linux-kernel - [PATCH v2 06/11] drm: Use state helper instead of plane state pointer in atomic

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: <20210121163537.1466118-6-maxime@cerno.tech>
Date:   Thu, 21 Jan 2021 17:35:31 +0100
From:   Maxime Ripard <maxime@...no.tech>
To:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Maxime Ripard <maxime@...no.tech>,
        Daniel Vetter <daniel.vetter@...el.com>,
        David Airlie <airlied@...ux.ie>
Cc:     dri-devel@...ts.freedesktop.org,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Daniel Vetter <daniel@...ll.ch>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>,
        Jyri Sarha <jyri.sarha@....fi>,
        Tomi Valkeinen <tomba@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, freedreno@...ts.freedesktop.org
Subject: [PATCH v2 06/11] drm: Use state helper instead of plane state pointer in atomic_check

Many drivers reference the plane->state pointer in order to get the
current plane state in their atomic_check hook, which would be the old
plane state in the global atomic state since _swap_state hasn't happened
when atomic_check is run.

Use the drm_atomic_get_old_plane_state helper to get that state to make
it more obvious.

This was made using the coccinelle script below:

@ plane_atomic_func @
identifier helpers;
identifier func;
@@

static struct drm_plane_helper_funcs helpers = {
	...,
	.atomic_check = func,
	...,
};

@ replaces_old_state @
identifier plane_atomic_func.func;
identifier plane, state, plane_state;
@@

 func(struct drm_plane *plane, struct drm_atomic_state *state) {
 	...
-	struct drm_plane_state *plane_state = plane->state;
+	struct drm_plane_state *plane_state = drm_atomic_get_old_plane_state(state, plane);
 	...
 }

@@
identifier plane_atomic_func.func;
identifier plane, state, plane_state;
@@

 func(struct drm_plane *plane, struct drm_atomic_state *state) {
 	struct drm_plane_state *plane_state = drm_atomic_get_old_plane_state(state, plane);
 	...
-	plane->state
+	plane_state
 	...
 }

@ adds_old_state @
identifier plane_atomic_func.func;
identifier plane, state;
@@

 func(struct drm_plane *plane, struct drm_atomic_state *state) {
+	struct drm_plane_state *old_plane_state = drm_atomic_get_old_plane_state(state, plane);
 	...
-	plane->state
+	old_plane_state
 	...
 }

@ include depends on adds_old_state || replaces_old_state @
@@

 #include <drm/drm_atomic.h>

@ no_include depends on !include && (adds_old_state || replaces_old_state) @
@@

+ #include <drm/drm_atomic.h>
  #include <drm/...>

Signed-off-by: Maxime Ripard <maxime@...no.tech>
---
 drivers/gpu/drm/imx/ipuv3-plane.c          | 3 ++-
 drivers/gpu/drm/msm/disp/mdp5/mdp5_plane.c | 4 +++-
 drivers/gpu/drm/tilcdc/tilcdc_plane.c      | 3 ++-
 3 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/imx/ipuv3-plane.c b/drivers/gpu/drm/imx/ipuv3-plane.c
index b5f6123850bb..6484592e3f86 100644
--- a/drivers/gpu/drm/imx/ipuv3-plane.c
+++ b/drivers/gpu/drm/imx/ipuv3-plane.c
@@ -341,7 +341,8 @@ static int ipu_plane_atomic_check(struct drm_plane *plane,
 {
 	struct drm_plane_state *new_state = drm_atomic_get_new_plane_state(state,
 									   plane);
-	struct drm_plane_state *old_state = plane->state;
+	struct drm_plane_state *old_state = drm_atomic_get_old_plane_state(state,
+									   plane);
 	struct drm_crtc_state *crtc_state;
 	struct device *dev = plane->dev->dev;
 	struct drm_framebuffer *fb = new_state->fb;
diff --git a/drivers/gpu/drm/msm/disp/mdp5/mdp5_plane.c b/drivers/gpu/drm/msm/disp/mdp5/mdp5_plane.c
index 4aac6217a5ad..6ce6ce09fecc 100644
--- a/drivers/gpu/drm/msm/disp/mdp5/mdp5_plane.c
+++ b/drivers/gpu/drm/msm/disp/mdp5/mdp5_plane.c
@@ -406,12 +406,14 @@ static int mdp5_plane_atomic_check_with_state(struct drm_crtc_state *crtc_state,
 static int mdp5_plane_atomic_check(struct drm_plane *plane,
 				   struct drm_atomic_state *state)
 {
+	struct drm_plane_state *old_plane_state = drm_atomic_get_old_plane_state(state,
+										 plane);
 	struct drm_plane_state *new_plane_state = drm_atomic_get_new_plane_state(state,
 										 plane);
 	struct drm_crtc *crtc;
 	struct drm_crtc_state *crtc_state;
 
-	crtc = new_plane_state->crtc ? new_plane_state->crtc : plane->state->crtc;
+	crtc = new_plane_state->crtc ? new_plane_state->crtc : old_plane_state->crtc;
 	if (!crtc)
 		return 0;
 
diff --git a/drivers/gpu/drm/tilcdc/tilcdc_plane.c b/drivers/gpu/drm/tilcdc/tilcdc_plane.c
index ebdd42dcaf82..c86258132432 100644
--- a/drivers/gpu/drm/tilcdc/tilcdc_plane.c
+++ b/drivers/gpu/drm/tilcdc/tilcdc_plane.c
@@ -26,7 +26,8 @@ static int tilcdc_plane_atomic_check(struct drm_plane *plane,
 	struct drm_plane_state *new_state = drm_atomic_get_new_plane_state(state,
 									   plane);
 	struct drm_crtc_state *crtc_state;
-	struct drm_plane_state *old_state = plane->state;
+	struct drm_plane_state *old_state = drm_atomic_get_old_plane_state(state,
+									   plane);
 	unsigned int pitch;
 
 	if (!new_state->crtc)
-- 
2.29.2