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tty: remove unused tty_throttle

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The last user was removed in commit e91e52e428 (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>
This commit is contained in:
Jiri Slaby 2021-05-10 08:59:22 +02:00 committed by Greg Kroah-Hartman
parent 1bf4229663
commit 76af233d9b
3 changed files with 6 additions and 28 deletions
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31
drivers/tty/tty_ioctl.c
View file

@ -96,28 +96,6 @@ 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)
*/

1
include/linux/tty.h
View file

@ -461,7 +461,6 @@ extern int tty_put_char(struct tty_struct *tty, unsigned char c);
extern unsigned int tty_chars_in_buffer(struct tty_struct *tty);
extern unsigned int tty_write_room(struct tty_struct *tty);
extern void tty_driver_flush_buffer(struct tty_struct *tty);
extern void tty_throttle(struct tty_struct *tty);
extern void tty_unthrottle(struct tty_struct *tty);
extern int tty_throttle_safe(struct tty_struct *tty);
extern int tty_unthrottle_safe(struct tty_struct *tty);

2
include/linux/tty_driver.h
View file

@ -136,7 +136,7 @@
* the line discipline are close to full, and it should somehow
* signal that no more characters should be sent to the tty.
*
* Optional: Always invoke via tty_throttle(), called under the
* Optional: Always invoke via tty_throttle_safe(), called under the
* termios lock.
*
* void (*unthrottle)(struct tty_struct * tty);