linux-kernel - [PATCH 3.16 052/212] USB: serial: opticon: fix CTS retrieval at open

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Message-ID: <lsq.1496331795.106732655@decadent.org.uk>
Date:   Thu, 01 Jun 2017 16:43:15 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Johan Hovold" <johan@...nel.org>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
        "Dan Carpenter" <dan.carpenter@...cle.com>
Subject: [PATCH 3.16 052/212] USB: serial: opticon: fix CTS retrieval at open

3.16.44-rc1 review patch.  If anyone has any objections, please let me know.

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

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

commit 2eee05020a0e7ee7c04422cbacdb07859e45dce6 upstream.

The opticon driver used a control request at open to trigger a CTS
status notification to be sent over the bulk-in pipe. When the driver
was converted to using the generic read implementation, an inverted test
prevented this request from being sent, something which could lead to
TIOCMGET reporting an incorrect CTS state.

Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Fixes: 7a6ee2b02751 ("USB: opticon: switch to generic read
implementation")
Reviewed-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Johan Hovold <johan@...nel.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/usb/serial/opticon.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/usb/serial/opticon.c
+++ b/drivers/usb/serial/opticon.c
@@ -142,7 +142,7 @@ static int opticon_open(struct tty_struc
 	usb_clear_halt(port->serial->dev, port->read_urb->pipe);
 
 	res = usb_serial_generic_open(tty, port);
-	if (!res)
+	if (res)
 		return res;
 
 	/* Request CTS line state, sometimes during opening the current