cache: ax45mp: Fix device node reference leak in ax45mp_cache_init()

[ Upstream commit 0528a34 ]

In ax45mp_cache_init(), of_find_matching_node() returns a device node
with an incremented reference count that must be released with
of_node_put(). The current code fails to call of_node_put() which
causes a reference leak.

Use the __free(device_node) attribute to ensure automatic cleanup when
the variable goes out of scope.

Fixes: d34599b ("cache: Add L2 cache management for Andes AX45MP RISC-V core")
Signed-off-by: Felix Gu <ustc.gu@gmail.com>
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

Author: outman119

drivers/cache/ax45mp_cache.c

@@ -178,11 +178,11 @@ static const struct of_device_id ax45mp_cache_ids[] = {
 
 static int __init ax45mp_cache_init(void)
 {
-	struct device_node *np;
 	struct resource res;
 	int ret;
 
-	np = of_find_matching_node(NULL, ax45mp_cache_ids);
+	struct device_node *np __free(device_node) =
+		of_find_matching_node(NULL, ax45mp_cache_ids);
 	if (!of_device_is_available(np))
 		return -ENODEV;