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authorRafael J. Wysocki <rjw@sisk.pl>2007-10-18 03:04:55 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-18 14:37:20 -0700
commitc7e0831d385d620a58d95b25e4afa9b643f9a411 (patch)
treed3dde7c47276aeb6fad0a1f25fa6b74cc5dacfc1 /kernel/power/swsusp.c
parentefa4d2fb047b25a6be67fe92178a2a78da6b3f6a (diff)
Hibernation: Check if ACPI is enabled during restore in the right place
The following scenario leads to total confusion of the platform firmware on some boxes (eg. HPC nx6325): * Hibernate with ACPI enabled * Resume passing "acpi=off" to the boot kernel To prevent this from happening it's necessary to check if ACPI is enabled (and enable it if that's not the case) _right_ _after_ control has been transfered from the boot kernel to the image kernel, before device_power_up() is called (ie. with interrupts disabled).  Enabling ACPI after calling device_power_up() turns out to be insufficient. For this reason, introduce new hibernation callback ->leave() that will be executed before device_power_up() by the restored image kernel.  To make it work, it also is necessary to move swsusp_suspend() from swsusp.c to disk.c (it's name is changed to "create_image", which is more up to the point). 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/power/swsusp.c')
-rw-r--r--kernel/power/swsusp.c33
1 files changed, 0 insertions, 33 deletions
diff --git a/kernel/power/swsusp.c b/kernel/power/swsusp.c
index 5da304c8f1f6..e1722d3155f1 100644
--- a/kernel/power/swsusp.c
+++ b/kernel/power/swsusp.c
@@ -270,39 +270,6 @@ int swsusp_shrink_memory(void)
return 0;
}
-int swsusp_suspend(void)
-{
- int error;
-
- if ((error = arch_prepare_suspend()))
- return error;
-
- local_irq_disable();
- /* At this point, device_suspend() has been called, but *not*
- * device_power_down(). We *must* device_power_down() now.
- * Otherwise, drivers for some devices (e.g. interrupt controllers)
- * become desynchronized with the actual state of the hardware
- * at resume time, and evil weirdness ensues.
- */
- if ((error = device_power_down(PMSG_FREEZE))) {
- printk(KERN_ERR "Some devices failed to power down, aborting suspend\n");
- goto Enable_irqs;
- }
-
- save_processor_state();
- if ((error = swsusp_arch_suspend()))
- printk(KERN_ERR "Error %d suspending\n", error);
- /* Restore control flow magically appears here */
- restore_processor_state();
- /* NOTE: device_power_up() is just a resume() for devices
- * that suspended with irqs off ... no overall powerup.
- */
- device_power_up();
- Enable_irqs:
- local_irq_enable();
- return error;
-}
-
int swsusp_resume(void)
{
int error;