x86_64: Fix S3 fail path

As acpi_enter_sleep_state can fail, take this into account in
do_suspend_lowlevel and don't return to the do_suspend_lowlevel's
caller. This would break (currently) fpu status and preempt count.

Technically, this means use `call' instead of `jmp' and `jmp' to
the `resume_point' after the `call' (i.e. if
acpi_enter_sleep_state returns=fails). `resume_point' will handle
the restore of fpu and preempt count gracefully.

Signed-off-by: Jiri Slaby <jirislaby@gmail.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Len Brown <len.brown@intel.com>

diff --git a/arch/x86/kernel/acpi/wakeup_64.S b/arch/x86/kernel/acpi/wakeup_64.S
index b5dee6a..96258d9 100644 (file)
--- a/arch/x86/kernel/acpi/wakeup_64.S
+++ b/arch/x86/kernel/acpi/wakeup_64.S
@@ -73,7 +73,9 @@ ENTRY(do_suspend_lowlevel)
        addq    $8, %rsp
        movl    $3, %edi
        xorl    %eax, %eax
-       jmp     acpi_enter_sleep_state
+       call    acpi_enter_sleep_state
+       /* in case something went wrong, restore the machine status and go on */
+       jmp     resume_point
 
        .align 4
 resume_point: