[PATCH 6.19 099/220] cache: ax45mp: Fix device node reference leak in ax45mp_cache_init()

Greg Kroah-Hartman
2026-03-23T13:54:29Z

From: Felix Gu <ustc.gu@gmail.com>

[ Upstream commit 0528a348b04b327a4611e29589beb4c9ae81304a ]

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: d34599bcd2e4 ("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>
---
drivers/cache/ax45mp_cache.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/cache/ax45mp_cache.c b/drivers/cache/ax45mp_cache.c
index 1d7dd3d2c101c..934c5087ec2bd 100644
--- a/drivers/cache/ax45mp_cache.c
+++ b/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;

--
2.51.0