diff options
| author | Johan Hovold <johan@kernel.org> | 2021-04-07 11:52:02 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-04-10 10:36:34 +0200 |
| commit | 1b8b20868a6d64cfe8174a21b25b74367bdf0560 (patch) | |
| tree | ff3f74fd6a145199eebc043d4827d7ba39b8dfc8 /drivers/tty | |
| parent | d09845e98a05850a8094ea8fd6dd09a8e6824fff (diff) | |
tty: fix return value for unsupported ioctls
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 tty driver did not implement the corresponding
operations.
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>
Link: https://lore.kernel.org/r/20210407095208.31838-3-johan@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/tty_io.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c index ebcde1f96adb..7738514a15fe 100644 --- a/drivers/tty/tty_io.c +++ b/drivers/tty/tty_io.c @@ -2529,14 +2529,14 @@ out: * @p: pointer to result * * Obtain the modem status bits from the tty driver if the feature - * is supported. Return -EINVAL if it is not available. + * is supported. Return -ENOTTY if it is not available. * * Locking: none (up to the driver) */ static int tty_tiocmget(struct tty_struct *tty, int __user *p) { - int retval = -EINVAL; + int retval = -ENOTTY; if (tty->ops->tiocmget) { retval = tty->ops->tiocmget(tty); @@ -2554,7 +2554,7 @@ static int tty_tiocmget(struct tty_struct *tty, int __user *p) * @p: pointer to desired bits * * Set the modem status bits from the tty driver if the feature - * is supported. Return -EINVAL if it is not available. + * is supported. Return -ENOTTY if it is not available. * * Locking: none (up to the driver) */ @@ -2566,7 +2566,7 @@ static int tty_tiocmset(struct tty_struct *tty, unsigned int cmd, unsigned int set, clear, val; if (tty->ops->tiocmset == NULL) - return -EINVAL; + return -ENOTTY; retval = get_user(val, p); if (retval) @@ -2606,7 +2606,7 @@ int tty_get_icount(struct tty_struct *tty, if (tty->ops->get_icount) return tty->ops->get_icount(tty, icount); else - return -EINVAL; + return -ENOTTY; } EXPORT_SYMBOL_GPL(tty_get_icount); |