[PATCH stable 6.1 1/2] cacheinfo: Decrement refcount in cache_setup_of_node()

[Florian Fainelli]

From: Pierre Gondois <pierre.gondois@xxxxxxx>

commit 3da72e18371c41a6f6f96b594854b178168c7757 upstream

Refcounts to DT nodes are only incremented in the function
and never decremented. Decrease the refcounts when necessary.

Signed-off-by: Pierre Gondois <pierre.gondois@xxxxxxx>
Reviewed-by: Sudeep Holla <sudeep.holla@xxxxxxx>
Link: https://lore.kernel.org/r/20221026185954.991547-1-pierre.gondois@xxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Florian Fainelli <florian.fainelli@xxxxxxxxxxxx>
---
 drivers/base/cacheinfo.c | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/drivers/base/cacheinfo.c b/drivers/base/cacheinfo.c
index 9e11d42b0d64..54a66e4a3460 100644
--- a/drivers/base/cacheinfo.c
+++ b/drivers/base/cacheinfo.c
@@ -195,7 +195,7 @@ static void cache_of_set_props(struct cacheinfo *this_leaf,
 
 static int cache_setup_of_node(unsigned int cpu)
 {
-	struct device_node *np;
+	struct device_node *np, *prev;
 	struct cacheinfo *this_leaf;
 	unsigned int index = 0;
 
@@ -205,19 +205,24 @@ static int cache_setup_of_node(unsigned int cpu)
 		return -ENOENT;
 	}
 
+	prev = np;
+
 	while (index < cache_leaves(cpu)) {
 		this_leaf = per_cpu_cacheinfo_idx(cpu, index);
-		if (this_leaf->level != 1)
+		if (this_leaf->level != 1) {
 			np = of_find_next_cache_node(np);
-		else
-			np = of_node_get(np);/* cpu node itself */
-		if (!np)
-			break;
+			of_node_put(prev);
+			prev = np;
+			if (!np)
+				break;
+		}
 		cache_of_set_props(this_leaf, np);
 		this_leaf->fw_token = np;
 		index++;
 	}
 
+	of_node_put(np);
+
 	if (index != cache_leaves(cpu)) /* not all OF nodes populated */
 		return -ENOENT;
 
-- 
2.34.1