linux-kernel - [PATCH 5.3 195/197] of: reserved_mem: add missing of_node

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Message-Id: <20191027203407.014246162@linuxfoundation.org>
Date:   Sun, 27 Oct 2019 22:01:53 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Chris Goldsworthy <cgoldswo@...eaurora.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Rob Herring <robh@...nel.org>
Subject: [PATCH 5.3 195/197] of: reserved_mem: add missing of_node_put() for proper ref-counting

From: Chris Goldsworthy <cgoldswo@...eaurora.org>

commit 5dba51754b04a941a1064f584e7a7f607df3f9bc upstream.

Commit d698a388146c ("of: reserved-memory: ignore disabled memory-region
nodes") added an early return in of_reserved_mem_device_init_by_idx(), but
didn't call of_node_put() on a device_node whose ref-count was incremented
in the call to of_parse_phandle() preceding the early exit.

Fixes: d698a388146c ("of: reserved-memory: ignore disabled memory-region nodes")
Signed-off-by: Chris Goldsworthy <cgoldswo@...eaurora.org>
Cc: stable@...r.kernel.org
Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>
Signed-off-by: Rob Herring <robh@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/of/of_reserved_mem.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/of/of_reserved_mem.c
+++ b/drivers/of/of_reserved_mem.c
@@ -324,8 +324,10 @@ int of_reserved_mem_device_init_by_idx(s
 	if (!target)
 		return -ENODEV;
 
-	if (!of_device_is_available(target))
+	if (!of_device_is_available(target)) {
+		of_node_put(target);
 		return 0;
+	}
 
 	rmem = __find_rmem(target);
 	of_node_put(target);