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Hibernation: Move low level resume to disk.c

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Move the low level restore code to kernel/power/disk.c , since the
corresponding low level hibernation code is already there.

Make restore fail if device_power_down(PMSG_PRETHAW) returns an
error.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Rafael J. Wysocki
2007-12-08 02:04:21 +01:00
committed by Len Brown
parent 2ed43b6328
commit 72df68ca8e
3 changed files with 48 additions and 37 deletions
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49
kernel/power/disk.c
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@@ -274,6 +274,53 @@ int hibernation_snapshot(int platform_mode)
return error;
}
/**
* resume_target_kernel - prepare devices that need to be suspended with
* interrupts off, restore the contents of highmem that have not been
* restored yet from the image and run the low level code that will restore
* the remaining contents of memory and switch to the just restored target
* kernel.
*/
static int resume_target_kernel(void)
{
int error;
local_irq_disable();
error = device_power_down(PMSG_PRETHAW);
if (error) {
printk(KERN_ERR "Some devices failed to power down, "
"aborting resume\n");
goto Enable_irqs;
}
/* We'll ignore saved state, but this gets preempt count (etc) right */
save_processor_state();
error = restore_highmem();
if (!error) {
error = swsusp_arch_resume();
/*
* The code below is only ever reached in case of a failure.
* Otherwise execution continues at place where
* swsusp_arch_suspend() was called
*/
BUG_ON(!error);
/* This call to restore_highmem() undos the previous one */
restore_highmem();
}
/*
* The only reason why swsusp_arch_resume() can fail is memory being
* very tight, so we have to free it as soon as we can to avoid
* subsequent failures
*/
swsusp_free();
restore_processor_state();
touch_softlockup_watchdog();
device_power_up();
Enable_irqs:
local_irq_enable();
return error;
}
/**
* hibernation_restore - quiesce devices and restore the hibernation
* snapshot image. If successful, control returns in hibernation_snaphot()
@@ -297,7 +344,7 @@ int hibernation_restore(int platform_mode)
if (!error) {
error = disable_nonboot_cpus();
if (!error)
error = swsusp_resume();
error = resume_target_kernel();
enable_nonboot_cpus();
}
platform_restore_cleanup(platform_mode);