]> err.no Git - linux-2.6/commit
pm: acpi hibernation: utilize hardware signature
authorShaohua Li <shaohua.li@intel.com>
Thu, 24 Jul 2008 04:28:41 +0000 (21:28 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Thu, 24 Jul 2008 17:47:24 +0000 (10:47 -0700)
commitbdfe6b7c681669148dae4db27eb24ee5408ba371
tree644b84a7e4a329a635d9a9bc02102424cfb616e2
parent2f15fc4bdf91eb399da3f47a09c55831d9f22826
pm: acpi hibernation: utilize hardware signature

ACPI defines a hardware signature.  BIOS calculates the signature according to
hardware configure and if hardware changes while hibernated, the signature
will change.  In that case, S4 resume should fail.

Still, there may be systems on which this mechanism does not work correctly,
so it is better to provide a workaround for them.  For this reason, add a new
switch to the acpi_sleep= command line argument allowing one to disable
hardware signature checking.

[shaohua.li@intel.com: build fix]
Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Len Brown <lenb@kernel.org>
Acked-by: Pavel Machek <pavel@ucw.cz>
Cc: <Valdis.Kletnieks@vt.edu>
Cc: Shaohua Li <shaohua.li@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Documentation/kernel-parameters.txt
arch/x86/kernel/acpi/sleep.c
drivers/acpi/sleep/main.c
include/linux/acpi.h