drm/msm: remove resv fields from msm_gem_object struct

The msm_gem_object structure contains resv and _resv fields that are
no longer needed since the reservation object is now stored on
drm_gem_object. msm_atomic_prepare_fb() and msm_atomic_prepare_fb()
both referenced the wrong reservation object, and would lead to an
attempt to dereference a NULL pointer. Correct those two cases to
point to the correct reservation object.

Fixes: dd55cf69 ("drm: msm: Switch to use drm_gem_object reservation_object")
Cc: David Airlie <airlied@linux.ie>
Cc: linux-arm-msm@vger.kernel.org
Cc: dri-devel@lists.freedesktop.org
Cc: freedreno@lists.freedesktop.org
Cc: Rob Herring <robh@kernel.org>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Rob Clark <robdclark@gmail.com>
Cc: Maxime Ripard <maxime.ripard@bootlin.com>
Cc: Sean Paul <sean@poorly.run>
Acked-by: Rob Clark <robdclark@chromium.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Tested-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Brian Masney <masneyb@onstation.org>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20190513234105.7531-1-masneyb@onstation.org

drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c

@@ -780,7 +780,6 @@ static int dpu_plane_prepare_fb(struct drm_plane *plane,
 	struct dpu_plane_state *pstate = to_dpu_plane_state(new_state);
 	struct dpu_hw_fmt_layout layout;
 	struct drm_gem_object *obj;
-	struct msm_gem_object *msm_obj;
 	struct dma_fence *fence;
 	struct dpu_kms *kms = _dpu_plane_get_kms(&pdpu->base);
 	int ret;
@@ -799,8 +798,7 @@ static int dpu_plane_prepare_fb(struct drm_plane *plane,
 	 *       implicit fence and fb prepare by hand here.
 	 */
 	obj = msm_framebuffer_bo(new_state->fb, 0);
-	msm_obj = to_msm_bo(obj);
-	fence = reservation_object_get_excl_rcu(msm_obj->resv);
+	fence = reservation_object_get_excl_rcu(obj->resv);
 	if (fence)
 		drm_atomic_set_fence_for_plane(new_state, fence);
 

drivers/gpu/drm/msm/msm_atomic.c

@@ -49,15 +49,13 @@ int msm_atomic_prepare_fb(struct drm_plane *plane,
 	struct msm_drm_private *priv = plane->dev->dev_private;
 	struct msm_kms *kms = priv->kms;
 	struct drm_gem_object *obj;
-	struct msm_gem_object *msm_obj;
 	struct dma_fence *fence;
 
 	if (!new_state->fb)
 		return 0;
 
 	obj = msm_framebuffer_bo(new_state->fb, 0);
-	msm_obj = to_msm_bo(obj);
-	fence = reservation_object_get_excl_rcu(msm_obj->resv);
+	fence = reservation_object_get_excl_rcu(obj->resv);
 
 	drm_atomic_set_fence_for_plane(new_state, fence);
 

drivers/gpu/drm/msm/msm_gem.h

@@ -86,10 +86,6 @@ struct msm_gem_object {
 
 	struct llist_node freed;
 
-	/* normally (resv == &_resv) except for imported bo's */
-	struct reservation_object *resv;
-	struct reservation_object _resv;
-
 	/* For physically contiguous buffers.  Used when we don't have
 	 * an IOMMU.  Also used for stolen/splashscreen buffer.
 	 */