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authorRafael J. Wysocki <rjw@sisk.pl>2008-06-12 23:24:06 +0200
committerJesse Barnes <jbarnes@virtuousgeek.org>2008-06-12 14:25:09 -0700
commitd8f3de0d2412bb91639cfefc5b3c79dbf3812212 (patch)
tree05d0530d06e898b7eeac5c781ee9f00972a7f67a /kernel/power/disk.c
parent53eb2fbeb9e68e1a9a23945de8450999c46270ce (diff)
Suspend-related patches for 2.6.27
ACPI PM: Add possibility to change suspend sequence There are some systems out there that don't work correctly with our current suspend/hibernation code ordering. Provide a workaround for these systems allowing them to pass 'acpi_sleep=old_ordering' in the kernel command line so that it will use the pre-ACPI 2.0 ("old") suspend code ordering. Unfortunately, this requires us to add a platform hook to the resuming of devices for recovering the platform in case one of the device drivers' .suspend() routines returns error code. Namely, ACPI 1.0 specifies that _PTS should be called before suspending devices, but _WAK still should be called before resuming them in order to undo the changes made by _PTS. However, if there is an error during suspending devices, they are automatically resumed without returning control to the PM core, so the _WAK has to be called from within device_resume() in that cases. The patch also reorders and refactors the ACPI suspend/hibernation code to avoid duplication as far as reasonably possible. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Acked-by: Pavel Machek <pavel@suse.cz> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Diffstat (limited to 'kernel/power/disk.c')
-rw-r--r--kernel/power/disk.c28
1 files changed, 22 insertions, 6 deletions
diff --git a/kernel/power/disk.c b/kernel/power/disk.c
index d416be0efa8..f011e0870b5 100644
--- a/kernel/power/disk.c
+++ b/kernel/power/disk.c
@@ -180,6 +180,17 @@ static void platform_restore_cleanup(int platform_mode)
}
/**
+ * platform_recover - recover the platform from a failure to suspend
+ * devices.
+ */
+
+static void platform_recover(int platform_mode)
+{
+ if (platform_mode && hibernation_ops && hibernation_ops->recover)
+ hibernation_ops->recover();
+}
+
+/**
* create_image - freeze devices that need to be frozen with interrupts
* off, create the hibernation image and thaw those devices. Control
* reappears in this routine after a restore.
@@ -258,10 +269,10 @@ int hibernation_snapshot(int platform_mode)
suspend_console();
error = device_suspend(PMSG_FREEZE);
if (error)
- goto Resume_console;
+ goto Recover_platform;
if (hibernation_test(TEST_DEVICES))
- goto Resume_devices;
+ goto Recover_platform;
error = platform_pre_snapshot(platform_mode);
if (error || hibernation_test(TEST_PLATFORM))
@@ -285,11 +296,14 @@ int hibernation_snapshot(int platform_mode)
Resume_devices:
device_resume(in_suspend ?
(error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE);
- Resume_console:
resume_console();
Close:
platform_end(platform_mode);
return error;
+
+ Recover_platform:
+ platform_recover(platform_mode);
+ goto Resume_devices;
}
/**
@@ -398,8 +412,11 @@ int hibernation_platform_enter(void)
suspend_console();
error = device_suspend(PMSG_HIBERNATE);
- if (error)
- goto Resume_console;
+ if (error) {
+ if (hibernation_ops->recover)
+ hibernation_ops->recover();
+ goto Resume_devices;
+ }
error = hibernation_ops->prepare();
if (error)
@@ -428,7 +445,6 @@ int hibernation_platform_enter(void)
hibernation_ops->finish();
Resume_devices:
device_resume(PMSG_RESTORE);
- Resume_console:
resume_console();
Close:
hibernation_ops->end();