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authorRafael J. Wysocki <rjw@sisk.pl>2009-03-16 22:34:26 +0100
committerRafael J. Wysocki <rjw@sisk.pl>2009-03-30 21:46:54 +0200
commit4aecd6718939eb3c4145b248369b65f7483a8a02 (patch)
tree20030736ca8e762b5de7ad2e66c39321c9ef94f5
parent900af0d973856d6feb6fc088c2d0d3fde57707d3 (diff)
downloadlinux-linaro-stable-4aecd6718939eb3c4145b248369b65f7483a8a02.tar.gz
PM: Change hibernation code ordering
Change the ordering of the hibernation core code so that the platform "prepare" callbacks are executed and the nonboot CPUs are disabled after calling device drivers' "late suspend" methods. This change (along with the previous analogous change of the suspend core code) 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>
-rw-r--r--kernel/power/disk.c109
1 files changed, 61 insertions, 48 deletions
diff --git a/kernel/power/disk.c b/kernel/power/disk.c
index 320bb0949bdf..e886d1332a10 100644
--- a/kernel/power/disk.c
+++ b/kernel/power/disk.c
@@ -228,13 +228,22 @@ static int create_image(int platform_mode)
goto Unlock;
}
+ error = platform_pre_snapshot(platform_mode);
+ if (error || hibernation_test(TEST_PLATFORM))
+ goto Platform_finish;
+
+ error = disable_nonboot_cpus();
+ if (error || hibernation_test(TEST_CPUS)
+ || hibernation_testmode(HIBERNATION_TEST))
+ goto Enable_cpus;
+
local_irq_disable();
sysdev_suspend(PMSG_FREEZE);
if (error) {
printk(KERN_ERR "PM: Some devices failed to power down, "
"aborting hibernation\n");
- goto Power_up_devices;
+ goto Enable_irqs;
}
if (hibernation_test(TEST_CORE))
@@ -250,15 +259,22 @@ static int create_image(int platform_mode)
restore_processor_state();
if (!in_suspend)
platform_leave(platform_mode);
+
Power_up:
sysdev_resume();
/* NOTE: device_power_up() is just a resume() for devices
* that suspended with irqs off ... no overall powerup.
*/
- Power_up_devices:
+ Enable_irqs:
local_irq_enable();
+ Enable_cpus:
+ enable_nonboot_cpus();
+
+ Platform_finish:
+ platform_finish(platform_mode);
+
device_power_up(in_suspend ?
(error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE);
@@ -298,25 +314,9 @@ int hibernation_snapshot(int platform_mode)
if (hibernation_test(TEST_DEVICES))
goto Recover_platform;
- error = platform_pre_snapshot(platform_mode);
- if (error || hibernation_test(TEST_PLATFORM))
- goto Finish;
-
- error = disable_nonboot_cpus();
- if (!error) {
- if (hibernation_test(TEST_CPUS))
- goto Enable_cpus;
-
- if (hibernation_testmode(HIBERNATION_TEST))
- goto Enable_cpus;
+ error = create_image(platform_mode);
+ /* Control returns here after successful restore */
- error = create_image(platform_mode);
- /* Control returns here after successful restore */
- }
- Enable_cpus:
- enable_nonboot_cpus();
- Finish:
- platform_finish(platform_mode);
Resume_devices:
device_resume(in_suspend ?
(error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE);
@@ -338,7 +338,7 @@ int hibernation_snapshot(int platform_mode)
* kernel.
*/
-static int resume_target_kernel(void)
+static int resume_target_kernel(bool platform_mode)
{
int error;
@@ -351,9 +351,20 @@ static int resume_target_kernel(void)
goto Unlock;
}
+ error = platform_pre_restore(platform_mode);
+ if (error)
+ goto Cleanup;
+
+ error = disable_nonboot_cpus();
+ if (error)
+ goto Enable_cpus;
+
local_irq_disable();
- sysdev_suspend(PMSG_QUIESCE);
+ error = sysdev_suspend(PMSG_QUIESCE);
+ if (error)
+ goto Enable_irqs;
+
/* We'll ignore saved state, but this gets preempt count (etc) right */
save_processor_state();
error = restore_highmem();
@@ -379,8 +390,15 @@ static int resume_target_kernel(void)
sysdev_resume();
+ Enable_irqs:
local_irq_enable();
+ Enable_cpus:
+ enable_nonboot_cpus();
+
+ Cleanup:
+ platform_restore_cleanup(platform_mode);
+
device_power_up(PMSG_RECOVER);
Unlock:
@@ -405,19 +423,10 @@ int hibernation_restore(int platform_mode)
pm_prepare_console();
suspend_console();
error = device_suspend(PMSG_QUIESCE);
- if (error)
- goto Finish;
-
- error = platform_pre_restore(platform_mode);
if (!error) {
- error = disable_nonboot_cpus();
- if (!error)
- error = resume_target_kernel();
- enable_nonboot_cpus();
+ error = resume_target_kernel(platform_mode);
+ device_resume(PMSG_RECOVER);
}
- platform_restore_cleanup(platform_mode);
- device_resume(PMSG_RECOVER);
- Finish:
resume_console();
pm_restore_console();
return error;
@@ -453,34 +462,38 @@ int hibernation_platform_enter(void)
goto Resume_devices;
}
+ device_pm_lock();
+
+ error = device_power_down(PMSG_HIBERNATE);
+ if (error)
+ goto Unlock;
+
error = hibernation_ops->prepare();
if (error)
- goto Resume_devices;
+ goto Platofrm_finish;
error = disable_nonboot_cpus();
if (error)
- goto Finish;
-
- device_pm_lock();
-
- error = device_power_down(PMSG_HIBERNATE);
- if (!error) {
- local_irq_disable();
- sysdev_suspend(PMSG_HIBERNATE);
- hibernation_ops->enter();
- /* We should never get here */
- while (1);
- }
+ goto Platofrm_finish;
- device_pm_unlock();
+ local_irq_disable();
+ sysdev_suspend(PMSG_HIBERNATE);
+ hibernation_ops->enter();
+ /* We should never get here */
+ while (1);
/*
* We don't need to reenable the nonboot CPUs or resume consoles, since
* the system is going to be halted anyway.
*/
- Finish:
+ Platofrm_finish:
hibernation_ops->finish();
+ device_power_up(PMSG_RESTORE);
+
+ Unlock:
+ device_pm_unlock();
+
Resume_devices:
entering_platform_hibernation = false;
device_resume(PMSG_RESTORE);