Reviewed-by: Deepak Rawat <drawat@xxxxxxxxxx>
>
> From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
>
> The only caller of vmw_kms_update_implicit_fb() is the page_flip
> hook which itself gets called with the plane mutex already held.
> Hence we can look at plane->state safely. Toss in a lockdep assert
> to make the situation more clear.
>
> Cc: Thomas Hellstrom <thellstrom@xxxxxxxxxx>
> Cc: Sinclair Yeh <syeh@xxxxxxxxxx>
> Cc: VMware Graphics <linux-graphics-maintainer@xxxxxxxxxx>
> Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
> Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/vmwgfx/vmwgfx_kms.c | 5 ++++-
> 1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
> b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
> index 5a824125c231..a93d290b0f35 100644
> --- a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
> +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
> @@ -2811,14 +2811,17 @@ void vmw_kms_update_implicit_fb(struct
> vmw_private *dev_priv,
> struct drm_crtc *crtc)
> {
> struct vmw_display_unit *du = vmw_crtc_to_du(crtc);
> + struct drm_plane *plane = crtc->primary;
> struct vmw_framebuffer *vfb;
>
> + lockdep_assert_held(&plane->mutex);
> +
> mutex_lock(&dev_priv->global_kms_state_mutex);
>
> if (!du->is_implicit)
> goto out_unlock;
>
> - vfb = vmw_framebuffer_to_vfb(crtc->primary->fb);
> + vfb = vmw_framebuffer_to_vfb(plane->state->fb);
> WARN_ON_ONCE(dev_priv->num_implicit != 1 &&
> dev_priv->implicit_fb != vfb);
>
> --
> 2.16.1
>
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