Re: [PATCH RESEND v10 02/11] reboot: Add hardware protection power-off

[Daniel Lezcano <daniel.lezcano@linaro.org>]

On 03/06/2021 07:40, Matti Vaittinen wrote:
> There can be few cases when we need to shut-down the system in order to
> protect the hardware. Currently this is done at least by the thermal core
> when temperature raises over certain limit.
> 
> Some PMICs can also generate interrupts for example for over-current or
> over-voltage, voltage drops, short-circuit, ... etc. On some systems
> these are a sign of hardware failure and only thing to do is try to
> protect the rest of the hardware by shutting down the system.
> 
> Add shut-down logic which can be used by all subsystems instead of
> implementing the shutdown in each subsystem. The logic is stolen from
> thermal_core with difference of using atomic_t instead of a mutex in
> order to allow calls directly from IRQ context and changing the WARN()
> to pr_emerg() as discussed here:
> https://lore.kernel.org/lkml/YJuPwAZroVZ%2Fw633@alley/
> and here:
> https://lore.kernel.org/linux-iommu/20210331093104.383705-4-geert+renesas@glider.be/
> 
> Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>

Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>


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