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drm/virtio: notify before waiting

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Before we are going to wait for virtqueue entries becoming available
call virtio_gpu_notify() to make sure the host has seen everything
we've submitted.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Chia-I Wu <olvaffe@gmail.com>
Reviewed-by: Gurchetan Singh <gurchetansingh@chromium.org>
Link: http://patchwork.freedesktop.org/patch/msgid/20200214125535.26349-3-kraxel@redhat.com
This commit is contained in:
Gerd Hoffmann 2020-02-14 13:55:31 +01:00
parent cca41da100
commit fcdd19b85c
1 changed files with 1 additions and 0 deletions
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drivers/gpu/drm/virtio/virtgpu_vq.c
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@ -346,6 +346,7 @@ static void virtio_gpu_queue_ctrl_sgs(struct virtio_gpu_device *vgdev,
if (vq->num_free < elemcnt) {
spin_unlock(&vgdev->ctrlq.qlock);
virtio_gpu_notify(vgdev);
wait_event(vgdev->ctrlq.ack_queue, vq->num_free >= elemcnt);
goto again;
}