drm/i915: Silence a few -Wunused-but-set-variable

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

drivers/gpu/drm/i915/i915_gem.c

@@ -1121,7 +1121,6 @@ i915_gem_mmap_ioctl(struct drm_device *dev, void *data,
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct drm_i915_gem_mmap *args = data;
 	struct drm_gem_object *obj;
-	loff_t offset;
 	unsigned long addr;
 
 	if (!(dev->driver->driver_features & DRIVER_GEM))
@@ -1136,8 +1135,6 @@ i915_gem_mmap_ioctl(struct drm_device *dev, void *data,
 		return -E2BIG;
 	}
 
-	offset = args->offset;
-
 	down_write(&current->mm->mmap_sem);
 	addr = do_mmap(obj->filp, 0, args->size,
 		       PROT_READ | PROT_WRITE, MAP_SHARED,

drivers/gpu/drm/i915/intel_display.c

@@ -4346,7 +4346,7 @@ static void intel_update_watermarks(struct drm_device *dev)
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct drm_crtc *crtc;
 	int sr_hdisplay = 0;
-	unsigned long planea_clock = 0, planeb_clock = 0, sr_clock = 0;
+	unsigned long planea_clock = 0, planeb_clock = 0;
 	int enabled = 0, pixel_size = 0;
 	int sr_htotal = 0;
 
@@ -4368,7 +4368,6 @@ static void intel_update_watermarks(struct drm_device *dev)
 				planeb_clock = crtc->mode.clock;
 			}
 			sr_hdisplay = crtc->mode.hdisplay;
-			sr_clock = crtc->mode.clock;
 			sr_htotal = crtc->mode.htotal;
 			if (crtc->fb)
 				pixel_size = crtc->fb->bits_per_pixel / 8;

drivers/gpu/drm/i915/intel_ringbuffer.c

@@ -893,6 +893,10 @@ void intel_cleanup_ring_buffer(struct intel_ring_buffer *ring)
 	/* Disable the ring buffer. The ring must be idle at this point */
 	dev_priv = ring->dev->dev_private;
 	ret = intel_wait_ring_buffer(ring, ring->size - 8);
+	if (ret)
+		DRM_ERROR("failed to quiesce %s whilst cleaning up: %d\n",
+			  ring->name, ret);
+
 	I915_WRITE_CTL(ring, 0);
 
 	drm_core_ioremapfree(&ring->map, ring->dev);