linux-kernel - Re: [PATCH] drm/virtio: add missing virtio_gpu_array_lock

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Date:   Fri, 10 Jan 2020 13:02:17 -0800
From:   Chia-I Wu <olvaffe@...il.com>
To:     Jann Horn <jannh@...gle.com>
Cc:     Gerd Hoffmann <kraxel@...hat.com>,
        ML dri-devel <dri-devel@...ts.freedesktop.org>,
        Gurchetan Singh <gurchetansingh@...omium.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: add missing virtio_gpu_array_lock_resv call

On Fri, Jan 10, 2020 at 6:27 AM Jann Horn <jannh@...gle.com> wrote:
>
> On Fri, Jan 10, 2020 at 10:45 AM Gerd Hoffmann <kraxel@...hat.com> wrote:
> > When submitting a fenced command we must lock the object reservations
> > because virtio_gpu_queue_fenced_ctrl_buffer() unlocks after adding the
> > fence.
>
> Thanks a lot! With this patch applied, my VM doesn't throw lockdep
> warnings anymore. If you want, you can add:
>
> Tested-by: Jann Horn <jannh@...gle.com>
>
> > Reported-by: Jann Horn <jannh@...gle.com>
> > Signed-off-by: Gerd Hoffmann <kraxel@...hat.com>
Reviewed-by: Chia-I Wu <olvaffe@...il.com>
> > ---
> >  drivers/gpu/drm/virtio/virtgpu_plane.c | 1 +
> >  1 file changed, 1 insertion(+)