Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux

[linux.git] / drivers / md / dm-crypt.c

diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c
index 917d47e290ae08be08f4c964a3326f1f67acd077..3147c8d09ea84a0a76d0fd7ead35931a89e29aed 100644 (file)
--- a/drivers/md/dm-crypt.c
+++ b/drivers/md/dm-crypt.c
@@ -112,7 +112,8 @@ struct iv_tcw_private {
  * and encrypts / decrypts at the same time.
  */
 enum flags { DM_CRYPT_SUSPENDED, DM_CRYPT_KEY_VALID,
-            DM_CRYPT_SAME_CPU, DM_CRYPT_NO_OFFLOAD };
+            DM_CRYPT_SAME_CPU, DM_CRYPT_NO_OFFLOAD,
+            DM_CRYPT_EXIT_THREAD};
 
 /*
  * The fields in here must be read only after initialization.
@@ -1203,20 +1204,18 @@ static int dmcrypt_write(void *data)
                if (!RB_EMPTY_ROOT(&cc->write_tree))
                        goto pop_from_list;
 
+               if (unlikely(test_bit(DM_CRYPT_EXIT_THREAD, &cc->flags))) {
+                       spin_unlock_irq(&cc->write_thread_wait.lock);
+                       break;
+               }
+
                __set_current_state(TASK_INTERRUPTIBLE);
                __add_wait_queue(&cc->write_thread_wait, &wait);
 
                spin_unlock_irq(&cc->write_thread_wait.lock);
 
-               if (unlikely(kthread_should_stop())) {
-                       set_task_state(current, TASK_RUNNING);
-                       remove_wait_queue(&cc->write_thread_wait, &wait);
-                       break;
-               }
-
                schedule();
 
-               set_task_state(current, TASK_RUNNING);
                spin_lock_irq(&cc->write_thread_wait.lock);
                __remove_wait_queue(&cc->write_thread_wait, &wait);
                goto continue_locked;
@@ -1531,8 +1530,13 @@ static void crypt_dtr(struct dm_target *ti)
        if (!cc)
                return;
 
-       if (cc->write_thread)
+       if (cc->write_thread) {
+               spin_lock_irq(&cc->write_thread_wait.lock);
+               set_bit(DM_CRYPT_EXIT_THREAD, &cc->flags);
+               wake_up_locked(&cc->write_thread_wait);
+               spin_unlock_irq(&cc->write_thread_wait.lock);
                kthread_stop(cc->write_thread);
+       }
 
        if (cc->io_queue)
                destroy_workqueue(cc->io_queue);