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[PATCH] lockdep: internal locking fixes 

Here are mainly some lockdep returns with 0 with unlocking fixes.

Signed-off-by: Jarek Poplawski <jarkao2@o2.pl>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Jarek Poplawski 2006-12-07 10:45:25 +01:00 committed by Linus Torvalds
parent b4178ab58a
commit 910b1b2e6d
1 changed files with 15 additions and 10 deletions
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25
kernel/lockdep.c
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@ -237,8 +237,10 @@ e locks. */
trace->max_entries = trace->nr_entries;
nr_stack_trace_entries += trace->nr_entries;
if (DEBUG_LOCKS_WARN_ON(nr_stack_trace_entries > MAX_STACK_TRACE_ENTRIES))
if (DEBUG_LOCKS_WARN_ON(nr_stack_trace_entries > MAX_STACK_TRACE_ENTRIES)) {
__raw_spin_unlock(&hash_lock);
return 0;
}
if (nr_stack_trace_entries == MAX_STACK_TRACE_ENTRIES) {
__raw_spin_unlock(&hash_lock);
@ -474,7 +476,8 @@ static int add_lock_to_list(struct lock_class *class, struct lock_class *this,
return 0;
entry->class = this;
save_trace(&entry->trace);
if (!save_trace(&entry->trace))
return 0;
/*
* Since we never remove from the dependency list, the list can
@ -562,8 +565,12 @@ static noinline int print_circular_bug_tail(void)
if (debug_locks_silent)
return 0;
/* hash_lock unlocked by the header */
__raw_spin_lock(&hash_lock);
this.class = check_source->class;
save_trace(&this.trace);
if (!save_trace(&this.trace))
return 0;
__raw_spin_unlock(&hash_lock);
print_circular_bug_entry(&this, 0);
printk("\nother info that might help us debug this:\n\n");
@ -966,14 +973,11 @@ check_prev_add(struct task_struct *curr, struct held_lock *prev,
&prev->class->locks_after, next->acquire_ip);
if (!ret)
return 0;
/*
* Return value of 2 signals 'dependency already added',
* in that case we dont have to add the backlink either.
*/
if (ret == 2)
return 2;
ret = add_lock_to_list(next->class, prev->class,
&next->class->locks_before, next->acquire_ip);
if (!ret)
return 0;
/*
* Debugging printouts:
@ -1025,7 +1029,8 @@ check_prevs_add(struct task_struct *curr, struct held_lock *next)
* added:
*/
if (hlock->read != 2) {
check_prev_add(curr, hlock, next);
if (!check_prev_add(curr, hlock, next))
return 0;
/*
* Stop after the first non-trylock entry,
* as non-trylock entries have added their