[PATCH] power: reset: reboot-mode: drop the device reference on unregister

[Wentao Liang]

reboot_mode_unregister_device() looks the device up with
class_find_device(), which takes a reference that the caller has to drop
with put_device().  The function only calls device_unregister(), which
drops the reference taken when the device was registered.  The lookup
reference therefore leaks and the struct device allocated by
device_create() is never freed.

Drop the class_find_device() reference before unregistering, the same
way device_destroy() does.

Fixes: cfaf0a90789a ("power: reset: reboot-mode: Expose sysfs for registered reboot_modes")
Cc: stable@xxxxxxxxxxxxxxx
Assisted-by: DeepSeek-V4.1-Flash and OpenAI Codex
Signed-off-by: Wentao Liang <vulab@xxxxxxxxxxx>
---
 drivers/power/reset/reboot-mode.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/power/reset/reboot-mode.c b/drivers/power/reset/reboot-mode.c
index 3611bed341e1..db55b71f0c7e 100644
--- a/drivers/power/reset/reboot-mode.c
+++ b/drivers/power/reset/reboot-mode.c
@@ -249,6 +249,8 @@ static inline void reboot_mode_unregister_device(struct reboot_mode_driver *rebo
 		return;
 
 	priv = dev_get_drvdata(reboot_mode_device);
+	/* matches class_find_device() above */
+	put_device(reboot_mode_device);
 	device_unregister(reboot_mode_device);
 
 	if (!priv)
-- 
2.34.1