diff options
author | Johan Hovold <johan@kernel.org> | 2021-04-07 12:52:02 +0300 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-04-10 11:36:34 +0300 |
commit | 1b8b20868a6d64cfe8174a21b25b74367bdf0560 (patch) | |
tree | ff3f74fd6a145199eebc043d4827d7ba39b8dfc8 | |
parent | d09845e98a05850a8094ea8fd6dd09a8e6824fff (diff) | |
download | linux-1b8b20868a6d64cfe8174a21b25b74367bdf0560.tar.xz |
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>
-rw-r--r-- | drivers/tty/tty_io.c | 10 | ||||
-rw-r--r-- | include/linux/tty_driver.h | 2 |
2 files changed, 6 insertions, 6 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); diff --git a/include/linux/tty_driver.h b/include/linux/tty_driver.h index 61c3372d3f32..2f719b471d52 100644 --- a/include/linux/tty_driver.h +++ b/include/linux/tty_driver.h @@ -228,7 +228,7 @@ * * Called when the device receives a TIOCGICOUNT ioctl. Passed a kernel * structure to complete. This method is optional and will only be called - * if provided (otherwise EINVAL will be returned). + * if provided (otherwise ENOTTY will be returned). */ #include <linux/export.h> |