diff --git a/drivers/gpu/drm/nouveau/nouveau_fence.c b/drivers/gpu/drm/nouveau/nouveau_fence.c index 01290d2952ae..374a9793b85f 100644 --- a/drivers/gpu/drm/nouveau/nouveau_fence.c +++ b/drivers/gpu/drm/nouveau/nouveau_fence.c @@ -77,14 +77,17 @@ nouveau_fence_update(struct nouveau_channel *chan) spin_lock(&chan->fence.lock); - if (USE_REFCNT(dev)) - sequence = nvchan_rd32(chan, 0x48); - else - sequence = atomic_read(&chan->fence.last_sequence_irq); + /* Fetch the last sequence if the channel is still up and running */ + if (likely(!list_empty(&chan->fence.pending))) { + if (USE_REFCNT(dev)) + sequence = nvchan_rd32(chan, 0x48); + else + sequence = atomic_read(&chan->fence.last_sequence_irq); - if (chan->fence.sequence_ack == sequence) - goto out; - chan->fence.sequence_ack = sequence; + if (chan->fence.sequence_ack == sequence) + goto out; + chan->fence.sequence_ack = sequence; + } list_for_each_entry_safe(fence, tmp, &chan->fence.pending, entry) { sequence = fence->sequence;