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author | Rafael J. Wysocki <rjw@sisk.pl> | 2007-10-18 06:04:56 -0400 |
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committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-10-18 17:37:20 -0400 |
commit | 9cd9a0058dd35268b24fa16795a92c800f4086d4 (patch) | |
tree | 2525a95542eaa16a9aea865e8078cf66f3274e18 /kernel/fork.c | |
parent | c7e0831d385d620a58d95b25e4afa9b643f9a411 (diff) |
Hibernation: Enter platform hibernation state in a consistent way
Make hibernation_platform_enter() execute the enter-a-sleep-state sequence
instead of the mixed shutdown-with-entering-S4 thing.
Replace the shutting down of devices done by kernel_shutdown_prepare(), before
entering the ACPI S4 sleep state, with suspending them and the shutting down
of sysdevs with calling device_power_down(PMSG_SUSPEND) (just like before
entering S1 or S3, but the target state is now S4). Also, disable the
nonboot CPUs before entering the sleep state (S4), which generally always is a
good idea.
This is known to fix the "double disk spin down during hibernation" on some
machines, eg. HPC nx6325 (ref. http://lkml.org/lkml/2007/8/7/316 and the
following thread). Moreover, it has been reported to make
/sys/class/rtc/rtc0/wakealarm work correctly with hibernation for some users.
It also generally causes the hibernation state (ACPI S4) to be entered faster.
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/fork.c')
0 files changed, 0 insertions, 0 deletions