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

[Guenter Roeck <linux@xxxxxxxxxxxx>]

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@xxxxxxxxx>
Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
---
 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@xxxxxxxxxx>
  */
 #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


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