linux-kernel - FAILED: Patch "drm/amd/display: Init link enc resources in dc_state only if res_pool presents" failed to apply to 4.19-stable tree

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Message-ID: <20240327122603.2840778-1-sashal@kernel.org>
Date: Wed, 27 Mar 2024 08:26:02 -0400
From: Sasha Levin <sashal@...nel.org>
To: stable@...r.kernel.org,
	dillon.varone@....com
Cc: Mario Limonciello <mario.limonciello@....com>,
	Alex Deucher <alexander.deucher@....com>,
	Martin Leung <martin.leung@....com>,
	Alex Hung <alex.hung@....com>,
	Daniel Wheeler <daniel.wheeler@....com>,
	amd-gfx@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Subject: FAILED: Patch "drm/amd/display: Init link enc resources in dc_state only if res_pool presents" 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 ca25a2b5f841f991e472e2dde7f5e2d337dbea08 Mon Sep 17 00:00:00 2001
From: Dillon Varone <dillon.varone@....com>
Date: Thu, 28 Dec 2023 21:36:39 -0500
Subject: [PATCH] drm/amd/display: Init link enc resources in dc_state only if
 res_pool presents

[Why & How]
res_pool is not initialized in all situations such as virtual
environments, and therefore link encoder resources should not be
initialized if res_pool is NULL.

Cc: Mario Limonciello <mario.limonciello@....com>
Cc: Alex Deucher <alexander.deucher@....com>
Cc: stable@...r.kernel.org
Reviewed-by: Martin Leung <martin.leung@....com>
Acked-by: Alex Hung <alex.hung@....com>
Signed-off-by: Dillon Varone <dillon.varone@....com>
Tested-by: Daniel Wheeler <daniel.wheeler@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
---
 drivers/gpu/drm/amd/display/dc/core/dc_state.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_state.c b/drivers/gpu/drm/amd/display/dc/core/dc_state.c
index 460a8010c79fe..56feee0ff01b1 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_state.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_state.c
@@ -267,7 +267,8 @@ void dc_state_construct(struct dc *dc, struct dc_state *state)
 	state->clk_mgr = dc->clk_mgr;
 
 	/* Initialise DIG link encoder resource tracking variables. */
-	link_enc_cfg_init(dc, state);
+	if (dc->res_pool)
+		link_enc_cfg_init(dc, state);
 }
 
 void dc_state_destruct(struct dc_state *state)
-- 
2.43.0