Upgrade to 4.4.50-rt62

[kvmfornfv.git] / kernel / kernel / locking / mutex.c

diff --git a/kernel/kernel/locking/mutex.c b/kernel/kernel/locking/mutex.c
index 0551c21..89350f9 100644 (file)
--- a/kernel/kernel/locking/mutex.c
+++ b/kernel/kernel/locking/mutex.c
@@ -486,9 +486,6 @@ __ww_mutex_lock_check_stamp(struct mutex *lock, struct ww_acquire_ctx *ctx)
        if (!hold_ctx)
                return 0;
 
-       if (unlikely(ctx == hold_ctx))
-               return -EALREADY;
-
        if (ctx->stamp - hold_ctx->stamp <= LONG_MAX &&
            (ctx->stamp != hold_ctx->stamp || ctx > hold_ctx)) {
 #ifdef CONFIG_DEBUG_MUTEXES
@@ -514,6 +511,12 @@ __mutex_lock_common(struct mutex *lock, long state, unsigned int subclass,
        unsigned long flags;
        int ret;
 
+       if (use_ww_ctx) {
+               struct ww_mutex *ww = container_of(lock, struct ww_mutex, base);
+               if (unlikely(ww_ctx == READ_ONCE(ww->ctx)))
+                       return -EALREADY;
+       }
+
        preempt_disable();
        mutex_acquire_nest(&lock->dep_map, subclass, 0, nest_lock, ip);