linux-kernel - [PATCH 1/3] spmi: pmic-arb: fix return path in for_each_available_child_of

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Message-ID: <20241109002829.160973-2-sboyd@kernel.org>
Date: Fri,  8 Nov 2024 16:28:26 -0800
From: Stephen Boyd <sboyd@...nel.org>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Javier Carrasco <javier.carrasco.cruz@...il.com>,
	linux-kernel@...r.kernel.org,
	patches@...ts.linux.dev,
	stable@...r.kernel.org,
	Neil Armstrong <neil.armstrong@...aro.org>
Subject: [PATCH 1/3] spmi: pmic-arb: fix return path in for_each_available_child_of_node()

From: Javier Carrasco <javier.carrasco.cruz@...il.com>

This loop requires explicit calls to of_node_put() upon early exits
(break, goto, return) to decrement the child refcounter and avoid memory
leaks if the child is not required out of the loop.

A more robust solution is using the scoped variant of the macro, which
automatically calls of_node_put() when the child goes out of scope.

Cc: stable@...r.kernel.org
Fixes: 979987371739 ("spmi: pmic-arb: Add multi bus support")
Signed-off-by: Javier Carrasco <javier.carrasco.cruz@...il.com>
Link: https://lore.kernel.org/r/20241001-spmi-pmic-arb-scoped-v1-1-5872bab34ed6@gmail.com
Reviewed-by: Neil Armstrong <neil.armstrong@...aro.org>
Signed-off-by: Stephen Boyd <sboyd@...nel.org>
---
 drivers/spmi/spmi-pmic-arb.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/spmi/spmi-pmic-arb.c b/drivers/spmi/spmi-pmic-arb.c
index 9ba9495fcc4b..ea843159b745 100644
--- a/drivers/spmi/spmi-pmic-arb.c
+++ b/drivers/spmi/spmi-pmic-arb.c
@@ -1763,14 +1763,13 @@ static int spmi_pmic_arb_register_buses(struct spmi_pmic_arb *pmic_arb,
 {
 	struct device *dev = &pdev->dev;
 	struct device_node *node = dev->of_node;
-	struct device_node *child;
 	int ret;
 
 	/* legacy mode doesn't provide child node for the bus */
 	if (of_device_is_compatible(node, "qcom,spmi-pmic-arb"))
 		return spmi_pmic_arb_bus_init(pdev, node, pmic_arb);
 
-	for_each_available_child_of_node(node, child) {
+	for_each_available_child_of_node_scoped(node, child) {
 		if (of_node_name_eq(child, "spmi")) {
 			ret = spmi_pmic_arb_bus_init(pdev, child, pmic_arb);
 			if (ret)
-- 
https://git.kernel.org/pub/scm/linux/kernel/git/clk/linux.git/
https://git.kernel.org/pub/scm/linux/kernel/git/sboyd/spmi.git