[PATCH 5.19 382/717] clk: st: Hold reference returned by of_get_parent()

Greg Kroah-Hartman
2022-10-22T09:05:34Z

From: Liang He <windhl@126.com>

[ Upstream commit 429973306f860470cbbb8402c8c53143b450faba ]

We should hold the reference returned by of_get_parent() and use it
to call of_node_put() for refcount balance.

Fixes: 3efe64ef5186 ("clk: st: clkgen-fsyn: search reg within node or parent")
Fixes: 810251b0d36a ("clk: st: clkgen-mux: search reg within node or parent")

Signed-off-by: Liang He <windhl@126.com>
Link: https://lore.kernel.org/r/20220628142416.169808-1-windhl@126.com
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/clk/st/clkgen-fsyn.c | 5 ++++-
drivers/clk/st/clkgen-mux.c | 5 ++++-
2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/clk/st/clkgen-fsyn.c b/drivers/clk/st/clkgen-fsyn.c
index 582a22c04919..d820292a381d 100644
--- a/drivers/clk/st/clkgen-fsyn.c
+++ b/drivers/clk/st/clkgen-fsyn.c
@@ -987,6 +987,7 @@ static void __init st_of_quadfs_setup(struct device_node *np,
const char *pll_name, *clk_parent_name;
void __iomem *reg;
spinlock_t *lock;
+ struct device_node *parent_np;

/*
* First check for reg property within the node to keep backward
@@ -994,7 +995,9 @@ static void __init st_of_quadfs_setup(struct device_node *np,
*/
reg = of_iomap(np, 0);
if (!reg) {
- reg = of_iomap(of_get_parent(np), 0);
+ parent_np = of_get_parent(np);
+ reg = of_iomap(parent_np, 0);
+ of_node_put(parent_np);
if (!reg) {
pr_err("%s: Failed to get base address\n", __func__);
return;
diff --git a/drivers/clk/st/clkgen-mux.c b/drivers/clk/st/clkgen-mux.c
index ee39af7a0b72..596e939ad905 100644
--- a/drivers/clk/st/clkgen-mux.c
+++ b/drivers/clk/st/clkgen-mux.c
@@ -56,6 +56,7 @@ static void __init st_of_clkgen_mux_setup(struct device_node *np,
void __iomem *reg;
const char **parents;
int num_parents = 0;
+ struct device_node *parent_np;

/*
* First check for reg property within the node to keep backward
@@ -63,7 +64,9 @@ static void __init st_of_clkgen_mux_setup(struct device_node *np,
*/
reg = of_iomap(np, 0);
if (!reg) {
- reg = of_iomap(of_get_parent(np), 0);
+ parent_np = of_get_parent(np);
+ reg = of_iomap(parent_np, 0);
+ of_node_put(parent_np);
if (!reg) {
pr_err("%s: Failed to get base address\n", __func__);
return;
--
2.35.1