[PATCH] lockdep: misc fixes in lockdep.c

 - numeric string size replaced with constant in print_lock_name and
   print_lockdep_cache,

 - return on null pointer in print_lock_dependencies,

 - one more lockdep return with 0 with unlocking fix in mark_lock.

Signed-off-by: Jarek Poplawski <jarkao2@o2.pl>
Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/kernel/lockdep.c b/kernel/lockdep.c
index f76a24f2ac20b88a1fe83135b99855e1d536f015..300d61bb314bc6f30d138a229f2b73cf35b8b44c 100644 (file)
--- a/kernel/lockdep.c
+++ b/kernel/lockdep.c
@@ -359,7 +359,7 @@ get_usage_chars(struct lock_class *class, char *c1, char *c2, char *c3, char *c4
 
 static void print_lock_name(struct lock_class *class)
 {
-       char str[128], c1, c2, c3, c4;
+       char str[KSYM_NAME_LEN + 1], c1, c2, c3, c4;
        const char *name;
 
        get_usage_chars(class, &c1, &c2, &c3, &c4);
@@ -381,7 +381,7 @@ static void print_lock_name(struct lock_class *class)
 static void print_lockdep_cache(struct lockdep_map *lock)
 {
        const char *name;
-       char str[128];
+       char str[KSYM_NAME_LEN + 1];
 
        name = lock->name;
        if (!name)
@@ -451,7 +451,9 @@ static void print_lock_dependencies(struct lock_class *class, int depth)
        print_lock_class_header(class, depth);
 
        list_for_each_entry(entry, &class->locks_after, entry) {
-               DEBUG_LOCKS_WARN_ON(!entry->class);
+               if (DEBUG_LOCKS_WARN_ON(!entry->class))
+                       return;
+
                print_lock_dependencies(entry->class, depth + 1);
 
                printk("%*s ... acquired at:\n",depth,"");
@@ -1733,6 +1735,7 @@ static int mark_lock(struct task_struct *curr, struct held_lock *this,
                debug_atomic_dec(&nr_unused_locks);
                break;
        default:
+               __raw_spin_unlock(&hash_lock);
                debug_locks_off();
                WARN_ON(1);
                return 0;