video/msm_fb: use system_wq instead of dedicated workqueues

With cmwq, there's no reason to use separate workqueues.  Drop
msmfb_info->resume_workqueue and use system_wq instead.
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Stanislaw Gruszka <stf_xl@wp.pl>
Cc: linux-usb@vger.kernel.org
Signed-off-by: David Brown <davidb@codeaurora.org>

drivers/video/msm/msm_fb.c

@@ -81,7 +81,6 @@ struct msmfb_info {
 	spinlock_t update_lock;
 	struct mutex panel_init_lock;
 	wait_queue_head_t frame_wq;
-	struct workqueue_struct *resume_workqueue;
 	struct work_struct resume_work;
 	struct msmfb_callback dma_callback;
 	struct msmfb_callback vsync_callback;
@@ -111,7 +110,7 @@ static void msmfb_handle_dma_interrupt(struct msmfb_callback *callback)
 	if (msmfb->sleeping == UPDATING &&
 	    msmfb->frame_done == msmfb->update_frame) {
 		DLOG(SUSPEND_RESUME, "full update completed\n");
-		queue_work(msmfb->resume_workqueue, &msmfb->resume_work);
+		schedule_work(&msmfb->resume_work);
 	}
 	spin_unlock_irqrestore(&msmfb->update_lock, irq_flags);
 	wake_up(&msmfb->frame_wq);
@@ -559,12 +558,6 @@ static int msmfb_probe(struct platform_device *pdev)
 	spin_lock_init(&msmfb->update_lock);
 	mutex_init(&msmfb->panel_init_lock);
 	init_waitqueue_head(&msmfb->frame_wq);
-	msmfb->resume_workqueue = create_workqueue("panel_on");
-	if (msmfb->resume_workqueue == NULL) {
-		printk(KERN_ERR "failed to create panel_on workqueue\n");
-		ret = -ENOMEM;
-		goto error_create_workqueue;
-	}
 	INIT_WORK(&msmfb->resume_work, power_on_panel);
 	msmfb->black = kzalloc(msmfb->fb->var.bits_per_pixel*msmfb->xres,
 			       GFP_KERNEL);
@@ -589,8 +582,6 @@ static int msmfb_probe(struct platform_device *pdev)
 	return 0;
 
 error_register_framebuffer:
-	destroy_workqueue(msmfb->resume_workqueue);
-error_create_workqueue:
 	iounmap(fb->screen_base);
 error_setup_fbmem:
 	framebuffer_release(msmfb->fb);