rtmutex: Avoid deadlock in rt_mutex_start_proxy_lock()

[mirror_ubuntu-bionic-kernel.git] / kernel / rtmutex.c

diff --git a/kernel/rtmutex.c b/kernel/rtmutex.c
index fcd107a78c5a1070c96ace2719d12bfe59a825f0..29bd4baf9e756d848895a868bd25c103f6ee1f85 100644 (file)
--- a/kernel/rtmutex.c
+++ b/kernel/rtmutex.c
@@ -1039,16 +1039,14 @@ int rt_mutex_start_proxy_lock(struct rt_mutex *lock,
        if (!rt_mutex_owner(lock) || try_to_steal_lock(lock, task)) {
                /* We got the lock for task. */
                debug_rt_mutex_lock(lock);
-
                rt_mutex_set_owner(lock, task, 0);
-
+               spin_unlock(&lock->wait_lock);
                rt_mutex_deadlock_account_lock(lock, task);
                return 1;
        }
 
        ret = task_blocks_on_rt_mutex(lock, waiter, task, detect_deadlock);
 
-
        if (ret && !waiter->task) {
                /*
                 * Reset the return value. We might have