linux-kernel - [PATCH AUTOSEL 6.6 19/83] drm/amd/display: Skip inactive planes within ModeSupportAndSystemConfiguration

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Message-ID: <20240801002107.3934037-19-sashal@kernel.org>
Date: Wed, 31 Jul 2024 20:17:34 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Hersen Wu <hersenxs.wu@....com>,
	Alex Hung <alex.hung@....com>,
	Tom Chung <chiahsuan.chung@....com>,
	Daniel Wheeler <daniel.wheeler@....com>,
	Alex Deucher <alexander.deucher@....com>,
	Sasha Levin <sashal@...nel.org>,
	harry.wentland@....com,
	sunpeng.li@....com,
	Rodrigo.Siqueira@....com,
	christian.koenig@....com,
	Xinhui.Pan@....com,
	airlied@...il.com,
	daniel@...ll.ch,
	amd-gfx@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 6.6 19/83] drm/amd/display: Skip inactive planes within ModeSupportAndSystemConfiguration

From: Hersen Wu <hersenxs.wu@....com>

[ Upstream commit a54f7e866cc73a4cb71b8b24bb568ba35c8969df ]

[Why]
Coverity reports Memory - illegal accesses.

[How]
Skip inactive planes.

Reviewed-by: Alex Hung <alex.hung@....com>
Acked-by: Tom Chung <chiahsuan.chung@....com>
Signed-off-by: Hersen Wu <hersenxs.wu@....com>
Tested-by: Daniel Wheeler <daniel.wheeler@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/amd/display/dc/dml/display_mode_vba.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dml/display_mode_vba.c b/drivers/gpu/drm/amd/display/dc/dml/display_mode_vba.c
index 9a3ded3111952..85453bbb4f9b1 100644
--- a/drivers/gpu/drm/amd/display/dc/dml/display_mode_vba.c
+++ b/drivers/gpu/drm/amd/display/dc/dml/display_mode_vba.c
@@ -1099,8 +1099,13 @@ void ModeSupportAndSystemConfiguration(struct display_mode_lib *mode_lib)
 
 	// Total Available Pipes Support Check
 	for (k = 0; k < mode_lib->vba.NumberOfActivePlanes; ++k) {
-		total_pipes += mode_lib->vba.DPPPerPlane[k];
 		pipe_idx = get_pipe_idx(mode_lib, k);
+		if (pipe_idx == -1) {
+			ASSERT(0);
+			continue; // skip inactive planes
+		}
+		total_pipes += mode_lib->vba.DPPPerPlane[k];
+
 		if (mode_lib->vba.cache_pipes[pipe_idx].clks_cfg.dppclk_mhz > 0.0)
 			mode_lib->vba.DPPCLK[k] = mode_lib->vba.cache_pipes[pipe_idx].clks_cfg.dppclk_mhz;
 		else
-- 
2.43.0