linux-kernel - [PATCH 3/8] USB: serial: belkin

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Message-ID: <20251022152640.24212-4-johan@kernel.org>
Date: Wed, 22 Oct 2025 17:26:35 +0200
From: Johan Hovold <johan@...nel.org>
To: Johan Hovold <johan@...nel.org>
Cc: linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 3/8] USB: serial: belkin_sa: clean up tiocmset()

Clean up the tiocmset() implementation by dropping the dtr and rts flags
to make the logic a little easier to follow.

Signed-off-by: Johan Hovold <johan@...nel.org>
---
 drivers/usb/serial/belkin_sa.c | 22 ++++++----------------
 1 file changed, 6 insertions(+), 16 deletions(-)

diff --git a/drivers/usb/serial/belkin_sa.c b/drivers/usb/serial/belkin_sa.c
index aa6b4c4ad5ec..5c41c1c82c3f 100644
--- a/drivers/usb/serial/belkin_sa.c
+++ b/drivers/usb/serial/belkin_sa.c
@@ -436,33 +436,23 @@ static int belkin_sa_tiocmset(struct tty_struct *tty,
 	unsigned long control_state;
 	unsigned long flags;
 	int retval = 0;
-	int rts = 0;
-	int dtr = 0;
 
 	spin_lock_irqsave(&priv->lock, flags);
 	control_state = priv->control_state;
 
-	if (set & TIOCM_RTS) {
+	if (set & TIOCM_RTS)
 		control_state |= TIOCM_RTS;
-		rts = 1;
-	}
-	if (set & TIOCM_DTR) {
+	if (set & TIOCM_DTR)
 		control_state |= TIOCM_DTR;
-		dtr = 1;
-	}
-	if (clear & TIOCM_RTS) {
+	if (clear & TIOCM_RTS)
 		control_state &= ~TIOCM_RTS;
-		rts = 1;
-	}
-	if (clear & TIOCM_DTR) {
+	if (clear & TIOCM_DTR)
 		control_state &= ~TIOCM_DTR;
-		dtr = 1;
-	}
 
 	priv->control_state = control_state;
 	spin_unlock_irqrestore(&priv->lock, flags);
 
-	if (rts) {
+	if ((set | clear) & TIOCM_RTS) {
 		retval = BSA_USB_CMD(BELKIN_SA_SET_RTS_REQUEST,
 					!!(control_state & TIOCM_RTS));
 		if (retval < 0) {
@@ -471,7 +461,7 @@ static int belkin_sa_tiocmset(struct tty_struct *tty,
 		}
 	}
 
-	if (dtr) {
+	if ((set | clear) & TIOCM_DTR) {
 		retval = BSA_USB_CMD(BELKIN_SA_SET_DTR_REQUEST,
 					!!(control_state & TIOCM_DTR));
 		if (retval < 0) {
-- 
2.49.1