[linux-pm] [PATCH v3] PM: make freezer optional for suspend

Johannes Berg johannes at sipsolutions.net
Tue Dec 11 06:19:16 PST 2007


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 at sipsolutions.net>
---
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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