rwsem: shorter spinlocked section in rwsem_down_failed_common()

[karo-tx-linux.git] / lib / rwsem.c

diff --git a/lib/rwsem.c b/lib/rwsem.c
index 672eb33218acc0cb0fa8afdeb06112e6b7cb265d..40636454cf3cf7215969db7985affbae5edd2f38 100644 (file)
--- a/lib/rwsem.c
+++ b/lib/rwsem.c
@@ -188,14 +188,12 @@ rwsem_down_failed_common(struct rw_semaphore *sem,
        struct task_struct *tsk = current;
        signed long count;
 
-       set_task_state(tsk, TASK_UNINTERRUPTIBLE);
-
        /* set up my own style of waitqueue */
-       raw_spin_lock_irq(&sem->wait_lock);
        waiter.task = tsk;
        waiter.type = type;
        get_task_struct(tsk);
 
+       raw_spin_lock_irq(&sem->wait_lock);
        if (list_empty(&sem->wait_list))
                adjustment += RWSEM_WAITING_BIAS;
        list_add_tail(&waiter.list, &sem->wait_list);
@@ -218,7 +216,8 @@ rwsem_down_failed_common(struct rw_semaphore *sem,
        raw_spin_unlock_irq(&sem->wait_lock);
 
        /* wait to be given the lock */
-       for (;;) {
+       while (true) {
+               set_task_state(tsk, TASK_UNINTERRUPTIBLE);
                if (!waiter.task)
                        break;
 
@@ -231,7 +230,6 @@ rwsem_down_failed_common(struct rw_semaphore *sem,
                        }
                raw_spin_unlock_irq(&sem->wait_lock);
                schedule();
-               set_task_state(tsk, TASK_UNINTERRUPTIBLE);
        }
 
        tsk->state = TASK_RUNNING;