This is a note to let you know that I've just added the patch titled

serdev: ttyport: enforce tty-driver open() requirement

to the 4.14-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: serdev-ttyport-enforce-tty-driver-open-requirement.patch and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From foo@baz Mon Dec 18 13:28:59 CET 2017

From: Johan Hovold johan@kernel.org Date: Mon, 16 Oct 2017 15:06:19 +0200 Subject: serdev: ttyport: enforce tty-driver open() requirement

From: Johan Hovold johan@kernel.org

[ Upstream commit dee7d0f3b200c67c6ee96bd37c6e8fa52690ab56 ]

The tty-driver open routine is mandatory, but the serdev tty-port-controller implementation did not treat it as such and would instead fall back to calling tty_port_open() directly.

Signed-off-by: Johan Hovold johan@kernel.org Acked-by: Rob Herring robh@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Sasha Levin alexander.levin@verizon.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/tty/serdev/serdev-ttyport.c | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-)

--- a/drivers/tty/serdev/serdev-ttyport.c +++ b/drivers/tty/serdev/serdev-ttyport.c @@ -120,10 +120,10 @@ static int ttyport_open(struct serdev_co return PTR_ERR(tty); serport->tty = tty;

- if (tty->ops->open) - tty->ops->open(serport->tty, NULL); - else - tty_port_open(serport->port, tty, NULL); + if (!tty->ops->open) + goto err_unlock; + + tty->ops->open(serport->tty, NULL);

/* Bring the UART into a known 8 bits no parity hw fc state */ ktermios = tty->termios; @@ -140,6 +140,12 @@ static int ttyport_open(struct serdev_co

tty_unlock(serport->tty); return 0; + +err_unlock: + tty_unlock(tty); + tty_release_struct(tty, serport->tty_idx); + + return -ENODEV; }

static void ttyport_close(struct serdev_controller *ctrl)

Patches currently in stable-queue which might be from johan@kernel.org are

queue-4.14/serdev-ttyport-enforce-tty-driver-open-requirement.patch