umh: Rename the user mode driver helpers for clarity

Now that the functionality of umh_setup_pipe and
umh_clean_and_save_pid has changed their names are too specific and
don't make much sense.  Instead name them  umd_setup and umd_cleanup
for the functional role in setting up user mode drivers.

v1: https://lkml.kernel.org/r/875zbegf82.fsf_-_@x220.int.ebiederm.org
v2: https://lkml.kernel.org/r/87tuyt63x3.fsf_-_@x220.int.ebiederm.org
Link: https://lkml.kernel.org/r/20200702164140.4468-3-ebiederm@xmission.comReviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Tested-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>

kernel/umh.c

@@ -429,7 +429,7 @@ struct subprocess_info *call_usermodehelper_setup_file(struct file *file,
 	return sub_info;
 }
 
-static int umh_pipe_setup(struct subprocess_info *info, struct cred *new)
+static int umd_setup(struct subprocess_info *info, struct cred *new)
 {
 	struct umh_info *umh_info = info->data;
 	struct file *from_umh[2];
@@ -470,11 +470,11 @@ static int umh_pipe_setup(struct subprocess_info *info, struct cred *new)
 	return 0;
 }
 
-static void umh_clean_and_save_pid(struct subprocess_info *info)
+static void umd_cleanup(struct subprocess_info *info)
 {
 	struct umh_info *umh_info = info->data;
 
-	/* cleanup if umh_pipe_setup() was successful but exec failed */
+	/* cleanup if umh_setup() was successful but exec failed */
 	if (info->retval) {
 		fput(umh_info->pipe_to_umh);
 		fput(umh_info->pipe_from_umh);
@@ -520,8 +520,8 @@ int fork_usermode_blob(void *data, size_t len, struct umh_info *info)
 	}
 
 	err = -ENOMEM;
-	sub_info = call_usermodehelper_setup_file(file, umh_pipe_setup,
-						  umh_clean_and_save_pid, info);
+	sub_info = call_usermodehelper_setup_file(file, umd_setup, umd_cleanup,
+						  info);
 	if (!sub_info)
 		goto out;