From 072973ba67ecfc842d9d73cc003095267158fc73 Mon Sep 17 00:00:00 2001 From: Bhaktipriya Shridhar Date: Mon, 25 Jul 2016 12:05:53 -0300 Subject: [PATCH] [media] cx25821: Remove deprecated create_singlethread_workqueue The workqueue "_irq_audio_queues" runs the audio upstream handler. It has a single work item(&dev->_audio_work_entry) 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. The work item has been flushed in cx25821_stop_upstream_audio() to ensure that nothing is pending when the driver is disconnected. Signed-off-by: Bhaktipriya Shridhar Signed-off-by: Mauro Carvalho Chehab --- drivers/media/pci/cx25821/cx25821-audio-upstream.c | 14 ++------------ drivers/media/pci/cx25821/cx25821.h | 1 - 2 files changed, 2 insertions(+), 13 deletions(-) diff --git a/drivers/media/pci/cx25821/cx25821-audio-upstream.c b/drivers/media/pci/cx25821/cx25821-audio-upstream.c index 05bd957a59d0..7c8edb6181ec 100644 --- a/drivers/media/pci/cx25821/cx25821-audio-upstream.c +++ b/drivers/media/pci/cx25821/cx25821-audio-upstream.c @@ -242,8 +242,7 @@ void cx25821_stop_upstream_audio(struct cx25821_dev *dev) dev->_audioframe_count = 0; dev->_audiofile_status = END_OF_FILE; - destroy_workqueue(dev->_irq_audio_queues); - dev->_irq_audio_queues = NULL; + flush_work(&dev->_audio_work_entry); kfree(dev->_audiofilename); } @@ -446,8 +445,7 @@ static int cx25821_audio_upstream_irq(struct cx25821_dev *dev, int chan_num, dev->_audioframe_index = dev->_last_index_irq; - queue_work(dev->_irq_audio_queues, - &dev->_audio_work_entry); + schedule_work(&dev->_audio_work_entry); } if (dev->_is_first_audio_frame) { @@ -639,14 +637,6 @@ int cx25821_audio_upstream_init(struct cx25821_dev *dev, int channel_select) /* Work queue */ INIT_WORK(&dev->_audio_work_entry, cx25821_audioups_handler); - dev->_irq_audio_queues = - create_singlethread_workqueue("cx25821_audioworkqueue"); - - if (!dev->_irq_audio_queues) { - printk(KERN_DEBUG - pr_fmt("ERROR: create_singlethread_workqueue() for Audio FAILED!\n")); - return -ENOMEM; - } dev->_last_index_irq = 0; dev->_audio_is_running = 0; diff --git a/drivers/media/pci/cx25821/cx25821.h b/drivers/media/pci/cx25821/cx25821.h index 35c7375e4617..ef61dea982e8 100644 --- a/drivers/media/pci/cx25821/cx25821.h +++ b/drivers/media/pci/cx25821/cx25821.h @@ -293,7 +293,6 @@ struct cx25821_dev { u32 audio_upstream_riscbuf_size; u32 audio_upstream_databuf_size; int _audioframe_index; - struct workqueue_struct *_irq_audio_queues; struct work_struct _audio_work_entry; char *input_audiofilename; -- 2.30.2