linux-kernel - Re: [PATCH v1 1/3] drivers/tty: refactor functions for flushing/queuing work

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Date:   Mon, 11 Mar 2019 09:16:59 +0100
From:   Alexander Sverdlin <alexander.sverdlin@...il.com>
To:     Oleksij Rempel <o.rempel@...gutronix.de>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>,
        Steven Walter <stevenrwalter@...il.com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 1/3] drivers/tty: refactor functions for
 flushing/queuing work

Hello Oleksij,

On Thu, 10 Jan 2019 11:12:30 +0100
Oleksij Rempel <o.rempel@...gutronix.de> wrote:

> From: Steven Walter <stevenrwalter@...il.com>
> 
> Preparation for converting to kthread_worker
> 
> Signed-off-by: Steven Walter <stevenrwalter@...il.com>
> Tested-by: Oleksij Rempel <o.rempel@...gutronix.de>

Tested-by: Alexander Sverdlin <alexander.sverdlin@...il.com>

> ---
>  drivers/tty/tty_buffer.c | 12 +++++++++---
>  include/linux/tty.h      |  1 +
>  2 files changed, 10 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/tty/tty_buffer.c b/drivers/tty/tty_buffer.c
> index 77070c2d1240..e0090e65d83a 100644
> --- a/drivers/tty/tty_buffer.c
> +++ b/drivers/tty/tty_buffer.c
> @@ -72,7 +72,7 @@ void tty_buffer_unlock_exclusive(struct tty_port *port)
>  	atomic_dec(&buf->priority);
>  	mutex_unlock(&buf->lock);
>  	if (restart)
> -		queue_work(system_unbound_wq, &buf->work);
> +		tty_buffer_queue_work(port);
>  }
>  EXPORT_SYMBOL_GPL(tty_buffer_unlock_exclusive);
>  
> @@ -410,7 +410,7 @@ void tty_schedule_flip(struct tty_port *port)
>  	 * flush_to_ldisc() sees buffer data.
>  	 */
>  	smp_store_release(&buf->tail->commit, buf->tail->used);
> -	queue_work(system_unbound_wq, &buf->work);
> +	tty_buffer_queue_work(port);
>  }
>  EXPORT_SYMBOL(tty_schedule_flip);
>  
> @@ -557,6 +557,12 @@ void tty_flip_buffer_push(struct tty_port *port)
>  }
>  EXPORT_SYMBOL(tty_flip_buffer_push);
>  
> +bool tty_buffer_queue_work(struct tty_port *port)
> +{
> +	struct tty_bufhead *buf = &port->buf;
> +	return schedule_work(&buf->work);
> +}
> +
>  /**
>   *	tty_buffer_init		-	prepare a tty buffer structure
>   *	@tty: tty to initialise
> @@ -605,7 +611,7 @@ void tty_buffer_set_lock_subclass(struct tty_port *port)
>  
>  bool tty_buffer_restart_work(struct tty_port *port)
>  {
> -	return queue_work(system_unbound_wq, &port->buf.work);
> +	return tty_buffer_queue_work(port);
>  }
>  
>  bool tty_buffer_cancel_work(struct tty_port *port)
> diff --git a/include/linux/tty.h b/include/linux/tty.h
> index bfa4e2ee94a9..226a9eff0766 100644
> --- a/include/linux/tty.h
> +++ b/include/linux/tty.h
> @@ -507,6 +507,7 @@ extern void session_clear_tty(struct pid *session);
>  extern void no_tty(void);
>  extern void tty_buffer_free_all(struct tty_port *port);
>  extern void tty_buffer_flush(struct tty_struct *tty, struct tty_ldisc *ld);
> +extern bool tty_buffer_queue_work(struct tty_port *port);
>  extern void tty_buffer_init(struct tty_port *port);
>  extern void tty_buffer_set_lock_subclass(struct tty_port *port);
>  extern bool tty_buffer_restart_work(struct tty_port *port);


-- 
Alexander Sverdlin.