linux-kernel - Re: [PATCH 04/10] drm/virtio: annotate virtio_gpu_queue_ctrl_buffer

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Message-ID: <708d9c01-5a59-3d78-37c4-7cb848b50f3a@redhat.com>
Date:   Wed, 7 Dec 2016 12:15:44 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>, linux-kernel@...r.kernel.org
Cc:     David Airlie <airlied@...ux.ie>, Gerd Hoffmann <kraxel@...hat.com>,
        dri-devel@...ts.freedesktop.org,
        virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH 04/10] drm/virtio: annotate
 virtio_gpu_queue_ctrl_buffer_locked



On 2016年12月06日 23:40, Michael S. Tsirkin wrote:
> virtio_gpu_queue_ctrl_buffer_locked is called with ctrlq.qlock taken, it
> releases and acquires this lock.  This causes a sparse warning.  Add
> appropriate annotations for sparse context checking.
>
> Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
> ---
>   drivers/gpu/drm/virtio/virtgpu_vq.c | 2 ++
>   1 file changed, 2 insertions(+)
>
> diff --git a/drivers/gpu/drm/virtio/virtgpu_vq.c b/drivers/gpu/drm/virtio/virtgpu_vq.c
> index 2f0c2f9..a6e2ce4 100644
> --- a/drivers/gpu/drm/virtio/virtgpu_vq.c
> +++ b/drivers/gpu/drm/virtio/virtgpu_vq.c
> @@ -297,6 +297,8 @@ void virtio_gpu_dequeue_cursor_func(struct work_struct *work)
>   
>   static int virtio_gpu_queue_ctrl_buffer_locked(struct virtio_gpu_device *vgdev,
>   					       struct virtio_gpu_vbuffer *vbuf)
> +		__releases(&vgdev->ctrlq.qlock)
> +		__acquires(&vgdev->ctrlq.qlock)
>   {
>   	struct virtqueue *vq = vgdev->ctrlq.vq;
>   	struct scatterlist *sgs[3], vcmd, vout, vresp;

Reviewed-by: Jason Wang <jasowang@...hat.com>