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Commit 900af0d9 authored by Rafael J. Wysocki's avatar Rafael J. Wysocki
Browse files

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: default avatarRafael J. Wysocki <rjw@sisk.pl>
Acked-by: default avatarIngo Molnar <mingo@elte.hu>
parent 2ed8d2b3

kernel/power/main.c

+22 −16
Original line number Diff line number Diff line
@@ -297,6 +297,19 @@ static int suspend_enter(suspend_state_t state) 
		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();

	BUG_ON(!irqs_disabled());
@@ -310,6 +323,14 @@ static int suspend_enter(suspend_state_t state) 
	arch_suspend_enable_irqs();

	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);



 Done:
@@ -346,23 +367,8 @@ int suspend_devices_and_enter(suspend_state_t state) 
	if (suspend_test(TEST_DEVICES))

		goto Recover_platform;



	if (suspend_ops->prepare) {

		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:

	suspend_test_start();

	device_resume(PMSG_RESUME);