linux-kernel - Re: [PATCH v3] drm/virtio: fix missing dma_fence_put() in virtio_gpu_execbuffer

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Date:   Wed, 29 Jul 2020 15:38:21 +0800
From:   Muchun Song <songmuchun@...edance.com>
To:     Xin He <hexin.op@...edance.com>, daniel@...ll.ch, airlied@...ux.ie,
        kraxel@...hat.com, sumit.semwal@...aro.org,
        LKML <linux-kernel@...r.kernel.org>,
        dri-devel@...ts.freedesktop.org,
        virtualization@...ts.linux-foundation.org
Cc:     linux-media@...r.kernel.org, linaro-mm-sig@...ts.linaro.org,
        Qi Liu <liuqi.16@...edance.com>
Subject: Re: [PATCH v3] drm/virtio: fix missing dma_fence_put() in virtio_gpu_execbuffer_ioctl()

On Tue, Jul 21, 2020 at 6:17 PM Xin He <hexin.op@...edance.com> wrote:
>
> From: Qi Liu <liuqi.16@...edance.com>
>
> We should put the reference count of the fence after calling
> virtio_gpu_cmd_submit(). So add the missing dma_fence_put().
>
> Fixes: 2cd7b6f08bc4 ("drm/virtio: add in/out fence support for explicit synchronization")
> Co-developed-by: Xin He <hexin.op@...edance.com>
> Signed-off-by: Xin He <hexin.op@...edance.com>
> Signed-off-by: Qi Liu <liuqi.16@...edance.com>
> Reviewed-by: Muchun Song <songmuchun@...edance.com>
> ---
>
> changelog in v3:
> 1) Change the subject from "drm/virtio: fixed memory leak in virtio_gpu_execbuffer_ioctl()" to
>    "drm/virtio: fix missing dma_fence_put() in virtio_gpu_execbuffer_ioctl()"
> 2) Rework the commit log
>
> changelog in v2:
> 1) Add a change description
>
>  drivers/gpu/drm/virtio/virtgpu_ioctl.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/drivers/gpu/drm/virtio/virtgpu_ioctl.c b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
> index 5df722072ba0..19c5bc01eb79 100644
> --- a/drivers/gpu/drm/virtio/virtgpu_ioctl.c
> +++ b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
> @@ -179,6 +179,7 @@ static int virtio_gpu_execbuffer_ioctl(struct drm_device *dev, void *data,
>
>         virtio_gpu_cmd_submit(vgdev, buf, exbuf->size,
>                               vfpriv->ctx_id, buflist, out_fence);
> +       dma_fence_put(&out_fence->f);
>         virtio_gpu_notify(vgdev);
>         return 0;
>
> --
> 2.21.1 (Apple Git-122.3)
>

Ping guys. Any comments or suggestions？

-- 
Yours,
Muchun