linux-kernel - [PATCH 1/6] drm/exynos: exynos7_drm_decon: fix uninitialized crtc reference in functions

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Message-Id: <20240919-exynosdrm-decon-v1-1-6c5861c1cb04@disroot.org>
Date: Thu, 19 Sep 2024 20:41:00 +0530
From: Kaustabh Chakraborty <kauschluss@...root.org>
To: Inki Dae <inki.dae@...sung.com>, Seung-Woo Kim <sw0312.kim@...sung.com>, 
 Kyungmin Park <kyungmin.park@...sung.com>, David Airlie <airlied@...il.com>, 
 Simona Vetter <simona@...ll.ch>, Krzysztof Kozlowski <krzk@...nel.org>, 
 Alim Akhtar <alim.akhtar@...sung.com>, 
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
 Rob Herring <robh@...nel.org>, Conor Dooley <conor@...nel.org>
Cc: dri-devel@...ts.freedesktop.org, linux-arm-kernel@...ts.infradead.org, 
 linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org, 
 devicetree@...r.kernel.org, Kaustabh Chakraborty <kauschluss@...root.org>
Subject: [PATCH 1/6] drm/exynos: exynos7_drm_decon: fix uninitialized crtc
 reference in functions

decon_clear_channels() and decon_wait_for_vblank() accept a pointer to
struct exynos_drm_crtc. However, these functions are called when the
crtc is still uninitialized. Moreover, both functions use the pointer to
retrieve and use struct decon_context, which is initialized.

Modify the functions to accept a pointer to struct decon_context
instead.

Signed-off-by: Kaustabh Chakraborty <kauschluss@...root.org>
---
 drivers/gpu/drm/exynos/exynos7_drm_decon.c | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/exynos/exynos7_drm_decon.c b/drivers/gpu/drm/exynos/exynos7_drm_decon.c
index 0d185c0564b9..e994779694f0 100644
--- a/drivers/gpu/drm/exynos/exynos7_drm_decon.c
+++ b/drivers/gpu/drm/exynos/exynos7_drm_decon.c
@@ -81,10 +81,8 @@ static const enum drm_plane_type decon_win_types[WINDOWS_NR] = {
 	DRM_PLANE_TYPE_CURSOR,
 };
 
-static void decon_wait_for_vblank(struct exynos_drm_crtc *crtc)
+static void decon_wait_for_vblank(struct decon_context *ctx)
 {
-	struct decon_context *ctx = crtc->ctx;
-
 	if (ctx->suspended)
 		return;
 
@@ -100,9 +98,8 @@ static void decon_wait_for_vblank(struct exynos_drm_crtc *crtc)
 		DRM_DEV_DEBUG_KMS(ctx->dev, "vblank wait timed out.\n");
 }
 
-static void decon_clear_channels(struct exynos_drm_crtc *crtc)
+static void decon_clear_channels(struct decon_context *ctx)
 {
-	struct decon_context *ctx = crtc->ctx;
 	unsigned int win, ch_enabled = 0;
 
 	/* Check if any channel is enabled. */
@@ -118,7 +115,7 @@ static void decon_clear_channels(struct exynos_drm_crtc *crtc)
 
 	/* Wait for vsync, as disable channel takes effect at next vsync */
 	if (ch_enabled)
-		decon_wait_for_vblank(ctx->crtc);
+		decon_wait_for_vblank(ctx);
 }
 
 static int decon_ctx_initialize(struct decon_context *ctx,
@@ -126,7 +123,7 @@ static int decon_ctx_initialize(struct decon_context *ctx,
 {
 	ctx->drm_dev = drm_dev;
 
-	decon_clear_channels(ctx->crtc);
+	decon_clear_channels(ctx);
 
 	return exynos_drm_register_dma(drm_dev, ctx->dev, &ctx->dma_priv);
 }

-- 
2.46.1