linux-kernel - [PATCH 3.10 085/250] USB: serial: ch341: fix open and resume after B0

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Message-Id: <1496876436-32402-86-git-send-email-w@1wt.eu>
Date:   Thu,  8 Jun 2017 00:57:51 +0200
From:   Willy Tarreau <w@....eu>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        linux@...ck-us.net
Cc:     Johan Hovold <johan@...nel.org>, Willy Tarreau <w@....eu>
Subject: [PATCH 3.10 085/250] USB: serial: ch341: fix open and resume after B0

From: Johan Hovold <johan@...nel.org>

commit a20047f36e2f6a1eea4f1fd261aaa55882369868 upstream.

The private baud_rate variable is used to configure the port at open and
reset-resume and must never be set to (and left at) zero or reset-resume
and all further open attempts will fail.

Fixes: aa91def41a7b ("USB: ch341: set tty baud speed according to tty struct")
Fixes: 664d5df92e88 ("USB: usb-serial ch341: support for DTR/RTS/CTS")
Signed-off-by: Johan Hovold <johan@...nel.org>
Signed-off-by: Willy Tarreau <w@....eu>
---
 drivers/usb/serial/ch341.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/usb/serial/ch341.c b/drivers/usb/serial/ch341.c
index db37b16..e9cfd40 100644
--- a/drivers/usb/serial/ch341.c
+++ b/drivers/usb/serial/ch341.c
@@ -368,12 +368,11 @@ static void ch341_set_termios(struct tty_struct *tty,
 
 	baud_rate = tty_get_baud_rate(tty);
 
-	priv->baud_rate = baud_rate;
-
 	if (baud_rate) {
 		spin_lock_irqsave(&priv->lock, flags);
 		priv->line_control |= (CH341_BIT_DTR | CH341_BIT_RTS);
 		spin_unlock_irqrestore(&priv->lock, flags);
+		priv->baud_rate = baud_rate;
 		ch341_set_baudrate(port->serial->dev, priv);
 	} else {
 		spin_lock_irqsave(&priv->lock, flags);
-- 
2.8.0.rc2.1.gbe9624a