linux-kernel - [PATCH v2 3/3] USB: serial: report unsupported break signalling

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Date:   Sun,  4 Jun 2023 14:35:05 +0200
From:   Johan Hovold <johan@...nel.org>
To:     Johan Hovold <johan@...nel.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Corey Minyard <minyard@....org>
Subject: [PATCH v2 3/3] USB: serial: report unsupported break signalling

Instead of returning success when a driver does not support break
signalling, return an error to let user space know and to avoid waiting
when break is not supported.

Signed-off-by: Johan Hovold <johan@...nel.org>
---
 drivers/usb/serial/usb-serial.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c
index 470634444af7..7b4805c1004d 100644
--- a/drivers/usb/serial/usb-serial.c
+++ b/drivers/usb/serial/usb-serial.c
@@ -541,7 +541,7 @@ static int serial_break(struct tty_struct *tty, int break_state)
 	if (port->serial->type->break_ctl)
 		return port->serial->type->break_ctl(tty, break_state);
 
-	return 0;
+	return -ENOTTY;
 }
 
 static int serial_proc_show(struct seq_file *m, void *v)
-- 
2.39.3