[PATCH 4.4 80/86] serial: txx9: add missing platform_driver_unregister() on error in serial_txx9_init

[Greg Kroah-Hartman]

From: Qinglang Miao <miaoqingl...@huawei.com>

commit 0c5fc92622ed5531ff324b20f014e9e3092f0187 upstream.

Add the missing platform_driver_unregister() before return
from serial_txx9_init in the error handling case when failed
to register serial_txx9_pci_driver with macro ENABLE_SERIAL_TXX9_PCI
defined.

Fixes: ab4382d27412 ("tty: move drivers/serial/ to drivers/tty/serial/")
Signed-off-by: Qinglang Miao <miaoqingl...@huawei.com>
Link: https://lore.kernel.org/r/20201103084942.109076-1-miaoqingl...@huawei.com
Cc: stable <sta...@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 drivers/tty/serial/serial_txx9.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/tty/serial/serial_txx9.c
+++ b/drivers/tty/serial/serial_txx9.c
@@ -1287,6 +1287,9 @@ static int __init serial_txx9_init(void)
 
 #ifdef ENABLE_SERIAL_TXX9_PCI
        ret = pci_register_driver(&serial_txx9_pci_driver);
+       if (ret) {
+               platform_driver_unregister(&serial_txx9_plat_driver);
+       }
 #endif
        if (ret == 0)
                goto out;