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

[Maarten Lankhorst]

Not holding the mutex potentially causes corruption of the kernel
channel when page flipping.
Cc: sta...@vger.kernel.org #3.13
Signed-off-by: Maarten Lankhorst <maarten.lankho...@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;

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