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

Guenter Roeck
2014-10-07T05:28:44Z

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-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Signed-off-by: Guenter Roeck <linux-0h96xk9xTtrk1uMJSBkQmQ@public.gmane.org>
---
drivers/firmware/efi/reboot.c | 23 +++++++++++++++++++----
1 file changed, 19 insertions(+), 4 deletions(-)

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-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
*/
#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