Patch "clk: st: Hold reference returned by of_get_parent()" has been added to the 6.0-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    clk: st: Hold reference returned by of_get_parent()

to the 6.0-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     clk-st-hold-reference-returned-by-of_get_parent.patch
and it can be found in the queue-6.0 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 2cc16f8c18499c7cda01049e535c3abf8e1467b4
Author: Liang He <windhl@xxxxxxx>
Date:   Tue Jun 28 22:24:15 2022 +0800

    clk: st: Hold reference returned by of_get_parent()
    
    [ 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@xxxxxxx>
    Link: https://lore.kernel.org/r/20220628142416.169808-1-windhl@xxxxxxx
    Signed-off-by: Stephen Boyd <sboyd@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

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;