[PATCH] rv: Fix missing mutex unlock in rv_register_monitor()

[Zhen Ni]

If create_monitor_dir() fails, the function returns directly without
releasing rv_interface_lock. This leaves the mutex locked and causes
subsequent monitor registration attempts to deadlock.

Fix it by making the error path jump to out_unlock, ensuring that the
mutex is always released before returning.

Fixes: 24cbfe18d55a ("rv: Merge struct rv_monitor_def into struct rv_monitor")
Signed-off-by: Zhen Ni <zhen...@easystack.cn>
---
 kernel/trace/rv/rv.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/trace/rv/rv.c b/kernel/trace/rv/rv.c
index 1482e91c39f4..e35565dd2dc5 100644
--- a/kernel/trace/rv/rv.c
+++ b/kernel/trace/rv/rv.c
@@ -805,7 +805,7 @@ int rv_register_monitor(struct rv_monitor *monitor, struct 
rv_monitor *parent)
 
        retval = create_monitor_dir(monitor, parent);
        if (retval)
-               return retval;
+               goto out_unlock;
 
        /* keep children close to the parent for easier visualisation */
        if (parent)
-- 
2.20.1