[PATCH 19/24] USB: serial: fix return value for unsupported ioctls

Johan Hovold
2021-04-07T10:41:28Z

Drivers should return -ENOTTY ("Inappropriate I/O control operation")
when an ioctl isn't supported, while -EINVAL is used for invalid
arguments.

Fix up the TIOCMGET, TIOCMSET and TIOCGICOUNT helpers which returned
-EINVAL when a USB serial driver did not implement the corresponding
methods.

Note that the TIOCMGET and TIOCMSET helpers predate git and do not get a
corresponding Fixes tag below.

Fixes: d281da7ff6f7 ("tty: Make tiocgicount a handler")
Signed-off-by: Johan Hovold <johan@kernel.org>
---
drivers/usb/serial/usb-serial.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c
index 27e3bb58c872..c311cc4fabee 100644
--- a/drivers/usb/serial/usb-serial.c
+++ b/drivers/usb/serial/usb-serial.c
@@ -502,7 +502,7 @@ static int serial_tiocmget(struct tty_struct *tty)

if (port->serial->type->tiocmget)
return port->serial->type->tiocmget(tty);
- return -EINVAL;
+ return -ENOTTY;
}

static int serial_tiocmset(struct tty_struct *tty,
@@ -514,7 +514,7 @@ static int serial_tiocmset(struct tty_struct *tty,

if (port->serial->type->tiocmset)
return port->serial->type->tiocmset(tty, set, clear);
- return -EINVAL;
+ return -ENOTTY;
}

static int serial_get_icount(struct tty_struct *tty,
@@ -526,7 +526,7 @@ static int serial_get_icount(struct tty_struct *tty,

if (port->serial->type->get_icount)
return port->serial->type->get_icount(tty, icount);
- return -EINVAL;
+ return -ENOTTY;
}

/*
--
2.26.3