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tty: make tty_buffer_space_avail return uint

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tty_buffer_space_avail returns values >= 0, so make it clear by the
return type.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: Joel Stanley <joel@jms.id.au>
Link: https://lore.kernel.org/r/20210505091928.22010-25-jslaby@suse.cz
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jiri Slaby 2021-05-05 11:19:17 +02:00 committed by Greg Kroah-Hartman
parent 03b3b1a240
commit 9a33fbf9d2
3 changed files with 4 additions and 4 deletions
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4
drivers/tty/serial/8250/8250_aspeed_vuart.c
View File

@ -329,7 +329,7 @@ static int aspeed_vuart_handle_irq(struct uart_port *port)
{ {
struct uart_8250_port *up = up_to_u8250p(port); struct uart_8250_port *up = up_to_u8250p(port);
unsigned int iir, lsr; unsigned int iir, lsr;
int space, count; unsigned int space, count;
iir = serial_port_in(port, UART_IIR); iir = serial_port_in(port, UART_IIR);
@ -353,7 +353,7 @@ static int aspeed_vuart_handle_irq(struct uart_port *port)
jiffies + unthrottle_timeout); jiffies + unthrottle_timeout);
} else { } else {
count = min(space, 256); count = min(space, 256U);
do { do {
serial8250_read_char(up, lsr); serial8250_read_char(up, lsr);

2
drivers/tty/tty_buffer.c
View File

@ -88,7 +88,7 @@ EXPORT_SYMBOL_GPL(tty_buffer_unlock_exclusive);
* pre-allocate if memory guarantee is required). * pre-allocate if memory guarantee is required).
*/ */
int tty_buffer_space_avail(struct tty_port *port) unsigned int tty_buffer_space_avail(struct tty_port *port)
{ {
int space = port->buf.mem_limit - atomic_read(&port->buf.mem_used); int space = port->buf.mem_limit - atomic_read(&port->buf.mem_used);
return max(space, 0); return max(space, 0);

2
include/linux/tty_flip.h
View File

@ -3,7 +3,7 @@
#define _LINUX_TTY_FLIP_H #define _LINUX_TTY_FLIP_H
extern int tty_buffer_set_limit(struct tty_port *port, int limit); extern int tty_buffer_set_limit(struct tty_port *port, int limit);
extern int tty_buffer_space_avail(struct tty_port *port); extern unsigned int tty_buffer_space_avail(struct tty_port *port);
extern int tty_buffer_request_room(struct tty_port *port, size_t size); extern int tty_buffer_request_room(struct tty_port *port, size_t size);
extern int tty_insert_flip_string_flags(struct tty_port *port, extern int tty_insert_flip_string_flags(struct tty_port *port,
const unsigned char *chars, const char *flags, size_t size); const unsigned char *chars, const char *flags, size_t size);