linux-kernel - Re: [PATCH 42/44] efi: Register poweroff handler with kernel poweroff handler

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Date:	Thu, 16 Oct 2014 15:59:27 +0100
From:	Matt Fleming <matt@...sole-pimps.org>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-pm@...r.kernel.org, Matt Fleming <matt.fleming@...el.com>,
	Mark Salter <msalter@...hat.com>
Subject: Re: [PATCH 42/44] efi: Register poweroff handler with kernel
 poweroff handler

On Mon, 06 Oct, at 10:28:44PM, Guenter Roeck wrote:
> Register with kernel poweroff handler instead of setting pm_power_off
> directly. Register with low priority value of 64 since the efi code
> states that this is a poweroff handler of last resort.
> 
> Cc: Matt Fleming <matt.fleming@...el.com>
> Signed-off-by: Guenter Roeck <linux@...ck-us.net>
> ---
>  drivers/firmware/efi/reboot.c | 23 +++++++++++++++++++----
>  1 file changed, 19 insertions(+), 4 deletions(-)
 
Looks OK to me. Mark?

> diff --git a/drivers/firmware/efi/reboot.c b/drivers/firmware/efi/reboot.c
> index 9c59d1c..c082439 100644
> --- a/drivers/firmware/efi/reboot.c
> +++ b/drivers/firmware/efi/reboot.c
> @@ -3,6 +3,8 @@
>   * Copyright (c) 2014 Red Hat, Inc., Mark Salter <msalter@...hat.com>
>   */
>  #include <linux/efi.h>
> +#include <linux/notifier.h>
> +#include <linux/pm.h>
>  #include <linux/reboot.h>
>  
>  int efi_reboot_quirk_mode = -1;
> @@ -38,19 +40,32 @@ bool __weak efi_poweroff_required(void)
>  	return false;
>  }
>  
> -static void efi_power_off(void)
> +static int efi_power_off(struct notifier_block *this,
> +			 unsigned long unused1, void *unused2)
>  {
>  	efi.reset_system(EFI_RESET_SHUTDOWN, EFI_SUCCESS, 0, NULL);
> +
> +	return NOTIFY_DONE;
>  }
>  
> +static struct notifier_block efi_poweroff_nb = {
> +	.notifier_call = efi_power_off,
> +	.priority = 64,
> +};
> +
>  static int __init efi_shutdown_init(void)
>  {
> +	int ret = 0;
> +
>  	if (!efi_enabled(EFI_RUNTIME_SERVICES))
>  		return -ENODEV;
>  
> -	if (efi_poweroff_required())
> -		pm_power_off = efi_power_off;
> +	if (efi_poweroff_required()) {
> +		ret = register_poweroff_handler(&efi_poweroff_nb);
> +		if (ret)
> +			pr_err("efi: Failed to register poweroff handler\n");
> +	}
>  
> -	return 0;
> +	return ret;
>  }
>  late_initcall(efi_shutdown_init);
> -- 
> 1.9.1


-- 
Matt Fleming, Intel Open Source Technology Center
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