From: Rob Clark <robdclark@gmail.com>
To: dri-devel@lists.freedesktop.org
Cc: Sean Paul <seanpaul@chromium.org>,
Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
Rob Clark <robdclark@chromium.org>,
Maxime Ripard <mripard@kernel.org>, Sean Paul <sean@poorly.run>,
David Airlie <airlied@linux.ie>, Daniel Vetter <daniel@ffwll.ch>,
linux-kernel@vger.kernel.org (open list)
Subject: [PATCH 2/2 v2] drm/atomic: clear new_state pointers at hw_done
Date: Mon, 4 Nov 2019 09:37:37 -0800 [thread overview]
Message-ID: <20191104173737.142558-2-robdclark@gmail.com> (raw)
In-Reply-To: <20191104173737.142558-1-robdclark@gmail.com>
From: Rob Clark <robdclark@chromium.org>
The new state should not be accessed after this point. Clear the
pointers to make that explicit.
Signed-off-by: Rob Clark <robdclark@chromium.org>
---
drivers/gpu/drm/drm_atomic_helper.c | 30 +++++++++++++++++++++++++++++
1 file changed, 30 insertions(+)
diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index 648494c813e5..aec9759d9df2 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -2246,12 +2246,42 @@ EXPORT_SYMBOL(drm_atomic_helper_fake_vblank);
*/
void drm_atomic_helper_commit_hw_done(struct drm_atomic_state *old_state)
{
+ struct drm_connector *connector;
+ struct drm_connector_state *old_conn_state, *new_conn_state;
struct drm_crtc *crtc;
struct drm_crtc_state *old_crtc_state, *new_crtc_state;
+ struct drm_plane *plane;
+ struct drm_plane_state *old_plane_state, *new_plane_state;
struct drm_crtc_commit *commit;
+ struct drm_private_obj *obj;
+ struct drm_private_state *old_obj_state, *new_obj_state;
int i;
+ /*
+ * After this point, drivers should not access the permanent modeset
+ * state, so we also clear the new_state pointers to make this
+ * restriction explicit.
+ *
+ * For the CRTC state, we do this in the same loop where we signal
+ * hw_done, since we still need to new_crtc_state to fish out the
+ * commit.
+ */
+
+ for_each_oldnew_connector_in_state(old_state, connector, old_conn_state, new_conn_state, i) {
+ old_state->connectors[i].new_state = NULL;
+ }
+
+ for_each_oldnew_plane_in_state(old_state, plane, old_plane_state, new_plane_state, i) {
+ old_state->planes[i].new_state = NULL;
+ }
+
+ for_each_oldnew_private_obj_in_state(old_state, obj, old_obj_state, new_obj_state, i) {
+ old_state->private_objs[i].new_state = NULL;
+ }
+
for_each_oldnew_crtc_in_state(old_state, crtc, old_crtc_state, new_crtc_state, i) {
+ old_state->crtcs[i].new_state = NULL;
+
commit = new_crtc_state->commit;
if (!commit)
continue;
--
2.23.0
next prev parent reply other threads:[~2019-11-04 17:42 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-04 17:37 [PATCH 1/2 v2] drm/atomic: fix self-refresh helpers crtc state dereference Rob Clark
2019-11-04 17:37 ` Rob Clark [this message]
2019-11-07 8:29 ` [drm/atomic] 1c3cd2f4f9: BUG:kernel_NULL_pointer_dereference,address kernel test robot
2019-11-12 15:51 ` [PATCH 2/2 v2] drm/atomic: clear new_state pointers at hw_done Enric Balletbo Serra
2019-11-12 16:27 ` Rob Clark
2019-11-06 3:46 ` [PATCH 1/2 v2] drm/atomic: fix self-refresh helpers crtc state dereference Rob Clark
2019-11-06 18:58 ` Sean Paul
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