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authorRafael J. Wysocki <rjw@sisk.pl>2007-10-18 03:04:56 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-18 14:37:20 -0700
commit9cd9a0058dd35268b24fa16795a92c800f4086d4 (patch)
tree2525a95542eaa16a9aea865e8078cf66f3274e18 /fs/aio.c
parentc7e0831d385d620a58d95b25e4afa9b643f9a411 (diff)
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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>
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