linux-kernel - Re: [PATCH] drm/virtio: fix command submission with objects but without fence.

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Date:   Wed, 4 Sep 2019 16:10:30 -0700
From:   Chia-I Wu <olvaffe@...il.com>
To:     Gerd Hoffmann <kraxel@...hat.com>
Cc:     ML dri-devel <dri-devel@...ts.freedesktop.org>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        "open list:VIRTIO GPU DRIVER" 
        <virtualization@...ts.linux-foundation.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/virtio: fix command submission with objects but
 without fence.

On Wed, Sep 4, 2019 at 12:48 AM Gerd Hoffmann <kraxel@...hat.com> wrote:
>
> Only call virtio_gpu_array_add_fence if we actually have a fence.
>
> Fixes: da758d51968a ("drm/virtio: rework virtio_gpu_execbuffer_ioctl fencing")
> Signed-off-by: Gerd Hoffmann <kraxel@...hat.com>
> ---
>  drivers/gpu/drm/virtio/virtgpu_vq.c | 9 +++++----
>  1 file changed, 5 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/virtio/virtgpu_vq.c b/drivers/gpu/drm/virtio/virtgpu_vq.c
> index 595fa6ec2d58..7fd2851f7b97 100644
> --- a/drivers/gpu/drm/virtio/virtgpu_vq.c
> +++ b/drivers/gpu/drm/virtio/virtgpu_vq.c
> @@ -339,11 +339,12 @@ static void virtio_gpu_queue_fenced_ctrl_buffer(struct virtio_gpu_device *vgdev,
>                 goto again;
>         }
>
> -       if (fence)
> +       if (fence) {
>                 virtio_gpu_fence_emit(vgdev, hdr, fence);
> -       if (vbuf->objs) {
> -               virtio_gpu_array_add_fence(vbuf->objs, &fence->f);
> -               virtio_gpu_array_unlock_resv(vbuf->objs);
> +               if (vbuf->objs) {
> +                       virtio_gpu_array_add_fence(vbuf->objs, &fence->f);
> +                       virtio_gpu_array_unlock_resv(vbuf->objs);
> +               }
This leaks when fence == NULL and vbuf->objs != NULL (which can really
happen IIRC... not at my desk to check).


>         }
>         notify = virtio_gpu_queue_ctrl_buffer_locked(vgdev, vbuf);
>         spin_unlock(&vgdev->ctrlq.qlock);
> --
> 2.18.1
>