCH v4] kernel: Add support for power-off handler call chain

[Heiko Stübner]

Am Dienstag, 28. Oktober 2014, 10:11:06 schrieb Guenter Roeck:
> Various drivers implement architecture and/or device specific means to
> power off the system.  For the most part, those drivers set the global
> variable pm_power_off to point to a function within the driver.
> 
> This mechanism has a number of drawbacks.  Typically only one scheme
> to remove power is supported (at least if pm_power_off is used).
> At least in theory there can be multiple means remove power, some of
> which may be less desirable. For example, some mechanisms may only
> power off the CPU or the CPU card, while another may power off the
> entire system.  Others may really just execute a restart sequence
> or drop into the ROM monitor. Using pm_power_off can also be racy
> if the function pointer is set from a driver built as module, as the
> driver may be in the process of being unloaded when pm_power_off is
> called. If there are multiple power-off handlers in the system, removing
> a module with such a handler may inadvertently reset the pointer to
> pm_power_off to NULL, leaving the system with no means to remove power.
> 
> 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 and architeceture code
> providing system power-off functionality are expected to register with
> this call chain.  When registering a power-off handler, callers can
> provide a priority to control power-off handler execution sequence
> and thus ensure that the power-off handler with the optimal capabilities
> to remove power for a given system is called first.
> 
> Cc: Alan Cox <gnomes@xxxxxxxxxxxxxxxxxxx>
> Cc: Alexander Graf <agraf@xxxxxxx>
> Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
> Cc: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
> cc: Heiko Stuebner <heiko@xxxxxxxxx>
> Cc: Lee Jones <lee.jones@xxxxxxxxxx>
> Cc: Len Brown <len.brown@xxxxxxxxx>
> Cc: Pavel Machek <pavel@xxxxxx>
> Cc: Philippe Rétornaz <philippe.retornaz@xxxxxxxxx>
> Cc: Rafael J. Wysocki <rjw@xxxxxxxxxxxxx>
> Cc: Romain Perier <romain.perier@xxxxxxxxx>
> Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
> ---

Similarly to the restart handlers, I really like the concept.

Acked-by: Heiko Stuebner <heiko@xxxxxxxxx>

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