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From:   Sasha Levin <sashal@kernel.org>
To:     linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc:     Nathan Huckleberry <nhuck@google.com>,
        Dan Carpenter <error27@gmail.com>, llvm@lists.linux.dev,
        Inki Dae <inki.dae@samsung.com>,
        Sasha Levin <sashal@kernel.org>, sw0312.kim@samsung.com,
        kyungmin.park@samsung.com, airlied@gmail.com, daniel@ffwll.ch,
        krzysztof.kozlowski@linaro.org, nathan@kernel.org,
        ndesaulniers@google.com, dri-devel@lists.freedesktop.org,
        linux-arm-kernel@lists.infradead.org,
        linux-samsung-soc@vger.kernel.org
Subject: [PATCH AUTOSEL 5.4 12/14] drm/exynos: Fix return type for mixer_mode_valid and hdmi_mode_valid
Date:   Sun,  9 Oct 2022 19:57:08 -0400
Message-Id: <20221009235710.1231937-12-sashal@kernel.org>
In-Reply-To: <20221009235710.1231937-1-sashal@kernel.org>
References: <20221009235710.1231937-1-sashal@kernel.org>
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From: Nathan Huckleberry <nhuck@google.com>

[ Upstream commit 1261255531088208daeca818e2b486030b5339e5 ]

The field mode_valid in exynos_drm_crtc_ops is expected to be of type enum
drm_mode_status (*mode_valid)(struct exynos_drm_crtc *crtc,
                                   const struct drm_display_mode *mode);

Likewise for mode_valid in drm_connector_helper_funcs.

The mismatched return type breaks forward edge kCFI since the underlying
function definition does not match the function hook definition.

The return type of mixer_mode_valid and hdmi_mode_valid should be changed
from int to enum drm_mode_status.

Reported-by: Dan Carpenter <error27@gmail.com>
Link: https://protect2.fireeye.com/v1/url?k=3e644738-5fef521d-3e65cc77-
74fe485cbff6-36ad29bf912d3c9f&q=1&e=5cc06174-77dd-4abd-ab50-
155da5711aa3&u=https%3A%2F%2Fgithub.com%2FClangBuiltLinux%2Flinux%2Fissues%2F
1703
Cc: llvm@lists.linux.dev
Signed-off-by: Nathan Huckleberry <nhuck@google.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/gpu/drm/exynos/exynos_hdmi.c  | 4 ++--
 drivers/gpu/drm/exynos/exynos_mixer.c | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/exynos/exynos_hdmi.c b/drivers/gpu/drm/exynos/exynos_hdmi.c
index 0073a2b3b80a..838a638fb03a 100644
--- a/drivers/gpu/drm/exynos/exynos_hdmi.c
+++ b/drivers/gpu/drm/exynos/exynos_hdmi.c
@@ -911,8 +911,8 @@ static int hdmi_find_phy_conf(struct hdmi_context *hdata, u32 pixel_clock)
 	return -EINVAL;
 }
 
-static int hdmi_mode_valid(struct drm_connector *connector,
-			struct drm_display_mode *mode)
+static enum drm_mode_status hdmi_mode_valid(struct drm_connector *connector,
+					    struct drm_display_mode *mode)
 {
 	struct hdmi_context *hdata = connector_to_hdmi(connector);
 	int ret;
diff --git a/drivers/gpu/drm/exynos/exynos_mixer.c b/drivers/gpu/drm/exynos/exynos_mixer.c
index 22f494145411..07c59e647fc2 100644
--- a/drivers/gpu/drm/exynos/exynos_mixer.c
+++ b/drivers/gpu/drm/exynos/exynos_mixer.c
@@ -1039,7 +1039,7 @@ static void mixer_disable(struct exynos_drm_crtc *crtc)
 	clear_bit(MXR_BIT_POWERED, &ctx->flags);
 }
 
-static int mixer_mode_valid(struct exynos_drm_crtc *crtc,
+static enum drm_mode_status mixer_mode_valid(struct exynos_drm_crtc *crtc,
 		const struct drm_display_mode *mode)
 {
 	struct mixer_context *ctx = crtc->ctx;
-- 
2.35.1