diff options
| author | Jiri Slaby <jslaby@suse.cz> | 2021-05-10 08:59:22 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-05-13 18:29:11 +0200 |
| commit | 76af233d9b0c0b749e97b8f90fd0ff0e417ce3e3 (patch) | |
| tree | 93f6e3d975c3b83178ac6a4fd5c9d803cf23f573 /drivers/tty/tty_ioctl.c | |
| parent | 1bf42296634178b2435e2b313443864467bbb848 (diff) | |
tty: remove unused tty_throttle
The last user was removed in commit e91e52e42814 (n_tty: Fix stuck
throttled driver) in 2013. So remove exported tty_throttle completely.
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Link: https://lore.kernel.org/r/20210510065923.5112-1-jslaby@suse.cz
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/tty_ioctl.c')
| -rw-r--r-- | drivers/tty/tty_ioctl.c | 31 |
1 files changed, 5 insertions, 26 deletions
diff --git a/drivers/tty/tty_ioctl.c b/drivers/tty/tty_ioctl.c index aa9ecc8be990..75885d502749 100644 --- a/drivers/tty/tty_ioctl.c +++ b/drivers/tty/tty_ioctl.c @@ -97,28 +97,6 @@ void tty_driver_flush_buffer(struct tty_struct *tty) EXPORT_SYMBOL(tty_driver_flush_buffer); /** - * tty_throttle - flow control - * @tty: terminal - * - * Indicate that a tty should stop transmitting data down the stack. - * Takes the termios rwsem to protect against parallel throttle/unthrottle - * and also to ensure the driver can consistently reference its own - * termios data at this point when implementing software flow control. - */ - -void tty_throttle(struct tty_struct *tty) -{ - down_write(&tty->termios_rwsem); - /* check TTY_THROTTLED first so it indicates our state */ - if (!test_and_set_bit(TTY_THROTTLED, &tty->flags) && - tty->ops->throttle) - tty->ops->throttle(tty); - tty->flow_change = 0; - up_write(&tty->termios_rwsem); -} -EXPORT_SYMBOL(tty_throttle); - -/** * tty_unthrottle - flow control * @tty: terminal * @@ -146,10 +124,11 @@ EXPORT_SYMBOL(tty_unthrottle); * tty_throttle_safe - flow control * @tty: terminal * - * Similar to tty_throttle() but will only attempt throttle - * if tty->flow_change is TTY_THROTTLE_SAFE. Prevents an accidental - * throttle due to race conditions when throttling is conditional - * on factors evaluated prior to throttling. + * Indicate that a tty should stop transmitting data down the stack. + * tty_throttle_safe will only attempt throttle if tty->flow_change is + * TTY_THROTTLE_SAFE. Prevents an accidental throttle due to race + * conditions when throttling is conditional on factors evaluated prior to + * throttling. * * Returns 0 if tty is throttled (or was already throttled) */ |