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authorBhaktipriya Shridhar <bhaktipriya96@gmail.com>2016-08-30 22:44:51 +0530
committerMichael Ellerman <mpe@ellerman.id.au>2017-12-04 15:01:08 +1100
commitf0200c02883367f0eb6c9e2f19a8ab6335a52b86 (patch)
tree1f134b60e94a40451cf3fcbb323b6f6405d3dfec /drivers/ps3
parent0aa8ff9b76282300d16e0a1403b115996ff88a4c (diff)
ps3: Remove deprecated create_singlethread_workqueue
The workqueue "ps3av->wq" queues a single work item &ps3av->work and hence doesn't require ordering. It is involved in waking up ps3avd to do the video mode setting and hence it's not being used on a memory reclaim path. Hence, it has been converted to use 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 ps3av_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: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'drivers/ps3')
-rw-r--r--drivers/ps3/ps3av.c11
1 files changed, 2 insertions, 9 deletions
diff --git a/drivers/ps3/ps3av.c b/drivers/ps3/ps3av.c
index 437fc35beb7b..e293606b0334 100644
--- a/drivers/ps3/ps3av.c
+++ b/drivers/ps3/ps3av.c
@@ -44,7 +44,6 @@ static struct ps3av {
struct mutex mutex;
struct work_struct work;
struct completion done;
- struct workqueue_struct *wq;
int open_count;
struct ps3_system_bus_device *dev;
@@ -485,7 +484,7 @@ static int ps3av_set_videomode(void)
ps3av_set_av_video_mute(PS3AV_CMD_MUTE_ON);
/* wake up ps3avd to do the actual video mode setting */
- queue_work(ps3av->wq, &ps3av->work);
+ schedule_work(&ps3av->work);
return 0;
}
@@ -956,11 +955,6 @@ static int ps3av_probe(struct ps3_system_bus_device *dev)
INIT_WORK(&ps3av->work, ps3avd);
init_completion(&ps3av->done);
complete(&ps3av->done);
- ps3av->wq = create_singlethread_workqueue("ps3avd");
- if (!ps3av->wq) {
- res = -ENOMEM;
- goto fail;
- }
switch (ps3_os_area_get_av_multi_out()) {
case PS3_PARAM_AV_MULTI_OUT_NTSC:
@@ -1018,8 +1012,7 @@ static int ps3av_remove(struct ps3_system_bus_device *dev)
dev_dbg(&dev->core, " -> %s:%d\n", __func__, __LINE__);
if (ps3av) {
ps3av_cmd_fin();
- if (ps3av->wq)
- destroy_workqueue(ps3av->wq);
+ flush_work(&ps3av->work);
kfree(ps3av);
ps3av = NULL;
}

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