dm kcopyd: introduce the function submit_job

We move some code to a function submit_job. It is needed for the next
patch that calls submit_job from another place.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>

---
 drivers/md/dm-kcopyd.c |   19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

Index: linux-4.8.6/drivers/md/dm-kcopyd.c
===================================================================
--- linux-4.8.6.orig/drivers/md/dm-kcopyd.c	2016-11-02 17:58:53.000000000 +0100
+++ linux-4.8.6/drivers/md/dm-kcopyd.c	2016-11-02 18:13:51.000000000 +0100
@@ -699,6 +699,17 @@ static void split_job(struct kcopyd_job 
 	}
 }
 
+static void submit_job(struct kcopyd_job *job)
+{
+	if (job->source.count <= SUB_JOB_SIZE)
+		dispatch_job(job);
+	else {
+		mutex_init(&job->lock);
+		job->progress = 0;
+		split_job(job);
+	}
+}
+
 int dm_kcopyd_copy(struct dm_kcopyd_client *kc, struct dm_io_region *from,
 		   unsigned int num_dests, struct dm_io_region *dests,
 		   unsigned int flags, dm_kcopyd_notify_fn fn, void *context)
@@ -747,13 +758,7 @@ int dm_kcopyd_copy(struct dm_kcopyd_clie
 	job->context = context;
 	job->master_job = job;
 
-	if (job->source.count <= SUB_JOB_SIZE)
-		dispatch_job(job);
-	else {
-		mutex_init(&job->lock);
-		job->progress = 0;
-		split_job(job);
-	}
+	submit_job(job);
 
 	return 0;
 }