summaryrefslogtreecommitdiff
path: root/drivers/media/i2c/adv7842.c
diff options
context:
space:
mode:
authorBhaktipriya Shridhar <bhaktipriya96@gmail.com>2016-07-02 13:37:22 +0300
committerMauro Carvalho Chehab <mchehab@s-opensource.com>2016-07-08 21:00:23 +0300
commit1d3e15436f8bf078137ff3e0146d882cb2b8e4b6 (patch)
tree2fa403201d2a375a196fab2a66e29155cce42609 /drivers/media/i2c/adv7842.c
parentedf096be837455e2d1231227ae53c0da01c1087c (diff)
downloadlinux-1d3e15436f8bf078137ff3e0146d882cb2b8e4b6.tar.xz
[media] adv7842: Remove deprecated create_singlethread_workqueue
The workqueue "work_queues" enables hotplugging. It has a single work item(&state->delayed_work_enable_hotplug) 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 sync cancelled in adv7842_remove() 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>
Diffstat (limited to 'drivers/media/i2c/adv7842.c')
-rw-r--r--drivers/media/i2c/adv7842.c16
1 files changed, 2 insertions, 14 deletions
diff --git a/drivers/media/i2c/adv7842.c b/drivers/media/i2c/adv7842.c
index 8081ef78ec05..a45e7537b936 100644
--- a/drivers/media/i2c/adv7842.c
+++ b/drivers/media/i2c/adv7842.c
@@ -118,7 +118,6 @@ struct adv7842_state {
struct v4l2_fract aspect_ratio;
u32 rgb_quantization_range;
bool is_cea_format;
- struct workqueue_struct *work_queues;
struct delayed_work delayed_work_enable_hotplug;
bool restart_stdi_once;
bool hdmi_port_a;
@@ -756,8 +755,7 @@ static int edid_write_vga_segment(struct v4l2_subdev *sd)
}
/* enable hotplug after 200 ms */
- queue_delayed_work(state->work_queues,
- &state->delayed_work_enable_hotplug, HZ / 5);
+ schedule_delayed_work(&state->delayed_work_enable_hotplug, HZ / 5);
return 0;
}
@@ -855,8 +853,7 @@ static int edid_write_hdmi_segment(struct v4l2_subdev *sd, u8 port)
}
/* enable hotplug after 200 ms */
- queue_delayed_work(state->work_queues,
- &state->delayed_work_enable_hotplug, HZ / 5);
+ schedule_delayed_work(&state->delayed_work_enable_hotplug, HZ / 5);
return 0;
}
@@ -3314,13 +3311,6 @@ static int adv7842_probe(struct i2c_client *client,
goto err_i2c;
}
- /* work queues */
- state->work_queues = create_singlethread_workqueue(client->name);
- if (!state->work_queues) {
- v4l2_err(sd, "Could not create work queue\n");
- err = -ENOMEM;
- goto err_i2c;
- }
INIT_DELAYED_WORK(&state->delayed_work_enable_hotplug,
adv7842_delayed_work_enable_hotplug);
@@ -3342,7 +3332,6 @@ err_entity:
media_entity_cleanup(&sd->entity);
err_work_queues:
cancel_delayed_work(&state->delayed_work_enable_hotplug);
- destroy_workqueue(state->work_queues);
err_i2c:
adv7842_unregister_clients(sd);
err_hdl:
@@ -3360,7 +3349,6 @@ static int adv7842_remove(struct i2c_client *client)
adv7842_irq_enable(sd, false);
cancel_delayed_work(&state->delayed_work_enable_hotplug);
- destroy_workqueue(state->work_queues);
v4l2_device_unregister_subdev(sd);
media_entity_cleanup(&sd->entity);
adv7842_unregister_clients(sd);