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Suspend: Add config option to disable the freezer if architecture wants that

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This patch makes the freezer optional for suspend to allow the
system to work (or not work) like the original PMU suspend.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Johannes Berg 2008-01-15 23:17:00 -05:00 committed by Len Brown
parent c9b6c8f68e
commit b28f508112
4 changed files with 40 additions and 3 deletions
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4
arch/powerpc/Kconfig
View file

@ -405,6 +405,10 @@ config CMDLINE
most cases you will need to specify the root device here.
if !44x || BROKEN
config ARCH_WANTS_FREEZER_CONTROL
def_bool y
depends on ADB_PMU
source kernel/power/Kconfig
endif

11
kernel/power/Kconfig
View file

@ -104,6 +104,17 @@ config SUSPEND
powered and thus its contents are preserved, such as the
suspend-to-RAM state (e.g. the ACPI S3 state).
config SUSPEND_FREEZER
bool "Enable freezer for suspend to RAM/standby" \
if ARCH_WANTS_FREEZER_CONTROL || BROKEN
depends on SUSPEND
default y
help
This allows you to turn off the freezer for suspend. If this is
done, no tasks are frozen for suspend to RAM/standby.
Turning OFF this setting is NOT recommended! If in doubt, say Y.
config HIBERNATION
bool "Hibernation (aka 'suspend to disk')"
depends on PM && SWAP && ARCH_HIBERNATION_POSSIBLE

6
kernel/power/main.c
View file

@ -181,7 +181,7 @@ static int suspend_prepare(void)
pm_prepare_console();
if (freeze_processes()) {
if (suspend_freeze_processes()) {
error = -EAGAIN;
goto Thaw;
}
@ -199,7 +199,7 @@ static int suspend_prepare(void)
return 0;
Thaw:
thaw_processes();
suspend_thaw_processes();
pm_restore_console();
Finish:
pm_notifier_call_chain(PM_POST_SUSPEND);
@ -308,7 +308,7 @@ int suspend_devices_and_enter(suspend_state_t state)
*/
static void suspend_finish(void)
{
thaw_processes();
suspend_thaw_processes();
pm_restore_console();
pm_notifier_call_chain(PM_POST_SUSPEND);
}

22
kernel/power/power.h
View file

@ -1,6 +1,7 @@
#include <linux/suspend.h>
#include <linux/suspend_ioctls.h>
#include <linux/utsname.h>
#include <linux/freezer.h>
struct swsusp_info {
struct new_utsname uts;
@ -203,3 +204,24 @@ enum {
#define TEST_MAX (__TEST_AFTER_LAST - 1)
extern int pm_test_level;
#ifdef CONFIG_SUSPEND_FREEZER
static inline int suspend_freeze_processes(void)
{
return freeze_processes();
}
static inline void suspend_thaw_processes(void)
{
thaw_processes();
}
#else
static inline int suspend_freeze_processes(void)
{
return 0;
}
static inline void suspend_thaw_processes(void)
{
}
#endif