1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/block/drbd/drbd_int.h b/drivers/block/drbd/drbd_int.h
index 8aa10391115b..a74d3ee04ba8 100644
--- a/drivers/block/drbd/drbd_int.h
+++ b/drivers/block/drbd/drbd_int.h
@@ -2157,6 +2157,10 @@ static inline int get_net_conf(struct drbd_conf *mdev)
 static inline void put_ldev(struct drbd_conf *mdev)
 {
         int i = atomic_dec_return(&mdev->local_cnt);
+
+        /* This may be called from some endio handler,
+         * so we must not sleep here. */
+
         __release(local);
         D_ASSERT(i >= 0);
         if (i == 0) {