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

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

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

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

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);
}

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