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authorRafael J. Wysocki <rjw@sisk.pl>2009-01-19 20:54:54 +0100
committerJeff Garzik <jgarzik@redhat.com>2009-01-27 02:15:45 -0500
commitabfe2d7b915c872f3a1fd203267cedebf90daa45 (patch)
treea76cc5012e6d46da44b2e861df172ceef25bd39b /kernel/power
parentf3b8436ad9a8ad36b3c9fa1fe030c7f38e5d3d0b (diff)
Hibernation: Introduce system_entering_hibernation
Introduce boolean function system_entering_hibernation() returning 'true' during the last phase of hibernation, in which devices are being put into low power states and the sleep state (for example, ACPI S4) is finally entered. Some device drivers need such a function to check if the system is in the final phase of hibernation. In particular, some SATA drivers are going to use it for blacklisting systems in which the disks should not be spun down during the last phase of hibernation (the BIOS will do that anyway). Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Diffstat (limited to 'kernel/power')
-rw-r--r--kernel/power/disk.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/kernel/power/disk.c b/kernel/power/disk.c
index 45e8541ab7e..432ee575c9e 100644
--- a/kernel/power/disk.c
+++ b/kernel/power/disk.c
@@ -71,6 +71,14 @@ void hibernation_set_ops(struct platform_hibernation_ops *ops)
mutex_unlock(&pm_mutex);
}
+static bool entering_platform_hibernation;
+
+bool system_entering_hibernation(void)
+{
+ return entering_platform_hibernation;
+}
+EXPORT_SYMBOL(system_entering_hibernation);
+
#ifdef CONFIG_PM_DEBUG
static void hibernation_debug_sleep(void)
{
@@ -411,6 +419,7 @@ int hibernation_platform_enter(void)
if (error)
goto Close;
+ entering_platform_hibernation = true;
suspend_console();
error = device_suspend(PMSG_HIBERNATE);
if (error) {
@@ -445,6 +454,7 @@ int hibernation_platform_enter(void)
Finish:
hibernation_ops->finish();
Resume_devices:
+ entering_platform_hibernation = false;
device_resume(PMSG_RESTORE);
resume_console();
Close: