linux-kernel - [PATCH] drm/msm: use kthread_create_worker instead of kthread

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Message-Id: <20200714142034.23843-1-bernard@vivo.com>
Date:   Tue, 14 Jul 2020 22:20:29 +0800
From:   Bernard Zhao <bernard@...o.com>
To:     Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Drew Davenport <ddavenport@...omium.org>,
        Bernard Zhao <bernard@...o.com>,
        Hongbo Yao <yaohongbo@...wei.com>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Kalyan Thota <kalyan_t@...eaurora.org>,
        linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Cc:     opensource.kernel@...o.com
Subject: [PATCH] drm/msm: use kthread_create_worker instead of kthread_run

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 <bernard@...o.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