net/rds: Set fr_state only to FRMR_IS_FREE if IB_WR_LOCAL_INV had been successful

Fix a bug where fr_state first goes to FRMR_IS_STALE, because of a failure
of operation IB_WR_LOCAL_INV, but then gets set back to "FRMR_IS_FREE"
uncoditionally, even though the operation failed.
Signed-off-by: Gerd Rausch <gerd.rausch@oracle.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/rds/ib_frmr.c

@@ -309,7 +309,8 @@ void rds_ib_mr_cqe_handler(struct rds_ib_connection *ic, struct ib_wc *wc)
 	}
 
 	if (frmr->fr_inv) {
-		frmr->fr_state = FRMR_IS_FREE;
+		if (frmr->fr_state == FRMR_IS_INUSE)
+			frmr->fr_state = FRMR_IS_FREE;
 		frmr->fr_inv = false;
 		wake_up(&frmr->fr_inv_done);
 	}