[PATCH 3/4] [block-manager] remove spurious decrement of write_lock_pending in the case of a recycled block.

[Joe Thornber <ejt@redhat.com>]

---
 drivers/md/persistent-data/dm-block-manager.c |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)

diff --git a/drivers/md/persistent-data/dm-block-manager.c b/drivers/md/persistent-data/dm-block-manager.c
index b68be88..d27ab6e 100644
--- a/drivers/md/persistent-data/dm-block-manager.c
+++ b/drivers/md/persistent-data/dm-block-manager.c
@@ -756,9 +756,15 @@ retry:
 
 				b->write_lock_pending++;
 				__wait_unlocked(b, &flags);
-				b->write_lock_pending--;
 				if (b->where != block)
+					/*
+					 * Recycled blocks have their
+					 * write_lock_pending count reset
+					 * to zero, so no need to undo the
+					 * above increment.
+					 */
 					goto retry;
+				b->write_lock_pending--;
 			}
 			break;
 		}
-- 
1.7.4.1