cache: starfive: fix device node leak in starlink_cache_init()

[ Upstream commit 3c85234 ]

of_find_matching_node() returns a device_node with refcount incremented.

Use __free(device_node) attribute to automatically call of_node_put()
when the variable goes out of scope, preventing the refcount leak.

Fixes: cabff60 ("cache: Add StarFive StarLink cache management")
Signed-off-by: Felix Gu <ustc.gu@gmail.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

Author: outman119

drivers/cache/starfive_starlink_cache.c

@@ -102,11 +102,11 @@ static const struct of_device_id starlink_cache_ids[] = {
 
 static int __init starlink_cache_init(void)
 {
-	struct device_node *np;
 	u32 block_size;
 	int ret;
 
-	np = of_find_matching_node(NULL, starlink_cache_ids);
+	struct device_node *np __free(device_node) =
+		of_find_matching_node(NULL, starlink_cache_ids);
 	if (!of_device_is_available(np))
 		return -ENODEV;