auxdisplay: ht16k33: remove private workqueue

There is no need for the driver to use private workqueue, standard system
workqueue should suffice as they are going to use the same worker pool
anyway.

Acked-by: Robin van der Gracht <robin@protonic.nl>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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 @@ err_fbdev_info:
 	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;
 }