struct switchtec_ntb *sndev)
 				       sndev->mmio_self_ctrl);
 
 	sndev->nr_lut_mw = ioread16(&sndev->mmio_self_ctrl->lut_table_entries);
-	sndev->nr_lut_mw = rounddown_pow_of_two(sndev->nr_lut_mw);
+	if (sndev->nr_lut_mw)
+		sndev->nr_lut_mw = rounddown_pow_of_two(sndev->nr_lut_mw);
 
 	dev_dbg(&sndev->stdev->dev, "MWs: %d direct, %d lut\n",
 		sndev->nr_direct_mw, sndev->nr_lut_mw);
@@ -1212,7 +1213,8 @@ static void switchtec_ntb_init_mw(struct switchtec_ntb *sndev)
 
 	sndev->peer_nr_lut_mw =
 		ioread16(&sndev->mmio_peer_ctrl->lut_table_entries);
-	sndev->peer_nr_lut_mw = rounddown_pow_of_two(sndev->peer_nr_lut_mw);
+	if (sndev->peer_nr_lut_mw)
+		sndev->peer_nr_lut_mw = rounddown_pow_of_two(sndev->peer_nr_lut_mw);
 
 	dev_dbg(&sndev->stdev->dev, "Peer MWs: %d direct, %d lut\n",
 		sndev->peer_nr_direct_mw, sndev->peer_nr_lut_mw);
-- 
2.51.0[PATCH 6.19 445/844] ntb: ntb_hw_switchtec: Fix shift-out-of-bounds for 0 mw lutSasha Levin <sashal@kernel.org> undefinedlinux-kernel@vger.kernel.org, stable@vger.kernel.org undefined undefined undefined undefined·J†¨.