drm: kill dev->context_wait

No one ever waits on this waitqueue, so the wake_up call is wasted.
Remove it all.
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Dave Airlie <airlied@gmail.com>

drivers/gpu/drm/drm_context.c

@@ -261,7 +261,6 @@ static int drm_context_switch_complete(struct drm_device *dev,
 	   when the kernel holds the lock, release
 	   that lock here. */
 	clear_bit(0, &dev->context_flag);
-	wake_up(&dev->context_wait);
 
 	return 0;
 }

drivers/gpu/drm/drm_fops.c

@@ -81,7 +81,6 @@ static int drm_setup(struct drm_device * dev)
 	dev->last_context = 0;
 	dev->last_switch = 0;
 	dev->last_checked = 0;
-	init_waitqueue_head(&dev->context_wait);
 	dev->if_version = 0;
 
 	dev->ctx_start = 0;

include/drm/drmP.h

@@ -1133,7 +1133,6 @@ struct drm_device {
 	__volatile__ long context_flag;	/**< Context swapping flag */
 	__volatile__ long interrupt_flag; /**< Interruption handler flag */
 	__volatile__ long dma_flag;	/**< DMA dispatch flag */
-	wait_queue_head_t context_wait;	/**< Processes waiting on ctx switch */
 	int last_checked;		/**< Last context checked for DMA */
 	int last_context;		/**< Last current context */
 	unsigned long last_switch;	/**< jiffies at last context switch */