Messages in this thread | | | Date | Tue, 07 Oct 2014 09:46:59 +0200 | From | Philippe Rétornaz <> | Subject | Re: [PATCH 01/44] kernel: Add support for poweroff handler call chain |
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Hello
This seems exactly what I would need on the mc13783 to handle cleanly the poweroff, but after reading this patchset I have the following question:
[...]
> +/* > + * Notifier list for kernel code which wants to be called > + * to power off the system. > + */ > +static ATOMIC_NOTIFIER_HEAD(poweroff_handler_list);
[...]
> +void do_kernel_poweroff(void) > +{ > + atomic_notifier_call_chain(&poweroff_handler_list, 0, NULL); > +} > +
It seems that the poweroff callback needs to be atomic as per _atomic_notifier_call_chain documentation:
"Calls each function in a notifier chain in turn. The functions run in an atomic context"
But this is a problem for many MFD (mc13783, twl4030 etc ...) which are accessible on only a blocking bus (SPI, I2C).
What I am missing here ?
Thanks,
Philippe
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