[PATCH AUTOSEL 6.13 31/31] drm/tests: hdmi: Fix recursive locking

Sasha Levin
2025-02-18T20:26:16Z

From: Maxime Ripard <mripard@kernel.org>

[ Upstream commit 5d14c08a47460e8eedf0185a28b116420ea7f29d ]

The find_preferred_mode() functions takes the mode_config mutex, but due
to the order most tests have, is called with the crtc_ww_class_mutex
taken. This raises a warning for a circular dependency when running the
tests with lockdep.

Reorder the tests to call find_preferred_mode before the acquire context
has been created to avoid the issue.

Reviewed-by: Simona Vetter <simona.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20250129-test-kunit-v2-4-fe59c43805d5@kernel.org
Signed-off-by: Maxime Ripard <mripard@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
.../drm/tests/drm_hdmi_state_helper_test.c | 114 +++++++++---------
1 file changed, 57 insertions(+), 57 deletions(-)

diff --git a/drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c b/drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c
index 49a0a5e742921..0bdba1bc585e8 100644
--- a/drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c
+++ b/drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c
@@ -255,12 +255,12 @@ static void drm_test_check_broadcast_rgb_crtc_mode_changed(struct kunit *test)
crtc = priv->crtc;
conn = &priv->connector;

- ctx = drm_kunit_helper_acquire_ctx_alloc(test);
- KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
-
preferred = find_preferred_mode(conn);
KUNIT_ASSERT_NOT_NULL(test, preferred);

+ ctx = drm_kunit_helper_acquire_ctx_alloc(test);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
+
ret = light_up_connector(test, drm, crtc, conn, preferred, ctx);
KUNIT_ASSERT_EQ(test, ret, 0);

@@ -319,12 +319,12 @@ static void drm_test_check_broadcast_rgb_crtc_mode_not_changed(struct kunit *tes
crtc = priv->crtc;
conn = &priv->connector;

- ctx = drm_kunit_helper_acquire_ctx_alloc(test);
- KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
-
preferred = find_preferred_mode(conn);
KUNIT_ASSERT_NOT_NULL(test, preferred);

+ ctx = drm_kunit_helper_acquire_ctx_alloc(test);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
+
ret = light_up_connector(test, drm, crtc, conn, preferred, ctx);
KUNIT_ASSERT_EQ(test, ret, 0);

@@ -384,13 +384,13 @@ static void drm_test_check_broadcast_rgb_auto_cea_mode(struct kunit *test)
conn = &priv->connector;
KUNIT_ASSERT_TRUE(test, conn->display_info.is_hdmi);

- ctx = drm_kunit_helper_acquire_ctx_alloc(test);
- KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
-
preferred = find_preferred_mode(conn);
KUNIT_ASSERT_NOT_NULL(test, preferred);
KUNIT_ASSERT_NE(test, drm_match_cea_mode(preferred), 1);

+ ctx = drm_kunit_helper_acquire_ctx_alloc(test);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
+
ret = light_up_connector(test, drm, crtc, conn, preferred, ctx);
KUNIT_ASSERT_EQ(test, ret, 0);

@@ -495,13 +495,13 @@ static void drm_test_check_broadcast_rgb_full_cea_mode(struct kunit *test)
conn = &priv->connector;
KUNIT_ASSERT_TRUE(test, conn->display_info.is_hdmi);

- ctx = drm_kunit_helper_acquire_ctx_alloc(test);
- KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
-
preferred = find_preferred_mode(conn);
KUNIT_ASSERT_NOT_NULL(test, preferred);
KUNIT_ASSERT_NE(test, drm_match_cea_mode(preferred), 1);

+ ctx = drm_kunit_helper_acquire_ctx_alloc(test);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
+
ret = light_up_connector(test, drm, crtc, conn, preferred, ctx);
KUNIT_ASSERT_EQ(test, ret, 0);

@@ -610,13 +610,13 @@ static void drm_test_check_broadcast_rgb_limited_cea_mode(struct kunit *test)
conn = &priv->connector;
KUNIT_ASSERT_TRUE(test, conn->display_info.is_hdmi);

- ctx = drm_kunit_helper_acquire_ctx_alloc(test);
- KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
-
preferred = find_preferred_mode(conn);
KUNIT_ASSERT_NOT_NULL(test, preferred);
KUNIT_ASSERT_NE(test, drm_match_cea_mode(preferred), 1);

+ ctx = drm_kunit_helper_acquire_ctx_alloc(test);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
+
ret = light_up_connector(test, drm, crtc, conn, preferred, ctx);
KUNIT_ASSERT_EQ(test, ret, 0);

@@ -730,12 +730,12 @@ static void drm_test_check_output_bpc_crtc_mode_changed(struct kunit *test)
ARRAY_SIZE(test_edid_hdmi_1080p_rgb_yuv_dc_max_200mhz));
KUNIT_ASSERT_GT(test, ret, 0);

- ctx = drm_kunit_helper_acquire_ctx_alloc(test);
- KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
-
preferred = find_preferred_mode(conn);
KUNIT_ASSERT_NOT_NULL(test, preferred);

+ ctx = drm_kunit_helper_acquire_ctx_alloc(test);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
+
ret = light_up_connector(test, drm, crtc, conn, preferred, ctx);
KUNIT_ASSERT_EQ(test, ret, 0);

@@ -804,12 +804,12 @@ static void drm_test_check_output_bpc_crtc_mode_not_changed(struct kunit *test)
ARRAY_SIZE(test_edid_hdmi_1080p_rgb_yuv_dc_max_200mhz));
KUNIT_ASSERT_GT(test, ret, 0);

- ctx = drm_kunit_helper_acquire_ctx_alloc(test);
- KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
-
preferred = find_preferred_mode(conn);
KUNIT_ASSERT_NOT_NULL(test, preferred);

+ ctx = drm_kunit_helper_acquire_ctx_alloc(test);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
+
ret = light_up_connector(test, drm, crtc, conn, preferred, ctx);
KUNIT_ASSERT_EQ(test, ret, 0);

@@ -878,12 +878,12 @@ static void drm_test_check_output_bpc_dvi(struct kunit *test)
info = &conn->display_info;
KUNIT_ASSERT_FALSE(test, info->is_hdmi);

- ctx = drm_kunit_helper_acquire_ctx_alloc(test);
- KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
-
preferred = find_preferred_mode(conn);
KUNIT_ASSERT_NOT_NULL(test, preferred);

+ ctx = drm_kunit_helper_acquire_ctx_alloc(test);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
+
ret = light_up_connector(test, drm, crtc, conn, preferred, ctx);
KUNIT_ASSERT_EQ(test, ret, 0);

@@ -922,13 +922,13 @@ static void drm_test_check_tmds_char_rate_rgb_8bpc(struct kunit *test)
ARRAY_SIZE(test_edid_hdmi_1080p_rgb_max_200mhz));
KUNIT_ASSERT_GT(test, ret, 0);

- ctx = drm_kunit_helper_acquire_ctx_alloc(test);
- KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
-
preferred = find_preferred_mode(conn);
KUNIT_ASSERT_NOT_NULL(test, preferred);
KUNIT_ASSERT_FALSE(test, preferred->flags & DRM_MODE_FLAG_DBLCLK);

+ ctx = drm_kunit_helper_acquire_ctx_alloc(test);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
+
ret = light_up_connector(test, drm, crtc, conn, preferred, ctx);
KUNIT_ASSERT_EQ(test, ret, 0);

@@ -969,13 +969,13 @@ static void drm_test_check_tmds_char_rate_rgb_10bpc(struct kunit *test)
ARRAY_SIZE(test_edid_hdmi_1080p_rgb_yuv_dc_max_340mhz));
KUNIT_ASSERT_GT(test, ret, 0);

- ctx = drm_kunit_helper_acquire_ctx_alloc(test);
- KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
-
preferred = find_preferred_mode(conn);
KUNIT_ASSERT_NOT_NULL(test, preferred);
KUNIT_ASSERT_FALSE(test, preferred->flags & DRM_MODE_FLAG_DBLCLK);

+ ctx = drm_kunit_helper_acquire_ctx_alloc(test);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
+
ret = light_up_connector(test, drm, crtc, conn, preferred, ctx);
KUNIT_ASSERT_EQ(test, ret, 0);

@@ -1016,13 +1016,13 @@ static void drm_test_check_tmds_char_rate_rgb_12bpc(struct kunit *test)
ARRAY_SIZE(test_edid_hdmi_1080p_rgb_yuv_dc_max_340mhz));
KUNIT_ASSERT_GT(test, ret, 0);

- ctx = drm_kunit_helper_acquire_ctx_alloc(test);
- KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
-
preferred = find_preferred_mode(conn);
KUNIT_ASSERT_NOT_NULL(test, preferred);
KUNIT_ASSERT_FALSE(test, preferred->flags & DRM_MODE_FLAG_DBLCLK);

+ ctx = drm_kunit_helper_acquire_ctx_alloc(test);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
+
ret = light_up_connector(test, drm, crtc, conn, preferred, ctx);
KUNIT_ASSERT_EQ(test, ret, 0);

@@ -1063,12 +1063,12 @@ static void drm_test_check_hdmi_funcs_reject_rate(struct kunit *test)
crtc = priv->crtc;
conn = &priv->connector;

- ctx = drm_kunit_helper_acquire_ctx_alloc(test);
- KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
-
preferred = find_preferred_mode(conn);
KUNIT_ASSERT_NOT_NULL(test, preferred);

+ ctx = drm_kunit_helper_acquire_ctx_alloc(test);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
+
ret = light_up_connector(test, drm, crtc, conn, preferred, ctx);
KUNIT_ASSERT_EQ(test, ret, 0);

@@ -1128,9 +1128,6 @@ static void drm_test_check_max_tmds_rate_bpc_fallback(struct kunit *test)
KUNIT_ASSERT_TRUE(test, info->is_hdmi);
KUNIT_ASSERT_GT(test, info->max_tmds_clock, 0);

- ctx = drm_kunit_helper_acquire_ctx_alloc(test);
- KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
-
preferred = find_preferred_mode(conn);
KUNIT_ASSERT_NOT_NULL(test, preferred);
KUNIT_ASSERT_FALSE(test, preferred->flags & DRM_MODE_FLAG_DBLCLK);
@@ -1141,6 +1138,9 @@ static void drm_test_check_max_tmds_rate_bpc_fallback(struct kunit *test)
rate = drm_hdmi_compute_mode_clock(preferred, 10, HDMI_COLORSPACE_RGB);
KUNIT_ASSERT_LT(test, rate, info->max_tmds_clock * 1000);

+ ctx = drm_kunit_helper_acquire_ctx_alloc(test);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
+
ret = light_up_connector(test, drm, crtc, conn, preferred, ctx);
KUNIT_EXPECT_EQ(test, ret, 0);

@@ -1197,9 +1197,6 @@ static void drm_test_check_max_tmds_rate_format_fallback(struct kunit *test)
KUNIT_ASSERT_TRUE(test, info->is_hdmi);
KUNIT_ASSERT_GT(test, info->max_tmds_clock, 0);

- ctx = drm_kunit_helper_acquire_ctx_alloc(test);
- KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
-
preferred = find_preferred_mode(conn);
KUNIT_ASSERT_NOT_NULL(test, preferred);
KUNIT_ASSERT_FALSE(test, preferred->flags & DRM_MODE_FLAG_DBLCLK);
@@ -1213,6 +1210,9 @@ static void drm_test_check_max_tmds_rate_format_fallback(struct kunit *test)
rate = drm_hdmi_compute_mode_clock(preferred, 12, HDMI_COLORSPACE_YUV422);
KUNIT_ASSERT_LT(test, rate, info->max_tmds_clock * 1000);

+ ctx = drm_kunit_helper_acquire_ctx_alloc(test);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
+
ret = light_up_connector(test, drm, crtc, conn, preferred, ctx);
KUNIT_EXPECT_EQ(test, ret, 0);

@@ -1259,9 +1259,6 @@ static void drm_test_check_output_bpc_format_vic_1(struct kunit *test)
KUNIT_ASSERT_TRUE(test, info->is_hdmi);
KUNIT_ASSERT_GT(test, info->max_tmds_clock, 0);

- ctx = drm_kunit_helper_acquire_ctx_alloc(test);
- KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
-
mode = drm_kunit_display_mode_from_cea_vic(test, drm, 1);
KUNIT_ASSERT_NOT_NULL(test, mode);

@@ -1275,6 +1272,9 @@ static void drm_test_check_output_bpc_format_vic_1(struct kunit *test)
rate = mode->clock * 1500;
KUNIT_ASSERT_LT(test, rate, info->max_tmds_clock * 1000);

+ ctx = drm_kunit_helper_acquire_ctx_alloc(test);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
+
crtc = priv->crtc;
ret = light_up_connector(test, drm, crtc, conn, mode, ctx);
KUNIT_EXPECT_EQ(test, ret, 0);
@@ -1320,9 +1320,6 @@ static void drm_test_check_output_bpc_format_driver_rgb_only(struct kunit *test)
KUNIT_ASSERT_TRUE(test, info->is_hdmi);
KUNIT_ASSERT_GT(test, info->max_tmds_clock, 0);

- ctx = drm_kunit_helper_acquire_ctx_alloc(test);
- KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
-
preferred = find_preferred_mode(conn);
KUNIT_ASSERT_NOT_NULL(test, preferred);

@@ -1341,6 +1338,9 @@ static void drm_test_check_output_bpc_format_driver_rgb_only(struct kunit *test)
rate = drm_hdmi_compute_mode_clock(preferred, 12, HDMI_COLORSPACE_YUV422);
KUNIT_ASSERT_LT(test, rate, info->max_tmds_clock * 1000);

+ ctx = drm_kunit_helper_acquire_ctx_alloc(test);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
+
ret = light_up_connector(test, drm, crtc, conn, preferred, ctx);
KUNIT_EXPECT_EQ(test, ret, 0);

@@ -1387,9 +1387,6 @@ static void drm_test_check_output_bpc_format_display_rgb_only(struct kunit *test
KUNIT_ASSERT_TRUE(test, info->is_hdmi);
KUNIT_ASSERT_GT(test, info->max_tmds_clock, 0);

- ctx = drm_kunit_helper_acquire_ctx_alloc(test);
- KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
-
preferred = find_preferred_mode(conn);
KUNIT_ASSERT_NOT_NULL(test, preferred);

@@ -1408,6 +1405,9 @@ static void drm_test_check_output_bpc_format_display_rgb_only(struct kunit *test
rate = drm_hdmi_compute_mode_clock(preferred, 12, HDMI_COLORSPACE_YUV422);
KUNIT_ASSERT_LT(test, rate, info->max_tmds_clock * 1000);

+ ctx = drm_kunit_helper_acquire_ctx_alloc(test);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
+
ret = light_up_connector(test, drm, crtc, conn, preferred, ctx);
KUNIT_EXPECT_EQ(test, ret, 0);

@@ -1453,9 +1453,6 @@ static void drm_test_check_output_bpc_format_driver_8bpc_only(struct kunit *test
KUNIT_ASSERT_TRUE(test, info->is_hdmi);
KUNIT_ASSERT_GT(test, info->max_tmds_clock, 0);

- ctx = drm_kunit_helper_acquire_ctx_alloc(test);
- KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
-
preferred = find_preferred_mode(conn);
KUNIT_ASSERT_NOT_NULL(test, preferred);

@@ -1466,6 +1463,9 @@ static void drm_test_check_output_bpc_format_driver_8bpc_only(struct kunit *test
rate = drm_hdmi_compute_mode_clock(preferred, 12, HDMI_COLORSPACE_RGB);
KUNIT_ASSERT_LT(test, rate, info->max_tmds_clock * 1000);

+ ctx = drm_kunit_helper_acquire_ctx_alloc(test);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
+
ret = light_up_connector(test, drm, crtc, conn, preferred, ctx);
KUNIT_EXPECT_EQ(test, ret, 0);

@@ -1513,9 +1513,6 @@ static void drm_test_check_output_bpc_format_display_8bpc_only(struct kunit *tes
KUNIT_ASSERT_TRUE(test, info->is_hdmi);
KUNIT_ASSERT_GT(test, info->max_tmds_clock, 0);

- ctx = drm_kunit_helper_acquire_ctx_alloc(test);
- KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
-
preferred = find_preferred_mode(conn);
KUNIT_ASSERT_NOT_NULL(test, preferred);

@@ -1526,6 +1523,9 @@ static void drm_test_check_output_bpc_format_display_8bpc_only(struct kunit *tes
rate = drm_hdmi_compute_mode_clock(preferred, 12, HDMI_COLORSPACE_RGB);
KUNIT_ASSERT_LT(test, rate, info->max_tmds_clock * 1000);

+ ctx = drm_kunit_helper_acquire_ctx_alloc(test);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
+
ret = light_up_connector(test, drm, crtc, conn, preferred, ctx);
KUNIT_EXPECT_EQ(test, ret, 0);

--
2.39.5