From 1f0b63866fc1be700260547be8edf8e6f0af37f2 Mon Sep 17 00:00:00 2001
From: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Date: Thu, 15 May 2014 23:29:57 +0200
Subject: [PATCH] ACPI / PM: Hold ACPI scan lock over the "freeze" sleep state

The "freeze" sleep state suffers from the same issue that was
addressed by commit ad07277e82de (ACPI / PM: Hold acpi_scan_lock over
system PM transitions) for ACPI sleep states, that is, things break
if ->remove() is called for devices whose system resume callbacks
haven't been executed yet.

It also can be addressed in the same way, by holding the ACPI scan
lock over the "freeze" sleep state and PM transitions to and from
that state, but ->begin() and ->end() platform operations for the
"freeze" sleep state are needed for this purpose.

This change has been tested on Acer Aspire S5 with Thunderbolt.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/acpi/sleep.c    | 18 ++++++++++++++++++
 include/linux/suspend.h |  7 +++++++
 kernel/power/suspend.c  | 15 +++++++++++++++
 3 files changed, 40 insertions(+)

diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c
index 2281ca3..c11e379 100644
--- a/drivers/acpi/sleep.c
+++ b/drivers/acpi/sleep.c
@@ -612,6 +612,22 @@ static const struct platform_suspend_ops acpi_suspend_ops_old = {
 	.recover = acpi_pm_finish,
 };
 
+static int acpi_freeze_begin(void)
+{
+	acpi_scan_lock_acquire();
+	return 0;
+}
+
+static void acpi_freeze_end(void)
+{
+	acpi_scan_lock_release();
+}
+
+static const struct platform_freeze_ops acpi_freeze_ops = {
+	.begin = acpi_freeze_begin,
+	.end = acpi_freeze_end,
+};
+
 static void acpi_sleep_suspend_setup(void)
 {
 	int i;
@@ -622,7 +638,9 @@ static void acpi_sleep_suspend_setup(void)
 
 	suspend_set_ops(old_suspend_ordering ?
 		&acpi_suspend_ops_old : &acpi_suspend_ops);
+	freeze_set_ops(&acpi_freeze_ops);
 }
+
 #else /* !CONFIG_SUSPEND */
 static inline void acpi_sleep_suspend_setup(void) {}
 #endif /* !CONFIG_SUSPEND */
diff --git a/include/linux/suspend.h b/include/linux/suspend.h
index f73cabf..91d66fd 100644
--- a/include/linux/suspend.h
+++ b/include/linux/suspend.h
@@ -187,6 +187,11 @@ struct platform_suspend_ops {
 	void (*recover)(void);
 };
 
+struct platform_freeze_ops {
+	int (*begin)(void);
+	void (*end)(void);
+};
+
 #ifdef CONFIG_SUSPEND
 /**
  * suspend_set_ops - set platform dependent suspend operations
@@ -194,6 +199,7 @@ struct platform_suspend_ops {
  */
 extern void suspend_set_ops(const struct platform_suspend_ops *ops);
 extern int suspend_valid_only_mem(suspend_state_t state);
+extern void freeze_set_ops(const struct platform_freeze_ops *ops);
 extern void freeze_wake(void);
 
 /**
@@ -220,6 +226,7 @@ extern int pm_suspend(suspend_state_t state);
 
 static inline void suspend_set_ops(const struct platform_suspend_ops *ops) {}
 static inline int pm_suspend(suspend_state_t state) { return -ENOSYS; }
+static inline void freeze_set_ops(const struct platform_freeze_ops *ops) {}
 static inline void freeze_wake(void) {}
 #endif /* !CONFIG_SUSPEND */
 
diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c
index 8233cd4..73a905f 100644
--- a/kernel/power/suspend.c
+++ b/kernel/power/suspend.c
@@ -38,6 +38,7 @@ const char *const pm_states[PM_SUSPEND_MAX] = {
 };
 
 static const struct platform_suspend_ops *suspend_ops;
+static const struct platform_freeze_ops *freeze_ops;
 
 static bool need_suspend_ops(suspend_state_t state)
 {
@@ -47,6 +48,13 @@ static bool need_suspend_ops(suspend_state_t state)
 static DECLARE_WAIT_QUEUE_HEAD(suspend_freeze_wait_head);
 static bool suspend_freeze_wake;
 
+void freeze_set_ops(const struct platform_freeze_ops *ops)
+{
+	lock_system_sleep();
+	freeze_ops = ops;
+	unlock_system_sleep();
+}
+
 static void freeze_begin(void)
 {
 	suspend_freeze_wake = false;
@@ -269,6 +277,10 @@ int suspend_devices_and_enter(suspend_state_t state)
 		error = suspend_ops->begin(state);
 		if (error)
 			goto Close;
+	} else if (state == PM_SUSPEND_FREEZE && freeze_ops->begin) {
+		error = freeze_ops->begin();
+		if (error)
+			goto Close;
 	}
 	suspend_console();
 	suspend_test_start();
@@ -294,6 +306,9 @@ int suspend_devices_and_enter(suspend_state_t state)
  Close:
 	if (need_suspend_ops(state) && suspend_ops->end)
 		suspend_ops->end();
+	else if (state == PM_SUSPEND_FREEZE && freeze_ops->end)
+		freeze_ops->end();
+
 	trace_machine_suspend(PWR_EVENT_EXIT);
 	return error;
 
-- 
2.7.4