linux-kernel - [PATCH] greybus: uart: fix uninitialized flow control variable

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Date:   Wed, 29 Apr 2020 21:00:09 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     David Lin <dtwlin@...il.com>, Johan Hovold <johan@...nel.org>,
        Alex Elder <elder@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Axel Haslam <ahaslam@...libre.com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Johan Hovold <johan@...oldconsulting.com>,
        Greg Kroah-Hartman <gregkh@...gle.com>,
        Mark Greer <mgreer@...malcreek.com>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        greybus-dev@...ts.linaro.org, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] greybus: uart: fix uninitialized flow control variable

gcc-10 points out an uninitialized variable use:

drivers/staging/greybus/uart.c: In function 'gb_tty_set_termios':
drivers/staging/greybus/uart.c:540:24: error: 'newline.flow_control' is used uninitialized in this function [-Werror=uninitialized]
  540 |   newline.flow_control |= GB_SERIAL_AUTO_RTSCTS_EN;

Instead of using |= and &= on the uninitialized variable, use a
direct assignment.

Fixes: e55c25206d5c ("greybus: uart: Handle CRTSCTS flag in termios")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/staging/greybus/uart.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/greybus/uart.c b/drivers/staging/greybus/uart.c
index 55c51143bb09..4ffb334cd5cd 100644
--- a/drivers/staging/greybus/uart.c
+++ b/drivers/staging/greybus/uart.c
@@ -537,9 +537,9 @@ static void gb_tty_set_termios(struct tty_struct *tty,
 	}
 
 	if (C_CRTSCTS(tty) && C_BAUD(tty) != B0)
-		newline.flow_control |= GB_SERIAL_AUTO_RTSCTS_EN;
+		newline.flow_control = GB_SERIAL_AUTO_RTSCTS_EN;
 	else
-		newline.flow_control &= ~GB_SERIAL_AUTO_RTSCTS_EN;
+		newline.flow_control = 0;
 
 	if (memcmp(&gb_tty->line_coding, &newline, sizeof(newline))) {
 		memcpy(&gb_tty->line_coding, &newline, sizeof(newline));
-- 
2.26.0