Commit 74266952 authored Feb 15, 2023 by Johan Hovold Committed by Jialin Zhang Feb 17, 2023

USB: serial: ftdi_sio: fix 300 bps rate for SIO

stable inclusion
from stable-v5.10.148
commit 3451df3a514cb97c6295f6c788511a6a62140709
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I6D0WL

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=3451df3a514cb97c6295f6c788511a6a62140709



--------------------------------

commit 7bd7ad3c upstream.

The 300 bps rate of SIO devices has been mapped to 9600 bps since
2003... Let's fix the regression.

Cc: stable@vger.kernel.org
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Jialin Zhang <zhangjialin11@huawei.com>
Reviewed-by: Zheng Zengkai <zhengzengkai@huawei.com>

parent 57bbc75a

drivers/usb/serial/ftdi_sio.c

+1 −2

Original line number	Original line	Diff line number	Diff line
	@@ -1320,8 +1320,7 @@ static u32 get_ftdi_divisor(struct tty_struct *tty,
	case 38400: div_value = ftdi_sio_b38400; break;		case 38400: div_value = ftdi_sio_b38400; break;
	case 57600: div_value = ftdi_sio_b57600; break;		case 57600: div_value = ftdi_sio_b57600; break;
	case 115200: div_value = ftdi_sio_b115200; break;		case 115200: div_value = ftdi_sio_b115200; break;
	} /* baud */		default:
	if (div_value == 0) {
	dev_dbg(dev, "%s - Baudrate (%d) requested is not supported\n",		dev_dbg(dev, "%s - Baudrate (%d) requested is not supported\n",
	__func__, baud);		__func__, baud);
	div_value = ftdi_sio_b9600;		div_value = ftdi_sio_b9600;