Re: [PATCH 2/3] drm/virtio: rework virtio_fence_signaled

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On Mon, Nov 23, 2020 at 06:19:01PM -0800, Gurchetan Singh wrote:
virtio_gpu_fence_event_process sets the last_fence_id and
subsequently calls dma_fence_signal_locked(..).

dma_fence_signal_locked(..) sets DMA_FENCE_FLAG_SIGNALED_BIT,
which is actually checked before &dma_fence_ops.(*signaled) is
called.

The check for last_fence_id is therefore a bit redundant, and
it will not be sufficient to check the last_fence_id for multiple
synchronization timelines.  Remove it.

Signed-off-by: Gurchetan Singh <gurchetansingh@xxxxxxxxxxxx>
Reviewed-by: Anthoine Bourgeois <anthoine.bourgeois@xxxxxxxxx>
---
drivers/gpu/drm/virtio/virtgpu_fence.c | 12 ++++--------
1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/virtio/virtgpu_fence.c b/drivers/gpu/drm/virtio/virtgpu_fence.c
index 586034c90587..b35fcd1d02d7 100644
--- a/drivers/gpu/drm/virtio/virtgpu_fence.c
+++ b/drivers/gpu/drm/virtio/virtgpu_fence.c
@@ -42,14 +42,10 @@ static const char *virtio_gpu_get_timeline_name(struct dma_fence *f)

static bool virtio_gpu_fence_signaled(struct dma_fence *f)
{
-	struct virtio_gpu_fence *fence = to_virtio_gpu_fence(f);
-
-	if (WARN_ON_ONCE(fence->f.seqno == 0))
-		/* leaked fence outside driver before completing
-		 * initialization with virtio_gpu_fence_emit */
-		return false;
-	if (atomic64_read(&fence->drv->last_fence_id) >= fence->f.seqno)
-		return true;
+	/* leaked fence outside driver before completing
+	 * initialization with virtio_gpu_fence_emit.
+	 */
+	WARN_ON_ONCE(f->seqno == 0);
	return false;
}

--
2.29.2.454.gaff20da3a2-goog

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