Commit 44be28e9dd98 ("x86/reboot: Add EFI reboot quirk for ACPI Hardware
Reduced flag") sets pm_power_off to efi_power_off() when the
acpi_gbl_reduced_hardware flag is set.

According to its commit message this is necessary because: "BayTrail-T
class of hardware requires EFI in order to powerdown and reboot and no
other reliable method exists"

But I have a Bay Trail CR tablet where the EFI_RESET_SHUTDOWN call does
not work, it simply returns without doing anything (AFAICT).

So it seems that some Bay Trail devices must use EFI for power-off, while
for others only ACPI works.

Note that efi_power_off() only gets used if the platform code defines
efi_poweroff_required() and that returns true, this currently only ever
happens on x86.

Since on the devices which need ACPI for power-off the EFI_RESET_SHUTDOWN
call simply returns, this patch makes the efi-reboot code remember the
old pm_power_off handler and if EFI_RESET_SHUTDOWN returns it falls back
to calling that.

This seems preferable to dmi-quirking our way out of this, since there
are likely quite a few devices suffering from this.

Cc: Mark Salter <msal...@redhat.com>
Signed-off-by: Hans de Goede <hdego...@redhat.com>
---
 drivers/firmware/efi/reboot.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/firmware/efi/reboot.c b/drivers/firmware/efi/reboot.c
index 62ead9b..7117e2d 100644
--- a/drivers/firmware/efi/reboot.c
+++ b/drivers/firmware/efi/reboot.c
@@ -5,6 +5,8 @@
 #include <linux/efi.h>
 #include <linux/reboot.h>
 
+void (*orig_pm_power_off)(void);
+
 int efi_reboot_quirk_mode = -1;
 
 void efi_reboot(enum reboot_mode reboot_mode, const char *__unused)
@@ -51,6 +53,12 @@ bool __weak efi_poweroff_required(void)
 static void efi_power_off(void)
 {
        efi.reset_system(EFI_RESET_SHUTDOWN, EFI_SUCCESS, 0, NULL);
+       /*
+        * The above call should not return, if it does fall back to
+        * the original power off method (typically ACPI poweroff).
+        */
+       if (orig_pm_power_off)
+               orig_pm_power_off();
 }
 
 static int __init efi_shutdown_init(void)
@@ -58,8 +66,10 @@ static int __init efi_shutdown_init(void)
        if (!efi_enabled(EFI_RUNTIME_SERVICES))
                return -ENODEV;
 
-       if (efi_poweroff_required())
+       if (efi_poweroff_required()) {
+               orig_pm_power_off = pm_power_off;
                pm_power_off = efi_power_off;
+       }
 
        return 0;
 }
-- 
2.9.3

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