FAILED: patch "[PATCH] drm/mediatek: Fix probe device leaks" failed to apply to 5.15-stable tree

[<gregkh@linuxfoundation.org>]

The patch below does not apply to the 5.15-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-5.15.y
git checkout FETCH_HEAD
git cherry-pick -x 2a2a04be8e869a19c9f950b89b1e05832a0f7ec7
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2026010536-dotted-gratify-58a1@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^..

Possible dependencies:



thanks,

greg k-h

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

From 2a2a04be8e869a19c9f950b89b1e05832a0f7ec7 Mon Sep 17 00:00:00 2001
From: Johan Hovold <johan@kernel.org>
Date: Tue, 23 Sep 2025 17:23:38 +0200
Subject: [PATCH] drm/mediatek: Fix probe device leaks

Make sure to drop the reference taken to each component device during
probe on probe failure (e.g. probe deferral) and on driver unbind.

Fixes: 6ea6f8276725 ("drm/mediatek: Use correct device pointer to get CMDQ client register")
Cc: stable@vger.kernel.org	# 5.12
Cc: Chun-Kuang Hu <chunkuang.hu@kernel.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://patchwork.kernel.org/project/dri-devel/patch/20250923152340.18234-4-johan@kernel.org/
Signed-off-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>

diff --git a/drivers/gpu/drm/mediatek/mtk_ddp_comp.c b/drivers/gpu/drm/mediatek/mtk_ddp_comp.c
index 31d67a131c50..9672ea1f91a2 100644
--- a/drivers/gpu/drm/mediatek/mtk_ddp_comp.c
+++ b/drivers/gpu/drm/mediatek/mtk_ddp_comp.c
@@ -621,6 +621,13 @@ int mtk_find_possible_crtcs(struct drm_device *drm, struct device *dev)
 	return ret;
 }
 
+static void mtk_ddp_comp_put_device(void *_dev)
+{
+	struct device *dev = _dev;
+
+	put_device(dev);
+}
+
 static void mtk_ddp_comp_clk_put(void *_clk)
 {
 	struct clk *clk = _clk;
@@ -656,6 +663,10 @@ int mtk_ddp_comp_init(struct device *dev, struct device_node *node, struct mtk_d
 	}
 	comp->dev = &comp_pdev->dev;
 
+	ret = devm_add_action_or_reset(dev, mtk_ddp_comp_put_device, comp->dev);
+	if (ret)
+		return ret;
+
 	if (type == MTK_DISP_AAL ||
 	    type == MTK_DISP_BLS ||
 	    type == MTK_DISP_CCORR ||