From a377f9e906af4df9071ba8ddba60188cb4013d93 Mon Sep 17 00:00:00 2001 From: Konstantin Shkolnyy Date: Wed, 4 May 2016 16:56:52 -0500 Subject: [PATCH] USB: serial: cp210x: fix hardware flow-control disable A bug in the CRTSCTS handling caused RTS to alternate between CRTSCTS=0 => "RTS is transmit active signal" and CRTSCTS=1 => "RTS is used for receive flow control" instead of CRTSCTS=0 => "RTS is statically active" and CRTSCTS=1 => "RTS is used for receive flow control" This only happened after first having enabled CRTSCTS. Signed-off-by: Konstantin Shkolnyy Fixes: 39a66b8d22a3 ("[PATCH] USB: CP2101 Add support for flow control") Cc: stable [johan: reword commit message ] Signed-off-by: Johan Hovold --- drivers/usb/serial/cp210x.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/drivers/usb/serial/cp210x.c b/drivers/usb/serial/cp210x.c index dd47823bb014..fef7a512bff4 100644 --- a/drivers/usb/serial/cp210x.c +++ b/drivers/usb/serial/cp210x.c @@ -967,8 +967,7 @@ static void cp210x_set_termios(struct tty_struct *tty, } else { modem_ctl[0] &= ~0x7B; modem_ctl[0] |= 0x01; - /* FIXME - OR here instead of assignment looks wrong */ - modem_ctl[4] |= 0x40; + modem_ctl[4] = 0x40; dev_dbg(dev, "%s - flow control = NONE\n", __func__); } -- 2.39.5