diff --git a/dm-sflc/src/lite/flush.c b/dm-sflc/src/lite/flush.c
index 2079a0d..c9612f2 100644
--- a/dm-sflc/src/lite/flush.c
+++ b/dm-sflc/src/lite/flush.c
@@ -193,6 +193,7 @@ static int issue_lowlevel_flush(struct sflite_volume *svol, struct bio *orig_bio
 {
 	struct bio *clone;
 	DECLARE_COMPLETION_ONSTACK(compl);
+	int err = 0;
 
 	// Can either issue a brand-new request
 	if (orig_bio == NULL)
@@ -209,9 +210,10 @@ static int issue_lowlevel_flush(struct sflite_volume *svol, struct bio *orig_bio
 	// Submit and wait
 	dm_submit_bio_remap(orig_bio, clone);
 	wait_for_completion_io(&compl);
+	err = blk_status_to_errno(orig_bio->bi_status);
 
 	bio_put(clone);
-	return blk_status_to_errno(orig_bio->bi_status);
+	return err;
 }
 
 
@@ -314,8 +316,8 @@ int sflite_flush_posmap(struct sflite_volume *svol, struct bio *orig_bio, gfp_t
 	 * of the posmap blocks: those whose CWB did not fail, and whose seqnum
 	 * did not change while we were not holding the locks.
 	 * If some CWBs failed, we return an error (then failing the upper-layer
-	 * bio in the caller, if there is one), but that doesn't mean aborting
-	 * entirely, because we can still mark some blocks as clean.
+	 * bio in the caller), but that doesn't mean aborting entirely, because
+	 * we can still mark some blocks as clean.
 	 * Here, we need to lock again. */
 	down_write(&svol->posmap.flush_lock);	// Not killable, for simplicity
 	err = mark_posmap_blocks_clean(svol);
diff --git a/docs/locking.md b/docs/locking.md
index 64ca714..5d16fd9 100644
--- a/docs/locking.md
+++ b/docs/locking.md
@@ -75,7 +75,7 @@ fn flush():
 	
 	rwsem.down_write();
 	// Some blocks might be marked clean, some might not; the overall FLUSH
-	// operation is successful only if all previously-dirty blocks are marked clean
+	// operation is successful only if all CWBs were successful
 	err = mark_blocks_clean();
 	rwsem.up_write();