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Commit f031009d authored by Jiri Slaby's avatar Jiri Slaby Committed by Greg Kroah-Hartman
Browse files

tty: extract tty_flip_buffer_commit() from tty_flip_buffer_push() 



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: default avatarJiri Slaby <jslaby@suse.cz>
Link: https://lore.kernel.org/r/20220707082558.9250-1-jslaby@suse.cz


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent e39085b8

drivers/tty/tty_buffer.c

+10 −5
Original line number Diff line number Diff line
@@ -526,6 +526,15 @@ static void flush_to_ldisc(struct work_struct *work) 
	tty_ldisc_deref(disc);

}



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

 *	@port: tty port to push
@@ -541,11 +550,7 @@ void tty_flip_buffer_push(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);

	tty_flip_buffer_commit(buf->tail);

	queue_work(system_unbound_wq, &buf->work);

}

EXPORT_SYMBOL(tty_flip_buffer_push);