linux-kernel - FAILED: Patch "drm/amd/display: Fix late derefrence 'dsc' check in 'link_set_dsc_pps_packet()'" failed to apply to 4.19-stable tree

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Date: Wed, 27 Mar 2024 08:26:45 -0400
From: Sasha Levin <sashal@...nel.org>
To: stable@...r.kernel.org,
	srinivasan.shanmugam@....com
Cc: Aurabindo Pillai <aurabindo.pillai@....com>,
	Rodrigo Siqueira <Rodrigo.Siqueira@....com>,
	Hamza Mahfooz <hamza.mahfooz@....com>,
	Wenjing Liu <wenjing.liu@....com>,
	Qingqing Zhuo <qingqing.zhuo@....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 late derefrence 'dsc' check in 'link_set_dsc_pps_packet()'" 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 166225e79ccc3d02c4c46e1b3c09d03eb91473ca Mon Sep 17 00:00:00 2001
From: Srinivasan Shanmugam <srinivasan.shanmugam@....com>
Date: Wed, 10 Jan 2024 20:58:35 +0530
Subject: [PATCH] drm/amd/display: Fix late derefrence 'dsc' check in
 'link_set_dsc_pps_packet()'

In link_set_dsc_pps_packet(), 'struct display_stream_compressor *dsc'
was dereferenced in a DC_LOGGER_INIT(dsc->ctx->logger); before the 'dsc'
NULL pointer check.

Fixes the below:
drivers/gpu/drm/amd/amdgpu/../display/dc/link/link_dpms.c:905 link_set_dsc_pps_packet() warn: variable dereferenced before check 'dsc' (see line 903)

Cc: stable@...r.kernel.org
Cc: Aurabindo Pillai <aurabindo.pillai@....com>
Cc: Rodrigo Siqueira <Rodrigo.Siqueira@....com>
Cc: Hamza Mahfooz <hamza.mahfooz@....com>
Cc: Wenjing Liu <wenjing.liu@....com>
Cc: Qingqing Zhuo <qingqing.zhuo@....com>
Signed-off-by: Srinivasan Shanmugam <srinivasan.shanmugam@....com>
Reviewed-by: Aurabindo Pillai <aurabindo.pillai@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
---
 drivers/gpu/drm/amd/display/dc/link/link_dpms.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/link/link_dpms.c b/drivers/gpu/drm/amd/display/dc/link/link_dpms.c
index 3de148004c066..3cbfbf8d107e9 100644
--- a/drivers/gpu/drm/amd/display/dc/link/link_dpms.c
+++ b/drivers/gpu/drm/amd/display/dc/link/link_dpms.c
@@ -900,11 +900,15 @@ bool link_set_dsc_pps_packet(struct pipe_ctx *pipe_ctx, bool enable, bool immedi
 {
 	struct display_stream_compressor *dsc = pipe_ctx->stream_res.dsc;
 	struct dc_stream_state *stream = pipe_ctx->stream;
-	DC_LOGGER_INIT(dsc->ctx->logger);
 
-	if (!pipe_ctx->stream->timing.flags.DSC || !dsc)
+	if (!pipe_ctx->stream->timing.flags.DSC)
 		return false;
 
+	if (!dsc)
+		return false;
+
+	DC_LOGGER_INIT(dsc->ctx->logger);
+
 	if (enable) {
 		struct dsc_config dsc_cfg;
 		uint8_t dsc_packed_pps[128];
-- 
2.43.0