drm/vkms: Rename vkms_output.state_lock to crc_lock

Plus add a comment about what it actually protects. It's very little.

Cc: Rodrigo Siqueira <rodrigosiqueiramelo@gmail.com>
Cc: Haneen Mohammed <hamohammed.sa@gmail.com>
Cc: Daniel Vetter <daniel@ffwll.ch>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Reviewed-by: Rodrigo Siqueira <rodrigosiqueiramelo@gmail.com>
Tested-by: Rodrigo Siqueira <rodrigosiqueiramelo@gmail.com>
Signed-off-by: Rodrigo Siqueira <rodrigosiqueiramelo@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190606222751.32567-4-daniel.vetter@ffwll.ch

drivers/gpu/drm/vkms/vkms_crc.c

@@ -168,14 +168,14 @@ void vkms_crc_work_handle(struct work_struct *work)
 	u64 frame_start, frame_end;
 	bool crc_pending;
 
-	spin_lock_irq(&out->state_lock);
+	spin_lock_irq(&out->crc_lock);
 	frame_start = crtc_state->frame_start;
 	frame_end = crtc_state->frame_end;
 	crc_pending = crtc_state->crc_pending;
 	crtc_state->frame_start = 0;
 	crtc_state->frame_end = 0;
 	crtc_state->crc_pending = false;
-	spin_unlock_irq(&out->state_lock);
+	spin_unlock_irq(&out->crc_lock);
 
 	/*
 	 * We raced with the vblank hrtimer and previous work already computed

drivers/gpu/drm/vkms/vkms_crtc.c

@@ -29,7 +29,7 @@ static enum hrtimer_restart vkms_vblank_simulate(struct hrtimer *timer)
 		/* update frame_start only if a queued vkms_crc_work_handle()
 		 * has read the data
 		 */
-		spin_lock(&output->state_lock);
+		spin_lock(&output->crc_lock);
 		if (!state->crc_pending)
 			state->frame_start = frame;
 		else
@@ -37,7 +37,7 @@ static enum hrtimer_restart vkms_vblank_simulate(struct hrtimer *timer)
 					 state->frame_start, frame);
 		state->frame_end = frame;
 		state->crc_pending = true;
-		spin_unlock(&output->state_lock);
+		spin_unlock(&output->crc_lock);
 
 		ret = queue_work(output->crc_workq, &state->crc_work);
 		if (!ret)
@@ -225,7 +225,7 @@ int vkms_crtc_init(struct drm_device *dev, struct drm_crtc *crtc,
 	drm_crtc_helper_add(crtc, &vkms_crtc_helper_funcs);
 
 	spin_lock_init(&vkms_out->lock);
-	spin_lock_init(&vkms_out->state_lock);
+	spin_lock_init(&vkms_out->crc_lock);
 
 	vkms_out->crc_workq = alloc_ordered_workqueue("vkms_crc_workq", 0);
 	if (!vkms_out->crc_workq)

drivers/gpu/drm/vkms/vkms_drv.h

@@ -49,6 +49,7 @@ struct vkms_crtc_state {
 	struct drm_crtc_state base;
 	struct work_struct crc_work;
 
+	/* below three are protected by vkms_output.crc_lock */
 	bool crc_pending;
 	u64 frame_start;
 	u64 frame_end;
@@ -66,8 +67,8 @@ struct vkms_output {
 	struct workqueue_struct *crc_workq;
 	/* protects concurrent access to crc_data */
 	spinlock_t lock;
-	/* protects concurrent access to crtc_state */
-	spinlock_t state_lock;
+
+	spinlock_t crc_lock;
 };
 
 struct vkms_device {