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

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Date:   Fri, 7 Aug 2020 11:00:11 +0800
From:   何鑫 <hexin.op@...edance.com>
To:     Daniel Vetter <daniel@...ll.ch>, airlied@...ux.ie,
        kraxel@...hat.com, Sumit Semwal <sumit.semwal@...aro.org>
Cc:     linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        virtualization@...ts.linux-foundation.org,
        linux-media@...r.kernel.org, Qi Liu <liuqi.16@...edance.com>,
        Muchun Song <songmuchun@...edance.com>,
        gregkh@...uxfoundation.org
Subject: Re: [PATCH v3] drm/virtio: fix missing dma_fence_put() in virtio_gpu_execbuffer_ioctl()

Xin He <hexin.op@...edance.com> 于2020年7月21日周二 下午6:17写道：
>
> 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)
>

cc Greg

--
Xin He