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Message-Id: <20250902-drm-state-readout-v1-5-14ad5315da3f@kernel.org>
Date: Tue, 02 Sep 2025 10:32:33 +0200
From: Maxime Ripard <mripard@...nel.org>
To: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>,
Simona Vetter <simona@...ll.ch>, Andrzej Hajda <andrzej.hajda@...el.com>,
Neil Armstrong <neil.armstrong@...aro.org>, Robert Foss <rfoss@...nel.org>,
Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
Jonas Karlman <jonas@...boo.se>, Jernej Skrabec <jernej.skrabec@...il.com>,
Jyri Sarha <jyri.sarha@....fi>,
Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
Cc: Devarsh Thakkar <devarsht@...com>, dri-devel@...ts.freedesktop.org,
linux-kernel@...r.kernel.org, Maxime Ripard <mripard@...nel.org>
Subject: [PATCH 05/29] drm/atomic_state_helper: Fix bridge state
initialization
Bridges implement their state using a drm_private_obj and an
hand-crafted reset implementation.
Since drm_private_obj doesn't have a set of reset helper like the other
states, __drm_atomic_helper_bridge_reset() was initializing both the
drm_private_state and the drm_bridge_state structures.
This initialization however was missing the drm_private_state.obj
pointer to the drm_private_obj the state was allocated for, creating a
NULL pointer dereference when trying to access it.
Fixes: 751465913f04 ("drm/bridge: Add a drm_bridge_state object")
Signed-off-by: Maxime Ripard <mripard@...nel.org>
---
drivers/gpu/drm/drm_atomic_state_helper.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/drivers/gpu/drm/drm_atomic_state_helper.c b/drivers/gpu/drm/drm_atomic_state_helper.c
index 7142e163e618ea0d7d9d828e1bd9ff2a6ec0dfeb..b962c342b16aabf4e3bea52a914e5deb1c2080ce 100644
--- a/drivers/gpu/drm/drm_atomic_state_helper.c
+++ b/drivers/gpu/drm/drm_atomic_state_helper.c
@@ -707,10 +707,17 @@ void drm_atomic_helper_connector_destroy_state(struct drm_connector *connector,
__drm_atomic_helper_connector_destroy_state(state);
kfree(state);
}
EXPORT_SYMBOL(drm_atomic_helper_connector_destroy_state);
+static void __drm_atomic_helper_private_obj_reset(struct drm_private_obj *obj,
+ struct drm_private_state *state)
+{
+ memset(state, 0, sizeof(*state));
+ state->obj = obj;
+}
+
/**
* __drm_atomic_helper_private_obj_duplicate_state - copy atomic private state
* @obj: CRTC object
* @state: new private object state
*
@@ -796,10 +803,11 @@ EXPORT_SYMBOL(drm_atomic_helper_bridge_destroy_state);
*/
void __drm_atomic_helper_bridge_reset(struct drm_bridge *bridge,
struct drm_bridge_state *state)
{
memset(state, 0, sizeof(*state));
+ __drm_atomic_helper_private_obj_reset(&bridge->base, &state->base);
state->bridge = bridge;
}
EXPORT_SYMBOL(__drm_atomic_helper_bridge_reset);
/**
--
2.50.1
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