Merge tag 'dm-4.9-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/device...

Pull device mapper fixes from Mike Snitzer:

 - a couple DM raid and DM mirror fixes

 - a couple .request_fn request-based DM NULL pointer fixes

 - a fix for a DM target reference count leak, on target load error,
   that prevented associated DM target kernel module(s) from being
   removed

* tag 'dm-4.9-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm:
  dm table: fix missing dm_put_target_type() in dm_table_add_target()
  dm rq: clear kworker_task if kthread_run() returned an error
  dm: free io_barrier after blk_cleanup_queue call
  dm raid: fix activation of existing raid4/10 devices
  dm mirror: use all available legs on multiple failures
  dm mirror: fix read error on recovery after default leg failure
  dm raid: fix compat_features validation

diff --cc drivers/md/dm-rq.c
index dc75bea,63e43f2..1d0d2ad
--- 1/drivers/md/dm-rq.c
--- 2/drivers/md/dm-rq.c
+++ b/drivers/md/dm-rq.c
@@@ -853,11 -853,14 +853,14 @@@ int dm_old_init_request_queue(struct ma
        blk_queue_prep_rq(md->queue, dm_old_prep_fn);
  
        /* Initialize the request-based DM worker thread */
 -      init_kthread_worker(&md->kworker);
 +      kthread_init_worker(&md->kworker);
        md->kworker_task = kthread_run(kthread_worker_fn, &md->kworker,
                                       "kdmwork-%s", dm_device_name(md));
-       if (IS_ERR(md->kworker_task))
-               return PTR_ERR(md->kworker_task);
+       if (IS_ERR(md->kworker_task)) {
+               int error = PTR_ERR(md->kworker_task);
+               md->kworker_task = NULL;
+               return error;
+       }
  
        elv_register_queue(md->queue);
  

diff --cc drivers/md/dm.c
Simple merge