+
+char poweroff_cmd[POWEROFF_CMD_PATH_LEN] = "/sbin/poweroff";
+
+static void argv_cleanup(char **argv, char **envp)
+{
+ argv_free(argv);
+}
+
+/**
+ * orderly_poweroff - Trigger an orderly system poweroff
+ * @force: force poweroff if command execution fails
+ *
+ * This may be called from any context to trigger a system shutdown.
+ * If the orderly shutdown fails, it will force an immediate shutdown.
+ */
+int orderly_poweroff(bool force)
+{
+ int argc;
+ char **argv = argv_split(GFP_ATOMIC, poweroff_cmd, &argc);
+ static char *envp[] = {
+ "HOME=/",
+ "PATH=/sbin:/bin:/usr/sbin:/usr/bin",
+ NULL
+ };
+ int ret = -ENOMEM;
+ struct subprocess_info *info;
+
+ if (argv == NULL) {
+ printk(KERN_WARNING "%s failed to allocate memory for \"%s\"\n",
+ __func__, poweroff_cmd);
+ goto out;
+ }
+
+ info = call_usermodehelper_setup(argv[0], argv, envp);
+ if (info == NULL) {
+ argv_free(argv);
+ goto out;
+ }
+
+ call_usermodehelper_setcleanup(info, argv_cleanup);
+
+ ret = call_usermodehelper_exec(info, UMH_NO_WAIT);
+
+ out:
+ if (ret && force) {
+ printk(KERN_WARNING "Failed to start orderly shutdown: "
+ "forcing the issue\n");
+
+ /* I guess this should try to kick off some daemon to
+ sync and poweroff asap. Or not even bother syncing
+ if we're doing an emergency shutdown? */
+ emergency_sync();
+ kernel_power_off();
+ }
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(orderly_poweroff);