diff options
| author | Mark Brown <broonie@kernel.org> | 2016-07-29 21:38:37 +0100 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2016-07-29 21:38:37 +0100 |
| commit | da9a92f0cde9ce34a930d7edcaef30429e41d14a (patch) | |
| tree | 44095fbc8f83990330437d11c7a9fc699a5e2521 /kernel/locking/mutex.c | |
| parent | aa6b4960f4571ecc422a13b2490e91f5debb64a1 (diff) | |
| parent | b0ba6b0a5eb2b51037a07dbf5a7470ca804d575c (diff) | |
Merge branch 'linux-linaro-lsk-v4.4' into linux-linaro-lsk-v4.4-androidlsk-v4.4-16.07-android
Diffstat (limited to 'kernel/locking/mutex.c')
| -rw-r--r-- | kernel/locking/mutex.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/kernel/locking/mutex.c b/kernel/locking/mutex.c index 0551c219c40e..89350f924c85 100644 --- a/kernel/locking/mutex.c +++ b/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); |