diff --git a/Documentation/power/basic-pm-debugging.txt b/Documentation/power/basic-pm-debugging.txt
index ddd7817..acbd3e0 100644
--- a/Documentation/power/basic-pm-debugging.txt
+++ b/Documentation/power/basic-pm-debugging.txt
@@ -201,3 +201,22 @@ case, you may be able to search for failing drivers by following the procedure
 analogous to the one described in section 1.  If you find some failing drivers,
 you will have to unload them every time before an STR transition (ie. before
 you run s2ram), and please report the problems with them.
+
+There is a debugfs entry which shows the suspend to RAM statistics. Here is an
+example of its output.
+	# mount -t debugfs none /sys/kernel/debug
+	# cat /sys/kernel/debug/suspend_stats
+	success: 20
+	fail: 5
+	failed_freeze: 0
+	failed_prepare: 0
+	failed_suspend: 5
+	failed_suspend_noirq: 0
+	failed_resume: 0
+	failed_resume_noirq: 0
+	failed_devs:
+	  last_failed: alarm
+		       adc
+Field success means the success number of suspend to RAM, and field fail means
+the failure number. Others are the failure number of different steps of suspend
+to RAM. suspend_stats just lists the last 2 failed devices.
diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c
index a854591..111f86c 100644
--- a/drivers/base/power/main.c
+++ b/drivers/base/power/main.c
@@ -46,6 +46,7 @@ LIST_HEAD(dpm_prepared_list);
 LIST_HEAD(dpm_suspended_list);
 LIST_HEAD(dpm_noirq_list);
 
+struct suspend_stats suspend_stats;
 static DEFINE_MUTEX(dpm_list_mtx);
 static pm_message_t pm_transition;
 
@@ -180,6 +181,15 @@ static void initcall_debug_report(struct device *dev, ktime_t calltime,
 	}
 }
 
+static void dpm_save_dev_name(const char *name)
+{
+	strlcpy(suspend_stats.failed_devs[suspend_stats.last_failed],
+		name,
+		sizeof(suspend_stats.failed_devs[0]));
+	suspend_stats.last_failed++;
+	suspend_stats.last_failed %= REC_FAILED_DEV_NUM;
+}
+
 /**
  * dpm_wait - Wait for a PM operation to complete.
  * @dev: Device to wait for.
@@ -464,8 +474,11 @@ void dpm_resume_noirq(pm_message_t state)
 		mutex_unlock(&dpm_list_mtx);
 
 		error = device_resume_noirq(dev, state);
-		if (error)
+		if (error) {
+			suspend_stats.failed_resume_noirq++;
+			dpm_save_dev_name(dev_name(dev));
 			pm_dev_err(dev, state, " early", error);
+		}
 
 		mutex_lock(&dpm_list_mtx);
 		put_device(dev);
@@ -626,8 +639,11 @@ void dpm_resume(pm_message_t state)
 			mutex_unlock(&dpm_list_mtx);
 
 			error = device_resume(dev, state, false);
-			if (error)
+			if (error) {
+				suspend_stats.failed_resume++;
+				dpm_save_dev_name(dev_name(dev));
 				pm_dev_err(dev, state, "", error);
+			}
 
 			mutex_lock(&dpm_list_mtx);
 		}
@@ -802,6 +818,8 @@ int dpm_suspend_noirq(pm_message_t state)
 		mutex_lock(&dpm_list_mtx);
 		if (error) {
 			pm_dev_err(dev, state, " late", error);
+			suspend_stats.failed_suspend_noirq++;
+			dpm_save_dev_name(dev_name(dev));
 			put_device(dev);
 			break;
 		}
@@ -923,8 +941,10 @@ static void async_suspend(void *data, async_cookie_t cookie)
 	int error;
 
 	error = __device_suspend(dev, pm_transition, true);
-	if (error)
+	if (error) {
+		dpm_save_dev_name(dev_name(dev));
 		pm_dev_err(dev, pm_transition, " async", error);
+	}
 
 	put_device(dev);
 }
@@ -967,6 +987,7 @@ int dpm_suspend(pm_message_t state)
 		mutex_lock(&dpm_list_mtx);
 		if (error) {
 			pm_dev_err(dev, state, "", error);
+			dpm_save_dev_name(dev_name(dev));
 			put_device(dev);
 			break;
 		}
@@ -980,7 +1001,9 @@ int dpm_suspend(pm_message_t state)
 	async_synchronize_full();
 	if (!error)
 		error = async_error;
-	if (!error)
+	if (error)
+		suspend_stats.failed_suspend++;
+	else
 		dpm_show_time(starttime, state, NULL);
 	return error;
 }
@@ -1088,7 +1111,9 @@ int dpm_suspend_start(pm_message_t state)
 	int error;
 
 	error = dpm_prepare(state);
-	if (!error)
+	if (error)
+		suspend_stats.failed_prepare++;
+	else
 		error = dpm_suspend(state);
 	return error;
 }
diff --git a/include/linux/suspend.h b/include/linux/suspend.h
index 6bbcef2..6a8ff23 100644
--- a/include/linux/suspend.h
+++ b/include/linux/suspend.h
@@ -34,6 +34,22 @@ typedef int __bitwise suspend_state_t;
 #define PM_SUSPEND_MEM		((__force suspend_state_t) 3)
 #define PM_SUSPEND_MAX		((__force suspend_state_t) 4)
 
+struct suspend_stats {
+	int	success;
+	int	fail;
+	int	failed_freeze;
+	int	failed_prepare;
+	int	failed_suspend;
+	int	failed_suspend_noirq;
+	int	failed_resume;
+	int	failed_resume_noirq;
+#define	REC_FAILED_DEV_NUM	2
+	char	failed_devs[REC_FAILED_DEV_NUM][40];
+	int	last_failed;
+};
+
+extern struct suspend_stats suspend_stats;
+
 /**
  * struct platform_suspend_ops - Callbacks for managing platform dependent
  *	system sleep states.
diff --git a/kernel/power/main.c b/kernel/power/main.c
index 6c601f8..0977f5d 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -12,6 +12,8 @@
 #include <linux/string.h>
 #include <linux/resume-trace.h>
 #include <linux/workqueue.h>
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
 
 #include "power.h"
 
@@ -133,6 +135,59 @@ power_attr(pm_test);
 
 #endif /* CONFIG_PM_SLEEP */
 
+#ifdef CONFIG_DEBUG_FS
+static int suspend_stats_show(struct seq_file *s, void *unused)
+{
+	int i, index, last_index;
+
+	last_index = suspend_stats.last_failed + REC_FAILED_DEV_NUM - 1;
+	last_index %= REC_FAILED_DEV_NUM;
+	seq_printf(s, "%s: %d\n%s: %d\n%s: %d\n%s: %d\n"
+			"%s: %d\n%s: %d\n%s: %d\n%s: %d\n",
+			"success", suspend_stats.success,
+			"fail", suspend_stats.fail,
+			"failed_freeze", suspend_stats.failed_freeze,
+			"failed_prepare", suspend_stats.failed_prepare,
+			"failed_suspend", suspend_stats.failed_suspend,
+			"failed_suspend_noirq",
+				suspend_stats.failed_suspend_noirq,
+			"failed_resume", suspend_stats.failed_resume,
+			"failed_resume_noirq",
+				suspend_stats.failed_resume_noirq);
+	seq_printf(s,	"failed_devs:\n  last_failed:\t%s\n",
+			suspend_stats.failed_devs[last_index]);
+	for (i = 1; i < REC_FAILED_DEV_NUM; i++) {
+		index = last_index + REC_FAILED_DEV_NUM - i;
+		index %= REC_FAILED_DEV_NUM;
+		seq_printf(s, "\t\t%s\n",
+			suspend_stats.failed_devs[index]);
+	}
+
+	return 0;
+}
+
+static int suspend_stats_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, suspend_stats_show, NULL);
+}
+
+static const struct file_operations suspend_stats_operations = {
+	.open           = suspend_stats_open,
+	.read           = seq_read,
+	.llseek         = seq_lseek,
+	.release        = single_release,
+};
+
+static int __init pm_debugfs_init(void)
+{
+	debugfs_create_file("suspend_stats", S_IFREG | S_IRUGO,
+			NULL, NULL, &suspend_stats_operations);
+	return 0;
+}
+
+late_initcall(pm_debugfs_init);
+#endif /* CONFIG_DEBUG_FS */
+
 struct kobject *power_kobj;
 
 /**
@@ -194,6 +249,10 @@ static ssize_t state_store(struct kobject *kobj, struct kobj_attribute *attr,
 	}
 	if (state < PM_SUSPEND_MAX && *s)
 		error = enter_state(state);
+		if (error)
+			suspend_stats.fail++;
+		else
+			suspend_stats.success++;
 #endif
 
  Exit:
diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c
index b6b71ad..e5197a0 100644
--- a/kernel/power/suspend.c
+++ b/kernel/power/suspend.c
@@ -104,7 +104,9 @@ static int suspend_prepare(void)
 		goto Finish;
 
 	error = suspend_freeze_processes();
-	if (!error)
+	if (error)
+		suspend_stats.failed_freeze++;
+	else
 		return 0;
 
 	suspend_thaw_processes();
@@ -315,8 +317,15 @@ int enter_state(suspend_state_t state)
  */
 int pm_suspend(suspend_state_t state)
 {
-	if (state > PM_SUSPEND_ON && state <= PM_SUSPEND_MAX)
-		return enter_state(state);
+	int ret;
+	if (state > PM_SUSPEND_ON && state <= PM_SUSPEND_MAX) {
+		ret = enter_state(state);
+		if (ret)
+			suspend_stats.fail++;
+		else
+			suspend_stats.success++;
+		return ret;
+	}
 	return -EINVAL;
 }
 EXPORT_SYMBOL(pm_suspend);
