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tty: make counts in tty_port_client_operations hooks size_t

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The counts in tty_port_client_operations hooks' are currently
represented by all 'int', 'unsigned int', and 'size_t'. Unify them all
to unsigned 'size_t' for clarity. Note that size_t is used already in
tty_buffer.c. So, eventually, it is spread for counts everywhere and
this is the beginning.

So the two changes namely:
* ::receive_buf() is called from tty_ldisc_receive_buf(). And that
  expects values ">= 0" from ::receive_buf(), so switch its rettype to
  size_t is fine. tty_ldisc_receive_buf() types will be changed
  separately.
* ::lookahead_buf()'s count comes from lookahead_bufs() and is already
  'unsigned int'.

Signed-off-by: "Jiri Slaby (SUSE)" <jirislaby@kernel.org>
Cc: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230810091510.13006-11-jirislaby@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jiri Slaby (SUSE) 2023-08-10 11:14:44 +02:00 committed by Greg Kroah-Hartman
parent 0b7a2b2829
commit 0468a8071d
3 changed files with 10 additions and 11 deletions
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4
drivers/tty/serdev/serdev-ttyport.c
View File

@ -22,8 +22,8 @@ struct serport {
* Callback functions from the tty port.
*/
static int ttyport_receive_buf(struct tty_port *port, const u8 *cp,
const u8 *fp, size_t count)
static size_t ttyport_receive_buf(struct tty_port *port, const u8 *cp,
const u8 *fp, size_t count)
{
struct serdev_controller *ctrl = port->client_data;
struct serport *serport = serdev_controller_get_drvdata(ctrl);

11
drivers/tty/tty_port.c
View File

@ -20,10 +20,9 @@
#include <linux/serdev.h>
#include "tty.h"
static int tty_port_default_receive_buf(struct tty_port *port, const u8 *p,
const u8 *f, size_t count)
static size_t tty_port_default_receive_buf(struct tty_port *port, const u8 *p,
const u8 *f, size_t count)
{
int ret;
struct tty_struct *tty;
struct tty_ldisc *ld;
@ -35,15 +34,15 @@ static int tty_port_default_receive_buf(struct tty_port *port, const u8 *p,
if (!ld)
return 0;
ret = tty_ldisc_receive_buf(ld, p, (char *)f, count);
count = tty_ldisc_receive_buf(ld, p, (char *)f, count);
tty_ldisc_deref(ld);
return ret;
return count;
}
static void tty_port_default_lookahead_buf(struct tty_port *port, const u8 *p,
const u8 *f, unsigned int count)
const u8 *f, size_t count)
{
struct tty_struct *tty;
struct tty_ldisc *ld;

6
include/linux/tty_port.h
View File

@ -39,10 +39,10 @@ struct tty_port_operations {
};
struct tty_port_client_operations {
int (*receive_buf)(struct tty_port *port, const u8 *cp, const u8 *fp,
size_t count);
size_t (*receive_buf)(struct tty_port *port, const u8 *cp, const u8 *fp,
size_t count);
void (*lookahead_buf)(struct tty_port *port, const u8 *cp,
const u8 *fp, unsigned int count);
const u8 *fp, size_t count);
void (*write_wakeup)(struct tty_port *port);
};