diff --git a/target/linux/generic/backport-5.15/005-add-tty-driver-missing-function.patch b/target/linux/generic/backport-5.15/005-add-tty-driver-missing-function.patch
new file mode 100644
index 000000000..7c2e439fe
--- /dev/null
+++ b/target/linux/generic/backport-5.15/005-add-tty-driver-missing-function.patch
@@ -0,0 +1,61 @@
+From 80fb91b164f3fdc7b2c54198d5fa7757b084c466 Mon Sep 17 00:00:00 2001
+From: W_Y_CPP <383152993@qq.com>
+Date: Wed, 9 Mar 2022 01:45:44 -0500
+Subject: [PATCH] add tty driver missing function
+
+---
+ drivers/tty/tty_io.c       | 13 +++++++++++++
+ include/linux/tty_driver.h | 15 +++++++++++++++
+ 2 files changed, 28 insertions(+)
+
+diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
+index 6616d4a0d..79c6cc39e 100644
+--- a/drivers/tty/tty_io.c
++++ b/drivers/tty/tty_io.c
+@@ -3438,6 +3438,12 @@ void tty_driver_kref_put(struct tty_driver *driver)
+ }
+ EXPORT_SYMBOL(tty_driver_kref_put);
+ 
++void put_tty_driver(struct tty_driver *d)
++{
++	tty_driver_kref_put(d);
++}
++EXPORT_SYMBOL(put_tty_driver);
++
+ /*
+  * Called by a tty driver to register itself.
+  */
+diff --git a/include/linux/tty_driver.h b/include/linux/tty_driver.h
+index c20431d8d..cc404cfdc 100644
+--- a/include/linux/tty_driver.h
++++ b/include/linux/tty_driver.h
+@@ -329,6 +329,7 @@ extern struct list_head tty_drivers;
+ 
+ extern struct tty_driver *__tty_alloc_driver(unsigned int lines,
+ 		struct module *owner, unsigned long flags);
++extern void put_tty_driver(struct tty_driver *driver);
+ extern struct tty_driver *tty_find_polling_driver(char *name, int *line);
+ 
+ extern void tty_driver_kref_put(struct tty_driver *driver);
+@@ -337,6 +340,18 @@ extern void tty_driver_kref_put(struct tty_driver *driver);
+ #define tty_alloc_driver(lines, flags) \
+ 		__tty_alloc_driver(lines, THIS_MODULE, flags)
+ 
++/*
++ * DEPRECATED Do not use this in new code, use tty_alloc_driver instead.
++ * (And change the return value checks.)
++ */
++static inline struct tty_driver *alloc_tty_driver(unsigned int lines)
++{
++	struct tty_driver *ret = tty_alloc_driver(lines, 0);
++	if (IS_ERR(ret))
++		return NULL;
++	return ret;
++}
++
+ static inline struct tty_driver *tty_driver_kref_get(struct tty_driver *d)
+ {
+ 	kref_get(&d->kref);
+-- 
+2.17.1
+