[media] hdpvr: Remove deprecated create_singlethread_workqueue

The workqueue "workqueue" is involved in transmitting hdpvr buffers.
It has a single work item(&dev->worker) and hence doesn't require
ordering. Also, it is not being used on a memory reclaim path. Hence,
the singlethreaded workqueue has been replaced with the use of system_wq.

System workqueues have been able to handle high level of concurrency
for a long time now and hence it's not required to have a singlethreaded
workqueue just to gain concurrency. Unlike a dedicated per-cpu workqueue
created with create_singlethread_workqueue(), system_wq allows multiple
work items to overlap executions even on the same CPU; however, a
per-cpu workqueue doesn't have any CPU locality or global ordering
guarantee unless the target CPU is explicitly specified and thus the
increase of local concurrency shouldn't make any difference.

Work item has been flushed in hdpvr_device_release() to ensure
that there are no pending tasks while disconnecting the driver.

Signed-off-by: Bhaktipriya Shridhar <bhaktipriya96@gmail.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

3 files changed, 5 insertions, 13 deletions

diff --git a/drivers/media/usb/hdpvr/hdpvr-core.c b/drivers/media/usb/hdpvr/hdpvr-core.c
index 08f0ca7aa012..a61d8fd63c12 100644
--- a/drivers/media/usb/hdpvr/hdpvr-core.c
+++ b/drivers/media/usb/hdpvr/hdpvr-core.c
@@ -310,10 +310,6 @@ static int hdpvr_probe(struct usb_interface *interface,
         init_waitqueue_head(&dev->wait_buffer);
         init_waitqueue_head(&dev->wait_data);
 
-        dev->workqueue = create_singlethread_workqueue("hdpvr_buffer");
-        if (!dev->workqueue)
-                goto error;
-
         dev->options = hdpvr_default_options;
 
         if (default_video_input < HDPVR_VIDEO_INPUTS)
@@ -404,9 +400,7 @@ reg_fail:
 #endif
 error:
         if (dev) {
-                /* Destroy single thread */
-                if (dev->workqueue)
-                        destroy_workqueue(dev->workqueue);
+                flush_work(&dev->worker);
                 /* this frees allocated memory */
                 hdpvr_delete(dev);
         }
@@ -427,7 +421,7 @@ static void hdpvr_disconnect(struct usb_interface *interface)
         mutex_unlock(&dev->io_mutex);
         v4l2_device_disconnect(&dev->v4l2_dev);
         msleep(100);
-        flush_workqueue(dev->workqueue);
+        flush_work(&dev->worker);
         mutex_lock(&dev->io_mutex);
         hdpvr_cancel_queue(dev);
         mutex_unlock(&dev->io_mutex);
diff --git a/drivers/media/usb/hdpvr/hdpvr-video.c b/drivers/media/usb/hdpvr/hdpvr-video.c
index ba7f02270c83..2a3a8b470555 100644
--- a/drivers/media/usb/hdpvr/hdpvr-video.c
+++ b/drivers/media/usb/hdpvr/hdpvr-video.c
@@ -316,7 +316,7 @@ static int hdpvr_start_streaming(struct hdpvr_device *dev)
         dev->status = STATUS_STREAMING;
 
         INIT_WORK(&dev->worker, hdpvr_transmit_buffers);
-        queue_work(dev->workqueue, &dev->worker);
+        schedule_work(&dev->worker);
 
         v4l2_dbg(MSG_BUFFER, hdpvr_debug, &dev->v4l2_dev,
                         "streaming started\n");
@@ -350,7 +350,7 @@ static int hdpvr_stop_streaming(struct hdpvr_device *dev)
         wake_up_interruptible(&dev->wait_buffer);
         msleep(50);
 
-        flush_workqueue(dev->workqueue);
+        flush_work(&dev->worker);
 
         mutex_lock(&dev->io_mutex);
         /* kill the still outstanding urbs */
@@ -1123,7 +1123,7 @@ static void hdpvr_device_release(struct video_device *vdev)
 
         hdpvr_delete(dev);
         mutex_lock(&dev->io_mutex);
-        destroy_workqueue(dev->workqueue);
+        flush_work(&dev->worker);
         mutex_unlock(&dev->io_mutex);
 
         v4l2_device_unregister(&dev->v4l2_dev);
diff --git a/drivers/media/usb/hdpvr/hdpvr.h b/drivers/media/usb/hdpvr/hdpvr.h
index 78e815441f95..a12e0af1d4e1 100644
--- a/drivers/media/usb/hdpvr/hdpvr.h
+++ b/drivers/media/usb/hdpvr/hdpvr.h
@@ -107,8 +107,6 @@ struct hdpvr_device {
         /* waitqueue for data */
         wait_queue_head_t       wait_data;
         /**/
-        struct workqueue_struct *workqueue;
-        /**/
         struct work_struct      worker;
         /* current stream owner */
         struct v4l2_fh          *owner;