3 files changed, 74 insertions, 0 deletions

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 20341480bb54..c2024d86fb12 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1119,6 +1119,30 @@ config CPU_NOTIFIER_ERROR_INJECT
 
           If unsure, say N.
 
+config PM_NOTIFIER_ERROR_INJECT
+        tristate "PM notifier error injection module"
+        depends on PM && NOTIFIER_ERROR_INJECTION
+        default m if PM_DEBUG
+        help
+          This option provides the ability to inject artifical errors to
+          PM notifier chain callbacks.  It is controlled through debugfs
+          interface /sys/kernel/debug/notifier-error-inject/pm
+
+          If the notifier call chain should be failed with some events
+          notified, write the error code to "actions/<notifier event>/error".
+
+          Example: Inject PM suspend error (-12 = -ENOMEM)
+
+          # cd /sys/kernel/debug/notifier-error-inject/pm/
+          # echo -12 > actions/PM_SUSPEND_PREPARE/error
+          # echo mem > /sys/power/state
+          bash: echo: write error: Cannot allocate memory
+
+          To compile this code as a module, choose M here: the module will
+          be called pm-notifier-error-inject.
+
+          If unsure, say N.
+
 config FAULT_INJECTION
         bool "Fault-injection framework"
         depends on DEBUG_KERNEL
diff --git a/lib/Makefile b/lib/Makefile
index 71acfa4489f3..c32c66473ba1 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -92,6 +92,7 @@ obj-$(CONFIG_IOMMU_HELPER) += iommu-helper.o
 obj-$(CONFIG_FAULT_INJECTION) += fault-inject.o
 obj-$(CONFIG_NOTIFIER_ERROR_INJECTION) += notifier-error-inject.o
 obj-$(CONFIG_CPU_NOTIFIER_ERROR_INJECT) += cpu-notifier-error-inject.o
+obj-$(CONFIG_PM_NOTIFIER_ERROR_INJECT) += pm-notifier-error-inject.o
 
 lib-$(CONFIG_GENERIC_BUG) += bug.o
 
diff --git a/lib/pm-notifier-error-inject.c b/lib/pm-notifier-error-inject.c
new file mode 100644
index 000000000000..c094b2dedc23
--- /dev/null
+++ b/lib/pm-notifier-error-inject.c
@@ -0,0 +1,49 @@
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/suspend.h>
+
+#include "notifier-error-inject.h"
+
+static int priority;
+module_param(priority, int, 0);
+MODULE_PARM_DESC(priority, "specify PM notifier priority");
+
+static struct notifier_err_inject pm_notifier_err_inject = {
+        .actions = {
+                { NOTIFIER_ERR_INJECT_ACTION(PM_HIBERNATION_PREPARE) },
+                { NOTIFIER_ERR_INJECT_ACTION(PM_SUSPEND_PREPARE) },
+                { NOTIFIER_ERR_INJECT_ACTION(PM_RESTORE_PREPARE) },
+                {}
+        }
+};
+
+static struct dentry *dir;
+
+static int err_inject_init(void)
+{
+        int err;
+
+        dir = notifier_err_inject_init("pm", notifier_err_inject_dir,
+                                        &pm_notifier_err_inject, priority);
+        if (IS_ERR(dir))
+                return PTR_ERR(dir);
+
+        err = register_pm_notifier(&pm_notifier_err_inject.nb);
+        if (err)
+                debugfs_remove_recursive(dir);
+
+        return err;
+}
+
+static void err_inject_exit(void)
+{
+        unregister_pm_notifier(&pm_notifier_err_inject.nb);
+        debugfs_remove_recursive(dir);
+}
+
+module_init(err_inject_init);
+module_exit(err_inject_exit);
+
+MODULE_DESCRIPTION("PM notifier error injection module");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Akinobu Mita <akinobu.mita@gmail.com>");