linux-kernel - [PATCH 5.10 234/452] drm/msm/a6xx: Fix refcount leak in a6xx_gpu

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Message-Id: <20220607164915.533917065@linuxfoundation.org>
Date:   Tue,  7 Jun 2022 19:01:31 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Miaoqian Lin <linmq006@...il.com>,
        Akhil P Oommen <quic_akhilpo@...cinc.com>,
        Rob Clark <robdclark@...omium.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.10 234/452] drm/msm/a6xx: Fix refcount leak in a6xx_gpu_init

From: Miaoqian Lin <linmq006@...il.com>

[ Upstream commit c56de483093d7ad0782327f95dda7da97bc4c315 ]

of_parse_phandle() returns a node pointer with refcount
incremented, we should use of_node_put() on it when not need anymore.

a6xx_gmu_init() passes the node to of_find_device_by_node()
and of_dma_configure(), of_find_device_by_node() will takes its
reference, of_dma_configure() doesn't need the node after usage.

Add missing of_node_put() to avoid refcount leak.

Fixes: 4b565ca5a2cb ("drm/msm: Add A6XX device support")
Signed-off-by: Miaoqian Lin <linmq006@...il.com>
Reviewed-by: Akhil P Oommen <quic_akhilpo@...cinc.com>
Link: https://lore.kernel.org/r/20220512121955.56937-1-linmq006@gmail.com
Signed-off-by: Rob Clark <robdclark@...omium.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/msm/adreno/a6xx_gpu.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
index 39563daff4a0..dffc133b8b1c 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
@@ -1308,6 +1308,7 @@ struct msm_gpu *a6xx_gpu_init(struct drm_device *dev)
 	BUG_ON(!node);
 
 	ret = a6xx_gmu_init(a6xx_gpu, node);
+	of_node_put(node);
 	if (ret) {
 		a6xx_destroy(&(a6xx_gpu->base.base));
 		return ERR_PTR(ret);
-- 
2.35.1