drm: Remove redundant 'flush_workqueue()' calls

'destroy_workqueue()' already drains the queue before destroying it, so
there is no need to flush it explicitly.

Remove the redundant 'flush_workqueue()' calls.

This was generated with coccinelle:

@@
expression E;
@@
- 	flush_workqueue(E);
	destroy_workqueue(E);
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Acked-by: Jyri Sarha <jyri.sarha@iki.fi>
Reviewed-by: Rob Clark <robdclark@gmail.com>
Link: https://lore.kernel.org/r/75e8ba40076ad707d47e3a3670e6b23c1b8b11bc.1633874223.git.christophe.jaillet@wanadoo.frSigned-off-by: Rob Clark <robdclark@chromium.org>

drivers/gpu/drm/etnaviv/etnaviv_gpu.c

@@ -1733,7 +1733,6 @@ static void etnaviv_gpu_unbind(struct device *dev, struct device *master,
 
 	DBG("%s", dev_name(gpu->dev));
 
-	flush_workqueue(gpu->wq);
 	destroy_workqueue(gpu->wq);
 
 	etnaviv_sched_fini(gpu);

drivers/gpu/drm/msm/dsi/dsi_host.c

@@ -1904,7 +1904,6 @@ void msm_dsi_host_destroy(struct mipi_dsi_host *host)
 	DBG("");
 	dsi_tx_buf_free(msm_host);
 	if (msm_host->workqueue) {
-		flush_workqueue(msm_host->workqueue);
 		destroy_workqueue(msm_host->workqueue);
 		msm_host->workqueue = NULL;
 	}

drivers/gpu/drm/msm/edp/edp_ctrl.c

@@ -1190,7 +1190,6 @@ void msm_edp_ctrl_destroy(struct edp_ctrl *ctrl)
 		return;
 
 	if (ctrl->workqueue) {
-		flush_workqueue(ctrl->workqueue);
 		destroy_workqueue(ctrl->workqueue);
 		ctrl->workqueue = NULL;
 	}

drivers/gpu/drm/msm/hdmi/hdmi.c

@@ -61,10 +61,8 @@ static void msm_hdmi_destroy(struct hdmi *hdmi)
 	 * at this point, hpd has been disabled,
 	 * after flush workq, it's safe to deinit hdcp
 	 */
-	if (hdmi->workq) {
-		flush_workqueue(hdmi->workq);
+	if (hdmi->workq)
 		destroy_workqueue(hdmi->workq);
-	}
 	msm_hdmi_hdcp_destroy(hdmi);
 
 	if (hdmi->phy_dev) {

drivers/gpu/drm/tilcdc/tilcdc_drv.c

@@ -186,10 +186,8 @@ static void tilcdc_fini(struct drm_device *dev)
 	if (priv->mmio)
 		iounmap(priv->mmio);
 
-	if (priv->wq) {
-		flush_workqueue(priv->wq);
+	if (priv->wq)
 		destroy_workqueue(priv->wq);
-	}
 
 	dev->dev_private = NULL;
 

drivers/gpu/drm/vmwgfx/ttm_memory.c

@@ -468,7 +468,6 @@ void ttm_mem_global_release(struct ttm_mem_global *glob)
 	struct ttm_mem_zone *zone;
 	unsigned int i;
 
-	flush_workqueue(glob->swap_queue);
 	destroy_workqueue(glob->swap_queue);
 	glob->swap_queue = NULL;
 	for (i = 0; i < glob->num_zones; ++i) {