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PM: Change suspend code ordering 

Change the ordering of the suspend core code so that the platform
"prepare" callback is executed and the nonboot CPUs are disabled
after calling device drivers' "late suspend" methods.

This change will allow us to rework the PCI PM core so that the power
state of devices is changed in the "late" phase of suspend (and
analogously in the "early" phase of resume), which in turn will allow
us to avoid the race condition where a device using shared interrupts
is put into a low power state with interrupts enabled and then an
interrupt (for another device) comes in and confuses its driver.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Rafael J. Wysocki 2009-03-16 22:34:15 +01:00
parent 2ed8d2b3a8
commit 900af0d973
1 changed files with 22 additions and 16 deletions
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38
kernel/power/main.c
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@ -297,6 +297,19 @@ static int suspend_enter(suspend_state_t state)
goto Done; goto Done;
} }
if (suspend_ops->prepare) {
error = suspend_ops->prepare();
if (error)
goto Power_up_devices;
}
if (suspend_test(TEST_PLATFORM))
goto Platfrom_finish;
error = disable_nonboot_cpus();
if (error || suspend_test(TEST_CPUS))
goto Enable_cpus;
arch_suspend_disable_irqs(); arch_suspend_disable_irqs();
BUG_ON(!irqs_disabled()); BUG_ON(!irqs_disabled());
@ -310,6 +323,14 @@ static int suspend_enter(suspend_state_t state)
arch_suspend_enable_irqs(); arch_suspend_enable_irqs();
BUG_ON(irqs_disabled()); BUG_ON(irqs_disabled());
Enable_cpus:
enable_nonboot_cpus();
Platfrom_finish:
if (suspend_ops->finish)
suspend_ops->finish();
Power_up_devices:
device_power_up(PMSG_RESUME); device_power_up(PMSG_RESUME);
Done: Done:
@ -346,23 +367,8 @@ int suspend_devices_and_enter(suspend_state_t state)
if (suspend_test(TEST_DEVICES)) if (suspend_test(TEST_DEVICES))
goto Recover_platform; goto Recover_platform;
if (suspend_ops->prepare) { suspend_enter(state);
error = suspend_ops->prepare();
if (error)
goto Resume_devices;
}
if (suspend_test(TEST_PLATFORM))
goto Finish;
error = disable_nonboot_cpus();
if (!error && !suspend_test(TEST_CPUS))
suspend_enter(state);
enable_nonboot_cpus();
Finish:
if (suspend_ops->finish)
suspend_ops->finish();
Resume_devices: Resume_devices:
suspend_test_start(); suspend_test_start();
device_resume(PMSG_RESUME); device_resume(PMSG_RESUME);