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tty: switch tty_{,un}throttle_safe() to return a bool

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They return 0 or 1 -- a boolean value, so make it clear than noone
should expect negative or other values.

Signed-off-by: "Jiri Slaby (SUSE)" <jirislaby@kernel.org>
Link: https://lore.kernel.org/r/20230919085156.1578-7-jirislaby@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jiri Slaby (SUSE) 2023-09-19 10:51:47 +02:00 committed by Greg Kroah-Hartman
parent 043c8a7c01
commit c2a36609da
2 changed files with 10 additions and 12 deletions
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18
drivers/tty/tty_ioctl.c
View File

@ -124,17 +124,16 @@ EXPORT_SYMBOL(tty_unthrottle);
* conditions when throttling is conditional on factors evaluated prior to
* throttling.
*
* Returns 0 if tty is throttled (or was already throttled)
* Returns false if tty is throttled (or was already throttled)
*/
int tty_throttle_safe(struct tty_struct *tty)
bool tty_throttle_safe(struct tty_struct *tty)
{
int ret = 0;
bool ret = false;
mutex_lock(&tty->throttle_mutex);
if (!tty_throttled(tty)) {
if (tty->flow_change != TTY_THROTTLE_SAFE)
ret = 1;
ret = true;
else {
set_bit(TTY_THROTTLED, &tty->flags);
if (tty->ops->throttle)
@ -155,17 +154,16 @@ int tty_throttle_safe(struct tty_struct *tty)
* unthrottle due to race conditions when unthrottling is conditional
* on factors evaluated prior to unthrottling.
*
* Returns 0 if tty is unthrottled (or was already unthrottled)
* Returns false if tty is unthrottled (or was already unthrottled)
*/
int tty_unthrottle_safe(struct tty_struct *tty)
bool tty_unthrottle_safe(struct tty_struct *tty)
{
int ret = 0;
bool ret = false;
mutex_lock(&tty->throttle_mutex);
if (tty_throttled(tty)) {
if (tty->flow_change != TTY_UNTHROTTLE_SAFE)
ret = 1;
ret = true;
else {
clear_bit(TTY_THROTTLED, &tty->flags);
if (tty->ops->unthrottle)

4
include/linux/tty.h
View File

@ -416,8 +416,8 @@ unsigned int tty_chars_in_buffer(struct tty_struct *tty);
unsigned int tty_write_room(struct tty_struct *tty);
void tty_driver_flush_buffer(struct tty_struct *tty);
void tty_unthrottle(struct tty_struct *tty);
int tty_throttle_safe(struct tty_struct *tty);
int tty_unthrottle_safe(struct tty_struct *tty);
bool tty_throttle_safe(struct tty_struct *tty);
bool tty_unthrottle_safe(struct tty_struct *tty);
int tty_do_resize(struct tty_struct *tty, struct winsize *ws);
int tty_get_icount(struct tty_struct *tty,
struct serial_icounter_struct *icount);