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tty: extract tty_flip_buffer_commit() from tty_flip_buffer_push()

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commit 716b10580283fda66f2b88140e3964f8a7f9da89 upstream.

We will need this new helper in the next patch.

Cc: Hillf Danton <hdanton@sina.com>
Cc: 一只狗 <chennbnbnb@gmail.com>
Cc: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Link: https://lore.kernel.org/r/20220707082558.9250-1-jslaby@suse.cz
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jiri Slaby
2022-07-07 10:25:57 +02:00
committed by Greg Kroah-Hartman
parent c84986d097
commit a4bb7ef2d6
1 changed files with 10 additions and 5 deletions
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15
drivers/tty/tty_buffer.c
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@@ -523,6 +523,15 @@ static void flush_to_ldisc(struct work_struct *work)
} }
static inline void tty_flip_buffer_commit(struct tty_buffer *tail)
{
/*
* Paired w/ acquire in flush_to_ldisc(); ensures flush_to_ldisc() sees
* buffer data.
*/
smp_store_release(&tail->commit, tail->used);
}
/** /**
* tty_flip_buffer_push - terminal * tty_flip_buffer_push - terminal
* @port: tty port to push * @port: tty port to push
@@ -538,11 +547,7 @@ void tty_flip_buffer_push(struct tty_port *port)
{ {
struct tty_bufhead *buf = &port->buf; struct tty_bufhead *buf = &port->buf;
/* tty_flip_buffer_commit(buf->tail);
* 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); queue_work(system_unbound_wq, &buf->work);
} }
EXPORT_SYMBOL(tty_flip_buffer_push); EXPORT_SYMBOL(tty_flip_buffer_push);