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@xxxxxxxxxxxxxxxx>
---
In a quick test, playing sound across suspend failed to work,
it usually works when the freezer is enabled (unless you use
gstreamer.)
arch/powerpc/Kconfig | 4 ++++
kernel/power/Kconfig | 11 +++++++++++
kernel/power/main.c | 6 +++---
kernel/power/power.h | 22 ++++++++++++++++++++++
4 files changed, 40 insertions(+), 3 deletions(-)
--- everything.orig/kernel/power/main.c 2007-12-11 15:13:05.726937988 +0100
+++ everything/kernel/power/main.c 2007-12-11 15:16:21.816910590 +0100
@@ -79,7 +79,7 @@ static int suspend_prepare(void)
pm_prepare_console();
- if (freeze_processes()) {
+ if (suspend_freeze_processes()) {
error = -EAGAIN;
goto Thaw;
}
@@ -97,7 +97,7 @@ static int suspend_prepare(void)
return 0;
Thaw:
- thaw_processes();
+ suspend_thaw_processes();
pm_restore_console();
Finish:
pm_notifier_call_chain(PM_POST_SUSPEND);
@@ -191,7 +191,7 @@ int suspend_devices_and_enter(suspend_st
*/
static void suspend_finish(void)
{
- thaw_processes();
+ suspend_thaw_processes();
pm_restore_console();
pm_notifier_call_chain(PM_POST_SUSPEND);
}
--- everything.orig/kernel/power/Kconfig 2007-12-11 15:13:05.856915473 +0100
+++ everything/kernel/power/Kconfig 2007-12-11 15:13:40.306913303 +0100
@@ -97,6 +97,17 @@ config SUSPEND
powered and thus its contents are preserved, such as the
suspend-to-RAM state (i.e. 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_UP_POSSIBLE
bool
depends on X86 || PPC64_SWSUSP || PPC32
--- everything.orig/arch/powerpc/Kconfig 2007-12-11 15:13:05.926915907 +0100
+++ everything/arch/powerpc/Kconfig 2007-12-11 15:13:40.316913954 +0100
@@ -365,6 +365,10 @@ 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
--- everything.orig/kernel/power/power.h 2007-12-11 15:14:02.066914117 +0100
+++ everything/kernel/power/power.h 2007-12-11 15:17:10.136910319 +0100
@@ -1,5 +1,6 @@
#include <linux/suspend.h>
#include <linux/utsname.h>
+#include <linux/freezer.h>
struct swsusp_info {
struct new_utsname uts;
@@ -211,3 +212,24 @@ static inline int pm_notifier_call_chain
return (blocking_notifier_call_chain(&pm_chain_head, val, NULL)
== NOTIFY_BAD) ? -EINVAL : 0;
}
+
+#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
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