[Resend][PATCH] drm/msm: use kthread_create_worker instead of kthread_run

[Bernard]

Use kthread_create_worker to simplify the code and optimise
the manager struct: msm_drm_thread. With this change, we
could remove struct element (struct task_struct *thread &
struct kthread_worker worker), instead, use one point (struct
kthread_worker *worker).

Signed-off-by: Bernard Zhao <bern...@vivo.com>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c |  2 +-
 drivers/gpu/drm/msm/msm_drv.c            | 18 ++++++------------
 drivers/gpu/drm/msm/msm_drv.h            |  3 +--
 3 files changed, 8 insertions(+), 15 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c 
b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
index e15b42a780e0..c959c959021d 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
@@ -396,7 +396,7 @@ static void dpu_crtc_frame_event_cb(void *data, u32 event)
        fevent->event = event;
        fevent->crtc = crtc;
        fevent->ts = ktime_get();
-       kthread_queue_work(&priv->event_thread[crtc_id].worker, &fevent->work);
+       kthread_queue_work(priv->event_thread[crtc_id].worker, &fevent->work);
 }
 
 void dpu_crtc_complete_commit(struct drm_crtc *crtc)
diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
index f6ce40bf3699..82e79b82a594 100644
--- a/drivers/gpu/drm/msm/msm_drv.c
+++ b/drivers/gpu/drm/msm/msm_drv.c
@@ -238,10 +238,8 @@ static int msm_drm_uninit(struct device *dev)
 
        /* clean up event worker threads */
        for (i = 0; i < priv->num_crtcs; i++) {
-               if (priv->event_thread[i].thread) {
-                       kthread_destroy_worker(&priv->event_thread[i].worker);
-                       priv->event_thread[i].thread = NULL;
-               }
+               if (priv->event_thread[i].worker)
+                       kthread_destroy_worker(priv->event_thread[i].worker);
        }
 
        msm_gem_shrinker_cleanup(ddev);
@@ -504,19 +502,15 @@ static int msm_drm_init(struct device *dev, struct 
drm_driver *drv)
        for (i = 0; i < priv->num_crtcs; i++) {
                /* initialize event thread */
                priv->event_thread[i].crtc_id = priv->crtcs[i]->base.id;
-               kthread_init_worker(&priv->event_thread[i].worker);
                priv->event_thread[i].dev = ddev;
-               priv->event_thread[i].thread =
-                       kthread_run(kthread_worker_fn,
-                               &priv->event_thread[i].worker,
-                               "crtc_event:%d", priv->event_thread[i].crtc_id);
-               if (IS_ERR(priv->event_thread[i].thread)) {
+               priv->event_thread[i].worker = kthread_create_worker(0,
+                       "crtc_event:%d", priv->event_thread[i].crtc_id);
+               if (IS_ERR(priv->event_thread[i].worker)) {
                        DRM_DEV_ERROR(dev, "failed to create crtc_event 
kthread\n");
-                       priv->event_thread[i].thread = NULL;
                        goto err_msm_uninit;
                }
 
-               ret = sched_setscheduler(priv->event_thread[i].thread,
+               ret = sched_setscheduler(priv->event_thread[i].worker->task,
                                         SCHED_FIFO, &param);
                if (ret)
                        dev_warn(dev, "event_thread set priority failed:%d\n",
diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h
index e2d6a6056418..daf2f4e5548c 100644
--- a/drivers/gpu/drm/msm/msm_drv.h
+++ b/drivers/gpu/drm/msm/msm_drv.h
@@ -129,9 +129,8 @@ struct msm_display_info {
 /* Commit/Event thread specific structure */
 struct msm_drm_thread {
        struct drm_device *dev;
-       struct task_struct *thread;
        unsigned int crtc_id;
-       struct kthread_worker worker;
+       struct kthread_worker *worker;
 };
 
 struct msm_drm_private {
-- 
2.17.1