1 files changed, 19 insertions, 47 deletions

diff --git a/lib/rwsem-spinlock.c b/lib/rwsem-spinlock.c
index 40ffde940a86..db4fed74b940 100644
--- a/lib/rwsem-spinlock.c
+++ b/lib/rwsem-spinlock.c
@@ -17,27 +17,22 @@ struct rwsem_waiter {
 #define RWSEM_WAITING_FOR_WRITE 0x00000002
 };
 
-#if RWSEM_DEBUG
-void rwsemtrace(struct rw_semaphore *sem, const char *str)
-{
-        if (sem->debug)
-                printk("[%d] %s({%d,%d})\n",
-                       current->pid, str, sem->activity,
-                       list_empty(&sem->wait_list) ? 0 : 1);
-}
-#endif
-
 /*
  * initialise the semaphore
  */
-void fastcall init_rwsem(struct rw_semaphore *sem)
+void __init_rwsem(struct rw_semaphore *sem, const char *name,
+                  struct lock_class_key *key)
 {
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+        /*
+         * Make sure we are not reinitializing a held semaphore:
+         */
+        debug_check_no_locks_freed((void *)sem, sizeof(*sem));
+        lockdep_init_map(&sem->dep_map, name, key);
+#endif
         sem->activity = 0;
         spin_lock_init(&sem->wait_lock);
         INIT_LIST_HEAD(&sem->wait_list);
-#if RWSEM_DEBUG
-        sem->debug = 0;
-#endif
 }
 
 /*
@@ -56,8 +51,6 @@ __rwsem_do_wake(struct rw_semaphore *sem, int wakewrite)
         struct task_struct *tsk;
         int woken;
 
-        rwsemtrace(sem, "Entering __rwsem_do_wake");
-
         waiter = list_entry(sem->wait_list.next, struct rwsem_waiter, list);
 
         if (!wakewrite) {
@@ -104,7 +97,6 @@ __rwsem_do_wake(struct rw_semaphore *sem, int wakewrite)
         sem->activity += woken;
 
  out:
-        rwsemtrace(sem, "Leaving __rwsem_do_wake");
         return sem;
 }
 
@@ -138,8 +130,6 @@ void fastcall __sched __down_read(struct rw_semaphore *sem)
         struct rwsem_waiter waiter;
         struct task_struct *tsk;
 
-        rwsemtrace(sem, "Entering __down_read");
-
         spin_lock_irq(&sem->wait_lock);
 
         if (sem->activity >= 0 && list_empty(&sem->wait_list)) {
@@ -171,9 +161,8 @@ void fastcall __sched __down_read(struct rw_semaphore *sem)
         }
 
         tsk->state = TASK_RUNNING;
-
  out:
-        rwsemtrace(sem, "Leaving __down_read");
+        ;
 }
 
 /*
@@ -184,7 +173,6 @@ int fastcall __down_read_trylock(struct rw_semaphore *sem)
         unsigned long flags;
         int ret = 0;
 
-        rwsemtrace(sem, "Entering __down_read_trylock");
 
         spin_lock_irqsave(&sem->wait_lock, flags);
 
@@ -196,7 +184,6 @@ int fastcall __down_read_trylock(struct rw_semaphore *sem)
 
         spin_unlock_irqrestore(&sem->wait_lock, flags);
 
-        rwsemtrace(sem, "Leaving __down_read_trylock");
         return ret;
 }
 
@@ -204,13 +191,11 @@ int fastcall __down_read_trylock(struct rw_semaphore *sem)
  * get a write lock on the semaphore
  * - we increment the waiting count anyway to indicate an exclusive lock
  */
-void fastcall __sched __down_write(struct rw_semaphore *sem)
+void fastcall __sched __down_write_nested(struct rw_semaphore *sem, int subclass)
 {
         struct rwsem_waiter waiter;
         struct task_struct *tsk;
 
-        rwsemtrace(sem, "Entering __down_write");
-
         spin_lock_irq(&sem->wait_lock);
 
         if (sem->activity == 0 && list_empty(&sem->wait_list)) {
@@ -242,9 +227,13 @@ void fastcall __sched __down_write(struct rw_semaphore *sem)
         }
 
         tsk->state = TASK_RUNNING;
-
  out:
-        rwsemtrace(sem, "Leaving __down_write");
+        ;
+}
+
+void fastcall __sched __down_write(struct rw_semaphore *sem)
+{
+        __down_write_nested(sem, 0);
 }
 
 /*
@@ -255,8 +244,6 @@ int fastcall __down_write_trylock(struct rw_semaphore *sem)
         unsigned long flags;
         int ret = 0;
 
-        rwsemtrace(sem, "Entering __down_write_trylock");
-
         spin_lock_irqsave(&sem->wait_lock, flags);
 
         if (sem->activity == 0 && list_empty(&sem->wait_list)) {
@@ -267,7 +254,6 @@ int fastcall __down_write_trylock(struct rw_semaphore *sem)
 
         spin_unlock_irqrestore(&sem->wait_lock, flags);
 
-        rwsemtrace(sem, "Leaving __down_write_trylock");
         return ret;
 }
 
@@ -278,16 +264,12 @@ void fastcall __up_read(struct rw_semaphore *sem)
 {
         unsigned long flags;
 
-        rwsemtrace(sem, "Entering __up_read");
-
         spin_lock_irqsave(&sem->wait_lock, flags);
 
         if (--sem->activity == 0 && !list_empty(&sem->wait_list))
                 sem = __rwsem_wake_one_writer(sem);
 
         spin_unlock_irqrestore(&sem->wait_lock, flags);
-
-        rwsemtrace(sem, "Leaving __up_read");
 }
 
 /*
@@ -297,8 +279,6 @@ void fastcall __up_write(struct rw_semaphore *sem)
 {
         unsigned long flags;
 
-        rwsemtrace(sem, "Entering __up_write");
-
         spin_lock_irqsave(&sem->wait_lock, flags);
 
         sem->activity = 0;
@@ -306,8 +286,6 @@ void fastcall __up_write(struct rw_semaphore *sem)
                 sem = __rwsem_do_wake(sem, 1);
 
         spin_unlock_irqrestore(&sem->wait_lock, flags);
-
-        rwsemtrace(sem, "Leaving __up_write");
 }
 
 /*
@@ -318,8 +296,6 @@ void fastcall __downgrade_write(struct rw_semaphore *sem)
 {
         unsigned long flags;
 
-        rwsemtrace(sem, "Entering __downgrade_write");
-
         spin_lock_irqsave(&sem->wait_lock, flags);
 
         sem->activity = 1;
@@ -327,18 +303,14 @@ void fastcall __downgrade_write(struct rw_semaphore *sem)
                 sem = __rwsem_do_wake(sem, 0);
 
         spin_unlock_irqrestore(&sem->wait_lock, flags);
-
-        rwsemtrace(sem, "Leaving __downgrade_write");
 }
 
-EXPORT_SYMBOL(init_rwsem);
+EXPORT_SYMBOL(__init_rwsem);
 EXPORT_SYMBOL(__down_read);
 EXPORT_SYMBOL(__down_read_trylock);
+EXPORT_SYMBOL(__down_write_nested);
 EXPORT_SYMBOL(__down_write);
 EXPORT_SYMBOL(__down_write_trylock);
 EXPORT_SYMBOL(__up_read);
 EXPORT_SYMBOL(__up_write);
 EXPORT_SYMBOL(__downgrade_write);
-#if RWSEM_DEBUG
-EXPORT_SYMBOL(rwsemtrace);
-#endif