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Merge branch 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

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Pull w/w mutex deadlock injection fix from Ingo Molnar.

This bug made the CONFIG_DEBUG_WW_MUTEX_SLOWPATH=y option largely
useless, but wouldn't affect normal users.

* 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  mutex: Fix w/w mutex deadlock injection
This commit is contained in:
Linus Torvalds 2013-08-12 12:01:28 -07:00
commit 278225588d
1 changed files with 2 additions and 2 deletions
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4
kernel/mutex.c
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@ -686,7 +686,7 @@ __ww_mutex_lock(struct ww_mutex *lock, struct ww_acquire_ctx *ctx)
might_sleep();
ret = __mutex_lock_common(&lock->base, TASK_UNINTERRUPTIBLE,
0, &ctx->dep_map, _RET_IP_, ctx);
if (!ret && ctx->acquired > 0)
if (!ret && ctx->acquired > 1)
return ww_mutex_deadlock_injection(lock, ctx);
return ret;
@ -702,7 +702,7 @@ __ww_mutex_lock_interruptible(struct ww_mutex *lock, struct ww_acquire_ctx *ctx)
ret = __mutex_lock_common(&lock->base, TASK_INTERRUPTIBLE,
0, &ctx->dep_map, _RET_IP_, ctx);
if (!ret && ctx->acquired > 0)
if (!ret && ctx->acquired > 1)
return ww_mutex_deadlock_injection(lock, ctx);
return ret;