serial: fix NULL pointer dereference

[safe/jmp/linux-2.6] / include / linux / lockdep.h

diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h
index 12aabfc..9ccf0e2 100644 (file)
--- a/include/linux/lockdep.h
+++ b/include/linux/lockdep.h
@@ -58,6 +58,7 @@ struct lock_class {
 
        struct lockdep_subclass_key     *key;
        unsigned int                    subclass;
+       unsigned int                    dep_gen_id;
 
        /*
         * IRQ/softirq usage tracking bits:
@@ -213,10 +214,12 @@ struct held_lock {
         * interrupt context:
         */
        unsigned int irq_context:2; /* bit 0 - soft, bit 1 - hard */
-       unsigned int trylock:1;
+       unsigned int trylock:1;                                         /* 16 bits */
+
        unsigned int read:2;        /* see lock_acquire() comment */
        unsigned int check:2;       /* see lock_acquire() comment */
        unsigned int hardirqs_off:1;
+       unsigned int references:11;                                     /* 32 bits */
 };
 
 /*
@@ -296,6 +299,10 @@ extern void lock_acquire(struct lockdep_map *lock, unsigned int subclass,
 extern void lock_release(struct lockdep_map *lock, int nested,
                         unsigned long ip);
 
+#define lockdep_is_held(lock)  lock_is_held(&(lock)->dep_map)
+
+extern int lock_is_held(struct lockdep_map *lock);
+
 extern void lock_set_class(struct lockdep_map *lock, const char *name,
                           struct lock_class_key *key, unsigned int subclass,
                           unsigned long ip);
@@ -314,6 +321,8 @@ extern void lockdep_trace_alloc(gfp_t mask);
 
 #define lockdep_depth(tsk)     (debug_locks ? (tsk)->lockdep_depth : 0)
 
+#define lockdep_assert_held(l) WARN_ON(debug_locks && !lockdep_is_held(l))
+
 #else /* !LOCKDEP */
 
 static inline void lockdep_off(void)
@@ -358,6 +367,8 @@ struct lock_class_key { };
 
 #define lockdep_depth(tsk)     (0)
 
+#define lockdep_assert_held(l)                 do { } while (0)
+
 #endif /* !LOCKDEP */
 
 #ifdef CONFIG_LOCK_STAT