FAILED: patch "[PATCH] drm/amd/display: fix double memory allocation" failed to apply to 6.1-stable tree

[<gregkh@linuxfoundation.org>]

The patch below does not apply to the 6.1-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@vger.kernel.org>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.1.y
git checkout FETCH_HEAD
git cherry-pick -x f5442b35e69e42015ef3082008c0d85cdcc0ca05
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2023051313-petroleum-strobe-9700@gregkh' --subject-prefix 'PATCH 6.1.y' HEAD^..

Possible dependencies:

f5442b35e69e ("drm/amd/display: fix double memory allocation")
b5006f873b99 ("drm/amd/display: initialize link_srv in virtual env")

thanks,

greg k-h

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

From f5442b35e69e42015ef3082008c0d85cdcc0ca05 Mon Sep 17 00:00:00 2001
From: Martin Leung <Martin.Leung@amd.com>
Date: Tue, 14 Mar 2023 09:27:20 -0400
Subject: [PATCH] drm/amd/display: fix double memory allocation

[Why & How]
when trying to fix a nullptr dereference on VMs,
accidentally doubly allocated memory for the non VM
case. removed the extra link_srv creation since
dc_construct_ctx is called in both VM and non VM cases
Also added a proper fail check for if kzalloc fails

Cc: stable@vger.kernel.org
Cc: Mario Limonciello <mario.limonciello@amd.com>
Reviewed-by: Leo Ma <Hanghong.Ma@amd.com>
Acked-by: Qingqing Zhuo <qingqing.zhuo@amd.com>
Signed-off-by: Martin Leung <Martin.Leung@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c b/drivers/gpu/drm/amd/display/dc/core/dc.c
index 40f2e174c524..52564b93f7eb 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
@@ -887,7 +887,10 @@ static bool dc_construct_ctx(struct dc *dc,
 	}
 
 	dc->ctx = dc_ctx;
+
 	dc->link_srv = link_create_link_service();
+	if (!dc->link_srv)
+		return false;
 
 	return true;
 }
@@ -986,8 +989,6 @@ static bool dc_construct(struct dc *dc,
 		goto fail;
 	}
 
-	dc->link_srv = link_create_link_service();
-
 	dc->res_pool = dc_create_resource_pool(dc, init_params, dc_ctx->dce_version);
 	if (!dc->res_pool)
 		goto fail;