linux-kernel - FAILED: Patch "drm/amd/display: Fix uninitialized variable usage in core_link_ 'read_dpcd() & write_dpcd()' functions" failed to apply to 4.19-stable tree

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Message-ID: <20240327122632.2841187-1-sashal@kernel.org>
Date: Wed, 27 Mar 2024 08:26:32 -0400
From: Sasha Levin <sashal@...nel.org>
To: stable@...r.kernel.org,
	srinivasan.shanmugam@....com
Cc: Jerry Zuo <jerry.zuo@....com>,
	Jun Lei <Jun.Lei@....com>,
	Wayne Lin <Wayne.Lin@....com>,
	Aurabindo Pillai <aurabindo.pillai@....com>,
	Rodrigo Siqueira <Rodrigo.Siqueira@....com>,
	Hamza Mahfooz <hamza.mahfooz@....com>,
	Alex Deucher <alexander.deucher@....com>,
	amd-gfx@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Subject: FAILED: Patch "drm/amd/display: Fix uninitialized variable usage in core_link_ 'read_dpcd() & write_dpcd()' functions" failed to apply to 4.19-stable tree

The patch below does not apply to the 4.19-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@...r.kernel.org>.

Thanks,
Sasha

------------------ original commit in Linus's tree ------------------

>From 3295580d4683bdc56c0662b4a4834f597baceadc Mon Sep 17 00:00:00 2001
From: Srinivasan Shanmugam <srinivasan.shanmugam@....com>
Date: Wed, 17 Jan 2024 08:41:52 +0530
Subject: [PATCH] drm/amd/display: Fix uninitialized variable usage in
 core_link_ 'read_dpcd() & write_dpcd()' functions

The 'status' variable in 'core_link_read_dpcd()' &
'core_link_write_dpcd()' was uninitialized.

Thus, initializing 'status' variable to 'DC_ERROR_UNEXPECTED' by default.

Fixes the below:
drivers/gpu/drm/amd/amdgpu/../display/dc/link/protocols/link_dpcd.c:226 core_link_read_dpcd() error: uninitialized symbol 'status'.
drivers/gpu/drm/amd/amdgpu/../display/dc/link/protocols/link_dpcd.c:248 core_link_write_dpcd() error: uninitialized symbol 'status'.

Cc: stable@...r.kernel.org
Cc: Jerry Zuo <jerry.zuo@....com>
Cc: Jun Lei <Jun.Lei@....com>
Cc: Wayne Lin <Wayne.Lin@....com>
Cc: Aurabindo Pillai <aurabindo.pillai@....com>
Cc: Rodrigo Siqueira <Rodrigo.Siqueira@....com>
Cc: Hamza Mahfooz <hamza.mahfooz@....com>
Signed-off-by: Srinivasan Shanmugam <srinivasan.shanmugam@....com>
Reviewed-by: Rodrigo Siqueira <Rodrigo.Siqueira@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
---
 drivers/gpu/drm/amd/display/dc/link/protocols/link_dpcd.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dpcd.c b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dpcd.c
index 5c9a30211c109..fc50931c2aecb 100644
--- a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dpcd.c
+++ b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dpcd.c
@@ -205,7 +205,7 @@ enum dc_status core_link_read_dpcd(
 	uint32_t extended_size;
 	/* size of the remaining partitioned address space */
 	uint32_t size_left_to_read;
-	enum dc_status status;
+	enum dc_status status = DC_ERROR_UNEXPECTED;
 	/* size of the next partition to be read from */
 	uint32_t partition_size;
 	uint32_t data_index = 0;
@@ -234,7 +234,7 @@ enum dc_status core_link_write_dpcd(
 {
 	uint32_t partition_size;
 	uint32_t data_index = 0;
-	enum dc_status status;
+	enum dc_status status = DC_ERROR_UNEXPECTED;
 
 	while (size) {
 		partition_size = dpcd_get_next_partition_size(address, size);
-- 
2.43.0