serial: core: mark port as initialized in autoconfig

BugLink: http://bugs.launchpad.net/bugs/1756978
commit 714569064adee3c114a2a6490735b94abe269068 upstream.

This is a followup on 44117a1d1732 ("serial: core: mark port as
initialized after successful IRQ change").
Nikola has been using autoconfig via setserial and reported a crash
similar to what I fixed in the earlier mentioned commit. Here I do the
same fixup for the autoconfig. I wasn't sure that this is the right
approach. Nikola confirmed that it fixes his crash.

Fixes: b3b576461864 ("tty: serial_core: convert uart_open to use tty_port_open")
Link: http://lkml.kernel.org/r/20180131072000.GD1853@localhost.localdomain
Reported-by: Nikola Ciprich <nikola.ciprich@linuxbox.cz>
Tested-by: Nikola Ciprich <nikola.ciprich@linuxbox.cz>
Cc: <stable@vger.kernel.org>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Tested-by: Nikola Ciprich <nikola.ciprich@linuxbox.cz>
Acked-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>

diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index 21ef82c3af1d6a30934629ef5cdcca0c79dbb6d4..c8e17c74e2e7eb880c5e34046f56f2b4dd378bc5 100644 (file)
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -1150,6 +1150,8 @@ static int uart_do_autoconfig(struct tty_struct *tty,struct uart_state *state)
                uport->ops->config_port(uport, flags);
 
                ret = uart_startup(tty, state, 1);
+               if (ret == 0)
+                       tty_port_set_initialized(port, true);
                if (ret > 0)
                        ret = 0;
        }