diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index a64aa56..b210446 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -363,9 +363,8 @@
  * Must be called while holding tbl->slot_tbl_lock
  */
 static void
-nfs4_free_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *free_slot)
+nfs4_free_slot(struct nfs4_slot_table *tbl, u8 free_slotid)
 {
-	int free_slotid = free_slot - tbl->slots;
 	int slotid = free_slotid;
 
 	BUG_ON(slotid < 0 || slotid >= NFS4_MAX_SLOT_TABLE);
@@ -430,7 +429,7 @@
 	}
 
 	spin_lock(&tbl->slot_tbl_lock);
-	nfs4_free_slot(tbl, res->sr_slot);
+	nfs4_free_slot(tbl, res->sr_slot - tbl->slots);
 	nfs4_check_drain_fc_complete(res->sr_session);
 	spin_unlock(&tbl->slot_tbl_lock);
 	res->sr_slot = NULL;