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

tty/serial: atmel: manage shutdown in case of RS485 or ISO7816 mode

to my tty git tree which can be found at git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty.git in the tty-linus branch.

The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)

The patch will hopefully also be merged in Linus's tree for the next -rc kernel release.

If you have any questions about this process, please let me know.

From 04b5bfe3dc94e64d0590c54045815cb5183fb095 Mon Sep 17 00:00:00 2001

From: Nicolas Ferre nicolas.ferre@microchip.com Date: Mon, 10 Feb 2020 16:20:53 +0100 Subject: tty/serial: atmel: manage shutdown in case of RS485 or ISO7816 mode

In atmel_shutdown() we call atmel_stop_rx() and atmel_stop_tx() functions. Prevent the rx restart that is implemented in RS485 or ISO7816 modes when calling atmel_stop_tx() by using the atomic information tasklet_shutdown that is already in place for this purpose.

Fixes: 98f2082c3ac4 ("tty/serial: atmel: enforce tasklet init and termination sequences") Signed-off-by: Nicolas Ferre nicolas.ferre@microchip.com Cc: stable stable@vger.kernel.org Link: https://lore.kernel.org/r/20200210152053.8289-1-nicolas.ferre@microchip.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/tty/serial/atmel_serial.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c index c15c398c88a9..a39c87a7c2e1 100644 --- a/drivers/tty/serial/atmel_serial.c +++ b/drivers/tty/serial/atmel_serial.c @@ -570,7 +570,8 @@ static void atmel_stop_tx(struct uart_port *port) atmel_uart_writel(port, ATMEL_US_IDR, atmel_port->tx_done_mask);

if (atmel_uart_is_half_duplex(port)) - atmel_start_rx(port); + if (!atomic_read(&atmel_port->tasklet_shutdown)) + atmel_start_rx(port);

}