diff --git a/fs/jfs/jfs_imap.c b/fs/jfs/jfs_imap.c
index a360b24ed320..1f47c6e5456b 100644
--- a/fs/jfs/jfs_imap.c
+++ b/fs/jfs/jfs_imap.c
@@ -2594,7 +2594,9 @@ diNewIAG(struct inomap * imap, int *iagnop, int agno, struct metapage ** mpp)
 		txEnd(tid);
 		mutex_unlock(&JFS_IP(ipimap)->commit_mutex);
 
+		AG_UNLOCK(imap, agno);
 		duplicateIXtree(sb, blkno, xlen, &xaddr);
+		AG_LOCK(imap, agno);
 
 		/* update the next available iag number */
 		imap->im_nextiag += 1;