[PATCH] drm/virtio: add missing virtio_gpu_array_lock_resv call

[PATCH] drm/virtio: add missing virtio_gpu_array_lock_resv call

[Gerd Hoffmann]

When submitting a fenced command we must lock the object reservations
because virtio_gpu_queue_fenced_ctrl_buffer() unlocks after adding the
fence.

Reported-by: Jann Horn <jannh@google.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 drivers/gpu/drm/virtio/virtgpu_plane.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/virtio/virtgpu_plane.c b/drivers/gpu/drm/virtio/virtgpu_plane.c
index 390524143139..1635a9ff4794 100644
--- a/drivers/gpu/drm/virtio/virtgpu_plane.c
+++ b/drivers/gpu/drm/virtio/virtgpu_plane.c
@@ -232,6 +232,7 @@ static void virtio_gpu_cursor_plane_update(struct drm_plane *plane,
 		if (!objs)
 			return;
 		virtio_gpu_array_add_obj(objs, vgfb->base.obj[0]);
+		virtio_gpu_array_lock_resv(objs);
 		virtio_gpu_cmd_transfer_to_host_2d
 			(vgdev, 0,
 			 plane->state->crtc_w,
-- 
2.18.1

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Re: [PATCH] drm/virtio: add missing virtio_gpu_array_lock_resv call

[Jann Horn]

On Fri, Jan 10, 2020 at 10:45 AM Gerd Hoffmann <kraxel@redhat.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@google.com>

> Reported-by: Jann Horn <jannh@google.com>
> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
> ---
>  drivers/gpu/drm/virtio/virtgpu_plane.c | 1 +
>  1 file changed, 1 insertion(+)
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Re: [PATCH] drm/virtio: add missing virtio_gpu_array_lock_resv call

[Chia-I Wu]

On Fri, Jan 10, 2020 at 6:27 AM Jann Horn <jannh@google.com> wrote:
>
> On Fri, Jan 10, 2020 at 10:45 AM Gerd Hoffmann <kraxel@redhat.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@google.com>
>
> > Reported-by: Jann Horn <jannh@google.com>
> > Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Chia-I Wu <olvaffe@gmail.com>
> > ---
> >  drivers/gpu/drm/virtio/virtgpu_plane.c | 1 +
> >  1 file changed, 1 insertion(+)
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