[PATCH 4.15 30/55] tty: fix data race between tty_init_dev and flush of buf

4.15-stable review patch. If anyone has any objections, please let me know. -- From: Gaurav Kohli commit b027e2298bd588d6fa36ed2eda97447fb3eac078 upstream. There can be a race, if receive_buf call comes before tty initialization completes in n_tty_open

[PATCH 4.15 30/55] tty: fix data race between tty_init_dev and flush of buf

4.15-stable review patch. If anyone has any objections, please let me know. -- From: Gaurav Kohli commit b027e2298bd588d6fa36ed2eda97447fb3eac078 upstream. There can be a race, if receive_buf call comes before tty initialization completes in n_tty_open and tty->disc_data may