linux-kernel - [PATCH 5.19 0800/1157] of: device: Fix missing of_node_put() in of_dma_set_restricted

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Message-Id: <20220815180511.486332585@linuxfoundation.org>
Date:   Mon, 15 Aug 2022 20:02:36 +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, Liang He <windhl@....com>,
        Rob Herring <robh@...nel.org>, Sasha Levin <sashal@...nel.org>,
        Miaoqian Lin <linmq006@...il.com>
Subject: [PATCH 5.19 0800/1157] of: device: Fix missing of_node_put() in of_dma_set_restricted_buffer

From: Liang He <windhl@....com>

[ Upstream commit d17e37c41b7ed38459957a5d2968ba61516fd5c2 ]

We should use of_node_put() for the reference 'node' returned by
of_parse_phandle() which will increase the refcount.

Fixes: fec9b625095f ("of: Add plumbing for restricted DMA pool")
Co-authored-by: Miaoqian Lin <linmq006@...il.com>
Signed-off-by: Liang He <windhl@....com>
Signed-off-by: Rob Herring <robh@...nel.org>
Link: https://lore.kernel.org/r/20220702014449.263772-1-windhl@126.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/of/device.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/of/device.c b/drivers/of/device.c
index 874f031442dc..75b6cbffa755 100644
--- a/drivers/of/device.c
+++ b/drivers/of/device.c
@@ -81,8 +81,11 @@ of_dma_set_restricted_buffer(struct device *dev, struct device_node *np)
 		 * restricted-dma-pool region is allowed.
 		 */
 		if (of_device_is_compatible(node, "restricted-dma-pool") &&
-		    of_device_is_available(node))
+		    of_device_is_available(node)) {
+			of_node_put(node);
 			break;
+		}
+		of_node_put(node);
 	}
 
 	/*
-- 
2.35.1