From 29a3006e5209b5dde2d370b8de1e8c18c14040e7 Mon Sep 17 00:00:00 2001 From: Bhaktipriya Shridhar Date: Sat, 16 Jul 2016 05:32:34 -0300 Subject: [PATCH] [media] pvrusb2: Remove deprecated create_singlethread_workqueue The workqueue "workqueue" is involved in polling the pvrusb2 hardware (pvr2_hdw). It has a single work item(&hdw->workpoll) 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 pvr2_hdw_destroy to ensure that there are no pending tasks while disconnecting the driver. Signed-off-by: Bhaktipriya Shridhar Acked-by: Tejun Heo Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab --- .../media/usb/pvrusb2/pvrusb2-hdw-internal.h | 1 - drivers/media/usb/pvrusb2/pvrusb2-hdw.c | 23 ++++++------------- 2 files changed, 7 insertions(+), 17 deletions(-) diff --git a/drivers/media/usb/pvrusb2/pvrusb2-hdw-internal.h b/drivers/media/usb/pvrusb2/pvrusb2-hdw-internal.h index 60141b16d731..23473a21319c 100644 --- a/drivers/media/usb/pvrusb2/pvrusb2-hdw-internal.h +++ b/drivers/media/usb/pvrusb2/pvrusb2-hdw-internal.h @@ -170,7 +170,6 @@ struct pvr2_hdw { const struct pvr2_device_desc *hdw_desc; /* Kernel worker thread handling */ - struct workqueue_struct *workqueue; struct work_struct workpoll; /* Update driver state */ /* Video spigot */ diff --git a/drivers/media/usb/pvrusb2/pvrusb2-hdw.c b/drivers/media/usb/pvrusb2/pvrusb2-hdw.c index fe20fe4f2330..1eb4f7ba2967 100644 --- a/drivers/media/usb/pvrusb2/pvrusb2-hdw.c +++ b/drivers/media/usb/pvrusb2/pvrusb2-hdw.c @@ -2624,7 +2624,6 @@ struct pvr2_hdw *pvr2_hdw_create(struct usb_interface *intf, if (cnt1 >= sizeof(hdw->name)) cnt1 = sizeof(hdw->name)-1; hdw->name[cnt1] = 0; - hdw->workqueue = create_singlethread_workqueue(hdw->name); INIT_WORK(&hdw->workpoll,pvr2_hdw_worker_poll); pvr2_trace(PVR2_TRACE_INIT,"Driver unit number is %d, name is %s", @@ -2651,11 +2650,7 @@ struct pvr2_hdw *pvr2_hdw_create(struct usb_interface *intf, del_timer_sync(&hdw->decoder_stabilization_timer); del_timer_sync(&hdw->encoder_run_timer); del_timer_sync(&hdw->encoder_wait_timer); - if (hdw->workqueue) { - flush_workqueue(hdw->workqueue); - destroy_workqueue(hdw->workqueue); - hdw->workqueue = NULL; - } + flush_work(&hdw->workpoll); usb_free_urb(hdw->ctl_read_urb); usb_free_urb(hdw->ctl_write_urb); kfree(hdw->ctl_read_buffer); @@ -2712,11 +2707,7 @@ void pvr2_hdw_destroy(struct pvr2_hdw *hdw) { if (!hdw) return; pvr2_trace(PVR2_TRACE_INIT,"pvr2_hdw_destroy: hdw=%p",hdw); - if (hdw->workqueue) { - flush_workqueue(hdw->workqueue); - destroy_workqueue(hdw->workqueue); - hdw->workqueue = NULL; - } + flush_work(&hdw->workpoll); del_timer_sync(&hdw->quiescent_timer); del_timer_sync(&hdw->decoder_stabilization_timer); del_timer_sync(&hdw->encoder_run_timer); @@ -4443,7 +4434,7 @@ static void pvr2_hdw_quiescent_timeout(unsigned long data) hdw->state_decoder_quiescent = !0; trace_stbit("state_decoder_quiescent",hdw->state_decoder_quiescent); hdw->state_stale = !0; - queue_work(hdw->workqueue,&hdw->workpoll); + schedule_work(&hdw->workpoll); } @@ -4454,7 +4445,7 @@ static void pvr2_hdw_decoder_stabilization_timeout(unsigned long data) hdw->state_decoder_ready = !0; trace_stbit("state_decoder_ready", hdw->state_decoder_ready); hdw->state_stale = !0; - queue_work(hdw->workqueue, &hdw->workpoll); + schedule_work(&hdw->workpoll); } @@ -4465,7 +4456,7 @@ static void pvr2_hdw_encoder_wait_timeout(unsigned long data) hdw->state_encoder_waitok = !0; trace_stbit("state_encoder_waitok",hdw->state_encoder_waitok); hdw->state_stale = !0; - queue_work(hdw->workqueue,&hdw->workpoll); + schedule_work(&hdw->workpoll); } @@ -4477,7 +4468,7 @@ static void pvr2_hdw_encoder_run_timeout(unsigned long data) hdw->state_encoder_runok = !0; trace_stbit("state_encoder_runok",hdw->state_encoder_runok); hdw->state_stale = !0; - queue_work(hdw->workqueue,&hdw->workpoll); + schedule_work(&hdw->workpoll); } } @@ -4991,7 +4982,7 @@ static void pvr2_hdw_state_sched(struct pvr2_hdw *hdw) if (hdw->state_stale) return; hdw->state_stale = !0; trace_stbit("state_stale",hdw->state_stale); - queue_work(hdw->workqueue,&hdw->workpoll); + schedule_work(&hdw->workpoll); }