Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block

* 'for-linus' of git://git.kernel.dk/linux-2.6-block:
  block: Range check cpu in blk_cpu_to_group
  scatterlist: prevent invalid free when alloc fails
  writeback: Fix lost wake-up shutting down writeback thread
  writeback: do not lose wakeup events when forking bdi threads
  cciss: fix reporting of max queue depth since init
  block: switch s390 tape_block and mg_disk to elevator_change()
  block: add function call to switch the IO scheduler from a driver
  fs/bio-integrity.c: return -ENOMEM on kmalloc failure
  bio-integrity.c: remove dependency on __GFP_NOFAIL
  BLOCK: fix bio.bi_rw handling
  block: put dev->kobj in blk_register_queue fail path
  cciss: handle allocation failure
  cfq-iosched: Documentation help for new tunables
  cfq-iosched: blktrace print per slice sector stats
  cfq-iosched: Implement tunable group_idle
  cfq-iosched: Do group share accounting in IOPS when slice_idle=0
  cfq-iosched: Do not idle if slice_idle=0
  cciss: disable doorbell reset on reset_devices
  blkio: Fix return code for mkdir calls

1 files changed, 5 insertions, 2 deletions

diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index eaa4a5bbe063..c2bf86f470ed 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -445,8 +445,8 @@ static int bdi_forker_thread(void *ptr)
                 switch (action) {
                 case FORK_THREAD:
                         __set_current_state(TASK_RUNNING);
-                        task = kthread_run(bdi_writeback_thread, &bdi->wb, "flush-%s",
-                                           dev_name(bdi->dev));
+                        task = kthread_create(bdi_writeback_thread, &bdi->wb,
+                                              "flush-%s", dev_name(bdi->dev));
                         if (IS_ERR(task)) {
                                 /*
                                  * If thread creation fails, force writeout of
@@ -457,10 +457,13 @@ static int bdi_forker_thread(void *ptr)
                                 /*
                                  * The spinlock makes sure we do not lose
                                  * wake-ups when racing with 'bdi_queue_work()'.
+                                 * And as soon as the bdi thread is visible, we
+                                 * can start it.
                                  */
                                 spin_lock_bh(&bdi->wb_lock);
                                 bdi->wb.task = task;
                                 spin_unlock_bh(&bdi->wb_lock);
+                                wake_up_process(task);
                         }
                         break;