linux-kernel - [PATCH] USB: serial: xr: fix CSIZE handling

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Message-Id: <20210330143716.9042-1-johan@kernel.org>
Date:   Tue, 30 Mar 2021 16:37:16 +0200
From:   Johan Hovold <johan@...nel.org>
To:     Johan Hovold <johan@...nel.org>
Cc:     Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        Manivannan Sadhasivam <mani@...nel.org>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] USB: serial: xr: fix CSIZE handling

The XR21V141X does not have a 5- or 6-bit mode, but the current
implementation failed to properly restore the old setting when CS5 or
CS6 was requested. Instead an invalid request would be sent to the
device.

Fixes: c2d405aa86b4 ("USB: serial: add MaxLinear/Exar USB to Serial driver")
Signed-off-by: Johan Hovold <johan@...nel.org>
---
 drivers/usb/serial/xr_serial.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/usb/serial/xr_serial.c b/drivers/usb/serial/xr_serial.c
index 0ca04906da4b..c59c8b47a120 100644
--- a/drivers/usb/serial/xr_serial.c
+++ b/drivers/usb/serial/xr_serial.c
@@ -467,6 +467,11 @@ static void xr_set_termios(struct tty_struct *tty,
 		termios->c_cflag &= ~CSIZE;
 		if (old_termios)
 			termios->c_cflag |= old_termios->c_cflag & CSIZE;
+		else
+			termios->c_cflag |= CS8;
+
+		if (C_CSIZE(tty) == CS7)
+			bits |= XR21V141X_UART_DATA_7;
 		else
 			bits |= XR21V141X_UART_DATA_8;
 		break;
-- 
2.26.3