linux-kernel - [PATCH 4/4] nvmem: core: fix missing of_node_put() in of_nvmem_device

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Message-Id: <20200917134437.16637-5-srinivas.kandagatla@linaro.org>
Date:   Thu, 17 Sep 2020 14:44:37 +0100
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     gregkh@...uxfoundation.org
Cc:     linux-kernel@...r.kernel.org,
        Vadym Kochan <vadym.kochan@...ision.eu>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Subject: [PATCH 4/4] nvmem: core: fix missing of_node_put() in of_nvmem_device_get()

From: Vadym Kochan <vadym.kochan@...ision.eu>

of_parse_phandle() returns device_node with incremented ref count
which needs to be decremented by of_node_put() when device_node
is not used.

Fixes: e2a5402ec7c6 ("nvmem: Add nvmem_device based consumer apis.")
Signed-off-by: Vadym Kochan <vadym.kochan@...ision.eu>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
---
 drivers/nvmem/core.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
index 96ac8a632a7a..ab57289fe593 100644
--- a/drivers/nvmem/core.c
+++ b/drivers/nvmem/core.c
@@ -835,6 +835,7 @@ struct nvmem_device *of_nvmem_device_get(struct device_node *np, const char *id)
 {
 
 	struct device_node *nvmem_np;
+	struct nvmem_device *nvmem;
 	int index = 0;
 
 	if (id)
@@ -844,7 +845,9 @@ struct nvmem_device *of_nvmem_device_get(struct device_node *np, const char *id)
 	if (!nvmem_np)
 		return ERR_PTR(-ENOENT);
 
-	return __nvmem_device_get(nvmem_np, device_match_of_node);
+	nvmem = __nvmem_device_get(nvmem_np, device_match_of_node);
+	of_node_put(nvmem_np);
+	return nvmem;
 }
 EXPORT_SYMBOL_GPL(of_nvmem_device_get);
 #endif
-- 
2.21.0