Merge tag 'pm-urgent-4.8-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

torvalds · torvalds · commit 601f887d6105 · 2016-07-29T14:34:55.000-07:00
Pull power management fix from Rafael Wysocki:
 "Fix a nasty (and really hard to debug) memory corruption during resume
  from hibernation on x86-64 (that leads to a kernel panic most of the
  time) due to the use of a stale stack pointer value in FRAME_BEGIN
  (Josh Poimboeuf)"

* tag 'pm-urgent-4.8-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  x86/power/64: Fix hibernation return address corruption
diff --git a/arch/x86/power/hibernate_asm_64.S b/arch/x86/power/hibernate_asm_64.S
@@ -24,7 +24,6 @@
 #include <asm/frame.h>
 
 ENTRY(swsusp_arch_suspend)
-	FRAME_BEGIN
 	movq	$saved_context, %rax
 	movq	%rsp, pt_regs_sp(%rax)
 	movq	%rbp, pt_regs_bp(%rax)
@@ -48,6 +47,7 @@ ENTRY(swsusp_arch_suspend)
 	movq	%cr3, %rax
 	movq	%rax, restore_cr3(%rip)
 
+	FRAME_BEGIN
 	call swsusp_save
 	FRAME_END
 	ret
@@ -104,7 +104,6 @@ ENTRY(core_restore_code)
 	 /* code below belongs to the image kernel */
 	.align PAGE_SIZE
 ENTRY(restore_registers)
-	FRAME_BEGIN
 	/* go back to the original page tables */
 	movq    %r9, %cr3
 
@@ -145,6 +144,5 @@ ENTRY(restore_registers)
 	/* tell the hibernation core that we've just restored the memory */
 	movq	%rax, in_suspend(%rip)
 
-	FRAME_END
 	ret
 ENDPROC(restore_registers)
