This is a note to let you know that I've just added the patch titled USB: serial: ftdi_sio: fix 300 bps rate for SIO to the 4.14-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: usb-serial-ftdi_sio-fix-300-bps-rate-for-sio.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@xxxxxxxxxxxxxxx> know about it. >From 7bd7ad3c310cd6766f170927381eea0aa6f46c69 Mon Sep 17 00:00:00 2001 From: Johan Hovold <johan@xxxxxxxxxx> Date: Tue, 13 Sep 2022 16:53:12 +0200 Subject: USB: serial: ftdi_sio: fix 300 bps rate for SIO From: Johan Hovold <johan@xxxxxxxxxx> commit 7bd7ad3c310cd6766f170927381eea0aa6f46c69 upstream. The 300 bps rate of SIO devices has been mapped to 9600 bps since 2003... Let's fix the regression. Cc: stable@xxxxxxxxxxxxxxx Signed-off-by: Johan Hovold <johan@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/usb/serial/ftdi_sio.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) --- a/drivers/usb/serial/ftdi_sio.c +++ b/drivers/usb/serial/ftdi_sio.c @@ -1309,8 +1309,7 @@ static __u32 get_ftdi_divisor(struct tty case 38400: div_value = ftdi_sio_b38400; break; case 57600: div_value = ftdi_sio_b57600; break; case 115200: div_value = ftdi_sio_b115200; break; - } /* baud */ - if (div_value == 0) { + default: dev_dbg(dev, "%s - Baudrate (%d) requested is not supported\n", __func__, baud); div_value = ftdi_sio_b9600; Patches currently in stable-queue which might be from johan@xxxxxxxxxx are queue-4.14/usb-serial-ftdi_sio-fix-300-bps-rate-for-sio.patch