linux-kernel - Re: [PATCH 3/3] auxdisplay: ht16k33: remove private workqueue

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Date:   Wed, 8 Feb 2017 17:52:18 +0100
From:   Robin van der Gracht <robin@...tonic.nl>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     Miguel Ojeda Sandonis <miguel.ojeda.sandonis@...il.com>,
        linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linus Walleij <linus.walleij@...aro.org>
Subject: Re: [PATCH 3/3] auxdisplay: ht16k33: remove private workqueue

On Tue, 31 Jan 2017 12:54:38 -0800
Dmitry Torokhov <dmitry.torokhov@...il.com> wrote:

> There is no need for the driver to user private workqueue, standard system
> workqueue should suffice as they going to use the same worker pool anyway.
> 
> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
> ---
>  drivers/auxdisplay/ht16k33.c | 20 +++++---------------
>  1 file changed, 5 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/auxdisplay/ht16k33.c b/drivers/auxdisplay/ht16k33.c
> index b2fbe68c7fa9..533886a59cec 100644
> --- a/drivers/auxdisplay/ht16k33.c
> +++ b/drivers/auxdisplay/ht16k33.c
> @@ -80,7 +80,6 @@ struct ht16k33_priv {
>  	struct i2c_client *client;
>  	struct ht16k33_keypad keypad;
>  	struct ht16k33_fbdev fbdev;
> -	struct workqueue_struct *workqueue;
>  };
>  
>  static struct fb_fix_screeninfo ht16k33_fb_fix = {
> @@ -126,8 +125,8 @@ static void ht16k33_fb_queue(struct ht16k33_priv *priv)
>  {
>  	struct ht16k33_fbdev *fbdev = &priv->fbdev;
>  
> -	queue_delayed_work(priv->workqueue, &fbdev->work,
> -		msecs_to_jiffies(HZ / fbdev->refresh_rate));
> +	schedule_delayed_work(&fbdev->work,
> +			      msecs_to_jiffies(HZ / fbdev->refresh_rate));
>  }
>  
>  /*
> @@ -414,21 +413,15 @@ static int ht16k33_probe(struct i2c_client *client,
>  	i2c_set_clientdata(client, priv);
>  	fbdev = &priv->fbdev;
>  
> -	priv->workqueue = create_singlethread_workqueue(DRIVER_NAME "-wq");
> -	if (priv->workqueue == NULL)
> -		return -ENOMEM;
> -
>  	err = ht16k33_initialize(priv);
>  	if (err)
> -		goto err_destroy_wq;
> +		return err;
>  
>  	/* Framebuffer (2 bytes per column) */
>  	BUILD_BUG_ON(PAGE_SIZE < HT16K33_FB_SIZE);
>  	fbdev->buffer = (unsigned char *) get_zeroed_page(GFP_KERNEL);
> -	if (!fbdev->buffer) {
> -		err = -ENOMEM;
> -		goto err_destroy_wq;
> -	}
> +	if (!fbdev->buffer)
> +		return -ENOMEM;
>  
>  	fbdev->cache = devm_kmalloc(&client->dev, HT16K33_FB_SIZE, GFP_KERNEL);
>  	if (!fbdev->cache) {
> @@ -505,8 +498,6 @@ static int ht16k33_probe(struct i2c_client *client,
>  	framebuffer_release(fbdev->info);
>  err_fbdev_buffer:
>  	free_page((unsigned long) fbdev->buffer);
> -err_destroy_wq:
> -	destroy_workqueue(priv->workqueue);
>  
>  	return err;
>  }
> @@ -521,7 +512,6 @@ static int ht16k33_remove(struct i2c_client *client)
>  	framebuffer_release(fbdev->info);
>  	free_page((unsigned long) fbdev->buffer);
>  
> -	destroy_workqueue(priv->workqueue);
>  	return 0;
>  }
>  

Acked-by: Robin van der Gracht <robin@...tonic.nl>