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[media] hdpvr: Remove deprecated create_singlethread_workqueue

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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>
This commit is contained in:
Bhaktipriya Shridhar 2016-07-02 07:47:31 -03:00 committed by Mauro Carvalho Chehab
parent 0423ff9bd4
commit 5612e191ca
3 changed files with 5 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/media/usb/hdpvr/hdpvr-core.c
View File

@ -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 @@ static int hdpvr_probe(struct usb_interface *interface,
#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);

6
drivers/media/usb/hdpvr/hdpvr-video.c
View File

@ -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);

2
drivers/media/usb/hdpvr/hdpvr.h
View File

@ -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;