On Wed, 17 Jan 2018 18:54:19 +0530 Gaurav Kohli <[email protected]> wrote:
> There can be a race, if receive_buf call comes before > tty initialization completes in n_tty_open and tty->disc_data > may be NULL. > > CPU0 CPU1 > ---- ---- > 000|n_tty_receive_buf_common() n_tty_open() > -001|n_tty_receive_buf2() tty_ldisc_open.isra.3() > -002|tty_ldisc_receive_buf(inline) tty_ldisc_setup() > > Using ldisc semaphore lock in tty_init_dev till disc_data > initializes completely. > > Signed-off-by: Gaurav Kohli <[email protected]> Reviewed-by: Alan Cox <[email protected]> Alan
