[PATCH 4.19 55/62] tty: drop tty_schedule_flip()

Greg Kroah-Hartman
2022-07-27T16:36:52Z

From: Jiri Slaby <jslaby@suse.cz>

commit 5db96ef23bda6c2a61a51693c85b78b52d03f654 upstream.

Since commit a9c3f68f3cd8d (tty: Fix low_latency BUG) in 2014,
tty_flip_buffer_push() is only a wrapper to tty_schedule_flip(). All
users were converted in the previous patches, so remove
tty_schedule_flip() completely while inlining its body into
tty_flip_buffer_push().

One less exported function.

Reviewed-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Link: https://lore.kernel.org/r/20211122111648.30379-4-jslaby@suse.cz
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/tty/tty_buffer.c | 30 ++++++++----------------------
include/linux/tty_flip.h | 1 -
2 files changed, 8 insertions(+), 23 deletions(-)

--- a/drivers/tty/tty_buffer.c
+++ b/drivers/tty/tty_buffer.c
@@ -390,27 +390,6 @@ int __tty_insert_flip_char(struct tty_po
EXPORT_SYMBOL(__tty_insert_flip_char);

/**
- * tty_schedule_flip - push characters to ldisc
- * @port: tty port to push from
- *
- * Takes any pending buffers and transfers their ownership to the
- * ldisc side of the queue. It then schedules those characters for
- * processing by the line discipline.
- */
-
-void tty_schedule_flip(struct tty_port *port)
-{
- struct tty_bufhead *buf = &port->buf;
-
- /* paired w/ acquire in flush_to_ldisc(); ensures
- * flush_to_ldisc() sees buffer data.
- */
- smp_store_release(&buf->tail->commit, buf->tail->used);
- queue_work(system_unbound_wq, &buf->work);
-}
-EXPORT_SYMBOL(tty_schedule_flip);
-
-/**
* tty_prepare_flip_string - make room for characters
* @port: tty port
* @chars: return pointer for character write area
@@ -552,7 +531,14 @@ static void flush_to_ldisc(struct work_s

void tty_flip_buffer_push(struct tty_port *port)
{
- tty_schedule_flip(port);
+ struct tty_bufhead *buf = &port->buf;
+
+ /*
+ * Paired w/ acquire in flush_to_ldisc(); ensures flush_to_ldisc() sees
+ * buffer data.
+ */
+ smp_store_release(&buf->tail->commit, buf->tail->used);
+ queue_work(system_unbound_wq, &buf->work);
}
EXPORT_SYMBOL(tty_flip_buffer_push);

--- a/include/linux/tty_flip.h
+++ b/include/linux/tty_flip.h
@@ -12,7 +12,6 @@ extern int tty_insert_flip_string_fixed_
extern int tty_prepare_flip_string(struct tty_port *port,
unsigned char **chars, size_t size);
extern void tty_flip_buffer_push(struct tty_port *port);
-void tty_schedule_flip(struct tty_port *port);
int __tty_insert_flip_char(struct tty_port *port, unsigned char ch, char flag);

static inline int tty_insert_flip_char(struct tty_port *port,