omapfb: panel-dsi-cm: Remove deprecated create_singlethread_workqueue

The workqueue "workqueue" has only a single workitem(&ddata->ulps_work)
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.

dsicm_remove() calls dsicm_cancel_ulps_work which uses
cancel_delayed_work() 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: Tomi Valkeinen <tomi.valkeinen@ti.com>

diff --git a/drivers/video/fbdev/omap2/omapfb/displays/panel-dsi-cm.c b/drivers/video/fbdev/omap2/omapfb/displays/panel-dsi-cm.c
index b58012b..8b81069 100644 (file)
--- a/drivers/video/fbdev/omap2/omapfb/displays/panel-dsi-cm.c
+++ b/drivers/video/fbdev/omap2/omapfb/displays/panel-dsi-cm.c
@@ -75,8 +75,6 @@ struct panel_drv_data {
 
        bool intro_printed;
 
-       struct workqueue_struct *workqueue;
-
        bool ulps_enabled;
        unsigned ulps_timeout;
        struct delayed_work ulps_work;
@@ -232,7 +230,7 @@ static int dsicm_set_update_window(struct panel_drv_data *ddata,
 static void dsicm_queue_ulps_work(struct panel_drv_data *ddata)
 {
        if (ddata->ulps_timeout > 0)
-               queue_delayed_work(ddata->workqueue, &ddata->ulps_work,
+               schedule_delayed_work(&ddata->ulps_work,
                                msecs_to_jiffies(ddata->ulps_timeout));
 }
 
@@ -1244,11 +1242,6 @@ static int dsicm_probe(struct platform_device *pdev)
                dev_dbg(dev, "Using GPIO TE\n");
        }
 
-       ddata->workqueue = create_singlethread_workqueue("dsicm_wq");
-       if (ddata->workqueue == NULL) {
-               dev_err(dev, "can't create workqueue\n");
-               return -ENOMEM;
-       }
        INIT_DELAYED_WORK(&ddata->ulps_work, dsicm_ulps_work);
 
        dsicm_hw_reset(ddata);
@@ -1262,7 +1255,7 @@ static int dsicm_probe(struct platform_device *pdev)
                                dev, ddata, &dsicm_bl_ops, &props);
                if (IS_ERR(bldev)) {
                        r = PTR_ERR(bldev);
-                       goto err_bl;
+                       goto err_reg;
                }
 
                ddata->bldev = bldev;
@@ -1285,8 +1278,6 @@ static int dsicm_probe(struct platform_device *pdev)
 err_sysfs_create:
        if (bldev != NULL)
                backlight_device_unregister(bldev);
-err_bl:
-       destroy_workqueue(ddata->workqueue);
 err_reg:
        return r;
 }
@@ -1316,7 +1307,6 @@ static int __exit dsicm_remove(struct platform_device *pdev)
        omap_dss_put_device(ddata->in);
 
        dsicm_cancel_ulps_work(ddata);
-       destroy_workqueue(ddata->workqueue);
 
        /* reset, to be sure that the panel is in a valid state */
        dsicm_hw_reset(ddata);