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tty: tty_buffer: use __tty_insert_flip_string_flags() in tty_insert_flip_char()

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Use __tty_insert_flip_string_flags() for the slow path of
tty_insert_flip_char(). The former is generic enough, so there is no
reason to reimplement the injection once again.

So now we have a single function stuffing into tty buffers.

Signed-off-by: "Jiri Slaby (SUSE)" <jirislaby@kernel.org>
Link: https://lore.kernel.org/r/20230816105530.3335-8-jirislaby@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jiri Slaby (SUSE) 2023-08-16 12:55:27 +02:00 committed by Greg Kroah-Hartman
parent 2ce2983c24
commit b49a0ff732
3 changed files with 11 additions and 30 deletions
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3
Documentation/driver-api/tty/tty_buffer.rst
View file

@ -15,11 +15,12 @@ Flip Buffer Management
======================
.. kernel-doc:: drivers/tty/tty_buffer.c
:identifiers: tty_prepare_flip_string __tty_insert_flip_char
:identifiers: tty_prepare_flip_string
tty_flip_buffer_push tty_ldisc_receive_buf
.. kernel-doc:: include/linux/tty_flip.h
:identifiers: tty_insert_flip_string_fixed_flag tty_insert_flip_string_flags
tty_insert_flip_char
----

26
drivers/tty/tty_buffer.c
View file

@ -343,32 +343,6 @@ size_t __tty_insert_flip_string_flags(struct tty_port *port, const u8 *chars,
}
EXPORT_SYMBOL(__tty_insert_flip_string_flags);
/**
* __tty_insert_flip_char - add one character to the tty buffer
* @port: tty port
* @ch: character
* @flag: flag byte
*
* Queue a single byte @ch to the tty buffering, with an optional flag. This is
* the slow path of tty_insert_flip_char().
*/
int __tty_insert_flip_char(struct tty_port *port, u8 ch, u8 flag)
{
struct tty_buffer *tb;
bool flags = flag != TTY_NORMAL;
if (!__tty_buffer_request_room(port, 1, flags))
return 0;
tb = port->buf.tail;
if (tb->flags)
*flag_buf_ptr(tb, tb->used) = flag;
*char_buf_ptr(tb, tb->used++) = ch;
return 1;
}
EXPORT_SYMBOL(__tty_insert_flip_char);
/**
* tty_prepare_flip_string - make room for characters
* @port: tty port

12
include/linux/tty_flip.h
View file

@ -15,7 +15,6 @@ size_t __tty_insert_flip_string_flags(struct tty_port *port, const u8 *chars,
size_t size);
size_t tty_prepare_flip_string(struct tty_port *port, u8 **chars, size_t size);
void tty_flip_buffer_push(struct tty_port *port);
int __tty_insert_flip_char(struct tty_port *port, u8 ch, u8 flag);
/**
* tty_insert_flip_string_fixed_flag - add characters to the tty buffer
@ -55,7 +54,14 @@ static inline size_t tty_insert_flip_string_flags(struct tty_port *port,
return __tty_insert_flip_string_flags(port, chars, flags, true, size);
}
/**
* tty_insert_flip_char - add one character to the tty buffer
* @port: tty port
* @ch: character
* @flag: flag byte
*
* Queue a single byte @ch to the tty buffering, with an optional flag.
*/
static inline size_t tty_insert_flip_char(struct tty_port *port, u8 ch, u8 flag)
{
struct tty_buffer *tb = port->buf.tail;
@ -68,7 +74,7 @@ static inline size_t tty_insert_flip_char(struct tty_port *port, u8 ch, u8 flag)
*char_buf_ptr(tb, tb->used++) = ch;
return 1;
}
return __tty_insert_flip_char(port, ch, flag);
return __tty_insert_flip_string_flags(port, &ch, &flag, false, 1);
}
static inline size_t tty_insert_flip_string(struct tty_port *port,