+int call_usermodehelper_pipe(char *path, char **argv, char **envp,
+ struct file **filp)
+{
+ DECLARE_COMPLETION(done);
+ struct subprocess_info sub_info = {
+ .complete = &done,
+ .path = path,
+ .argv = argv,
+ .envp = envp,
+ .retval = 0,
+ };
+ struct file *f;
+ DECLARE_WORK(work, __call_usermodehelper, &sub_info);
+
+ if (!khelper_wq)
+ return -EBUSY;
+
+ if (path[0] == '\0')
+ return 0;
+
+ f = create_write_pipe();
+ if (!f)
+ return -ENOMEM;
+ *filp = f;
+
+ f = create_read_pipe(f);
+ if (!f) {
+ free_write_pipe(*filp);
+ return -ENOMEM;
+ }
+ sub_info.stdin = f;
+
+ queue_work(khelper_wq, &work);
+ wait_for_completion(&done);
+ return sub_info.retval;
+}
+EXPORT_SYMBOL(call_usermodehelper_pipe);
+