[PATCH 4/5] firewire: core: Prevent device_find_child() from modifying caller's match data

[Zijun Hu <zijun_hu@icloud.com>]

From: Zijun Hu <quic_zijuhu@quicinc.com>

It does not make sense for lookup_existing_device() as match function
of device_find_child() to modify caller's match data, fixed by using
constify_device_find_child_helper() instead of device_find_child().

Signed-off-by: Zijun Hu <quic_zijuhu@quicinc.com>
---
 drivers/firewire/core-device.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/firewire/core-device.c b/drivers/firewire/core-device.c
index 00e9a13e6c45..04b150bc876d 100644
--- a/drivers/firewire/core-device.c
+++ b/drivers/firewire/core-device.c
@@ -1087,8 +1087,9 @@ static void fw_device_init(struct work_struct *work)
 		return;
 	}
 
-	revived_dev = device_find_child(card->device,
-					device, lookup_existing_device);
+	revived_dev = constify_device_find_child_helper(card->device,
+							device,
+							lookup_existing_device);
 	if (revived_dev) {
 		put_device(revived_dev);
 		fw_device_release(&device->device);

-- 
2.34.1