[PATCH 1/2] drm/nouveau: hold mutex while syncing to kernel channel

[Maarten Lankhorst <maarten.lankhorst@canonical.com>]

Not holding the mutex potentially causes corruption of the kernel
channel when page flipping.

Cc: stable@vger.kernel.org #3.13
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
---
diff --git a/drivers/gpu/drm/nouveau/nouveau_display.c b/drivers/gpu/drm/nouveau/nouveau_display.c
index 29c3efdfc7dd..76e3cf025c10 100644
--- a/drivers/gpu/drm/nouveau/nouveau_display.c
+++ b/drivers/gpu/drm/nouveau/nouveau_display.c
@@ -603,6 +603,14 @@ nouveau_crtc_page_flip(struct drm_crtc *crtc, struct drm_framebuffer *fb,
  	if (!s)
  		return -ENOMEM;
  
+	if (new_bo != old_bo) {
+		ret = nouveau_bo_pin(new_bo, TTM_PL_FLAG_VRAM);
+		if (ret)
+			goto fail_free;
+	}
+
+	mutex_lock(&chan->cli->mutex);
+
  	/* synchronise rendering channel with the kernel's channel */
  	spin_lock(&new_bo->bo.bdev->fence_lock);
  	fence = nouveau_fence_ref(new_bo->bo.sync_obj);
@@ -612,13 +620,6 @@ nouveau_crtc_page_flip(struct drm_crtc *crtc, struct drm_framebuffer *fb,
  	if (ret)
  		return ret;
  
-	if (new_bo != old_bo) {
-		ret = nouveau_bo_pin(new_bo, TTM_PL_FLAG_VRAM);
-		if (ret)
-			goto fail_free;
-	}
-
-	mutex_lock(&chan->cli->mutex);
  	ret = ttm_bo_reserve(&old_bo->bo, true, false, false, NULL);
  	if (ret)
  		goto fail_unpin;