linux-kernel - [PATCH 21/29] drm/tidss: crtc: Implement destroy

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20250902-drm-state-readout-v1-21-14ad5315da3f@kernel.org>
Date: Tue, 02 Sep 2025 10:32:49 +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 21/29] drm/tidss: crtc: Implement destroy_state

The tidss crtc driver implements its own state, with its own
implementation of reset and duplicate_state, but uses the default
destroy_state helper.

This somewhat works for now because the drm_crtc_state field in
tidss_crtc_state is the first field so the offset is 0, but it's pretty
fragile and it should really have its own destroy_state implementation.

Signed-off-by: Maxime Ripard <mripard@...nel.org>
---
 drivers/gpu/drm/tidss/tidss_crtc.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/tidss/tidss_crtc.c b/drivers/gpu/drm/tidss/tidss_crtc.c
index db7c5e4225e6247047087a35a2e6422950fc0111..eb431a238b11d22349d61f0e17f05994f50d5f2f 100644
--- a/drivers/gpu/drm/tidss/tidss_crtc.c
+++ b/drivers/gpu/drm/tidss/tidss_crtc.c
@@ -341,10 +341,19 @@ static void tidss_crtc_disable_vblank(struct drm_crtc *crtc)
 	tidss_irq_disable_vblank(crtc);
 
 	tidss_runtime_put(tidss);
 }
 
+static void tidss_crtc_destroy_state(struct drm_crtc *crtc,
+				     struct drm_crtc_state *state)
+{
+	struct tidss_crtc_state *tstate = to_tidss_crtc_state(state);
+
+	__drm_atomic_helper_crtc_destroy_state(&tstate->base);
+	kfree(tstate);
+}
+
 static void tidss_crtc_reset(struct drm_crtc *crtc)
 {
 	struct tidss_crtc_state *tstate;
 
 	if (crtc->state)
@@ -396,11 +405,11 @@ static const struct drm_crtc_funcs tidss_crtc_funcs = {
 	.reset = tidss_crtc_reset,
 	.destroy = tidss_crtc_destroy,
 	.set_config = drm_atomic_helper_set_config,
 	.page_flip = drm_atomic_helper_page_flip,
 	.atomic_duplicate_state = tidss_crtc_duplicate_state,
-	.atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
+	.atomic_destroy_state = tidss_crtc_destroy_state,
 	.enable_vblank = tidss_crtc_enable_vblank,
 	.disable_vblank = tidss_crtc_disable_vblank,
 };
 
 struct tidss_crtc *tidss_crtc_create(struct tidss_device *tidss,

-- 
2.50.1