linux-kernel - [PATCH 5.13 18/24] USB: serial: cp210x: fix control-characters error handling

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Message-Id: <20210906125449.717812358@linuxfoundation.org>
Date:   Mon,  6 Sep 2021 14:55:47 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Johan Hovold <johan@...nel.org>
Subject: [PATCH 5.13 18/24] USB: serial: cp210x: fix control-characters error handling

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

commit 2d9a00705910ccea2dc5d9cba5469ff2de72fc87 upstream.

In the unlikely event that setting the software flow-control characters
fails the other flow-control settings should still be updated (just like
all other terminal settings).

Move out the error message printed by the set_chars() helper to make it
more obvious that this is intentional.

Fixes: 7748feffcd80 ("USB: serial: cp210x: add support for software flow control")
Cc: stable@...r.kernel.org	# 5.11
Reviewed-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Johan Hovold <johan@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/usb/serial/cp210x.c |   10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

--- a/drivers/usb/serial/cp210x.c
+++ b/drivers/usb/serial/cp210x.c
@@ -1110,10 +1110,8 @@ static int cp210x_set_chars(struct usb_s
 
 	kfree(dmabuf);
 
-	if (result < 0) {
-		dev_err(&port->dev, "failed to set special chars: %d\n", result);
+	if (result < 0)
 		return result;
-	}
 
 	return 0;
 }
@@ -1165,8 +1163,10 @@ static void cp210x_set_flow_control(stru
 		chars.bXoffChar = STOP_CHAR(tty);
 
 		ret = cp210x_set_chars(port, &chars);
-		if (ret)
-			return;
+		if (ret) {
+			dev_err(&port->dev, "failed to set special chars: %d\n",
+					ret);
+		}
 	}
 
 	mutex_lock(&port_priv->mutex);