From: Raju Rangoju <rajur@chelsio.com>
Date: Wed, 18 Nov 2020 20:02:13 +0530
Subject: cxgb4: fix the panic caused by non smac rewrite
Patch-mainline: v5.10-rc6
Git-commit: bff453921ae105a8dbbad0ed7dd5f5ce424536e7
References: bsc#1064802 bsc#1066129

SMT entry is allocated only when loopback Source MAC
rewriting is requested. Accessing SMT entry for non
smac rewrite cases results in kernel panic.

Fix the panic caused by non smac rewrite

Fixes: 937d84205884 ("cxgb4: set up filter action after rewrites")
Signed-off-by: Raju Rangoju <rajur@chelsio.com>
Link: https://lore.kernel.org/r/20201118143213.13319-1-rajur@chelsio.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/chelsio/cxgb4/cxgb4_filter.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_filter.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_filter.c
@@ -626,7 +626,8 @@ int set_filter_wr(struct adapter *adapte
 		 FW_FILTER_WR_OVLAN_VLD_V(f->fs.val.ovlan_vld) |
 		 FW_FILTER_WR_IVLAN_VLDM_V(f->fs.mask.ivlan_vld) |
 		 FW_FILTER_WR_OVLAN_VLDM_V(f->fs.mask.ovlan_vld));
-	fwr->smac_sel = f->smt->idx;
+	if (f->fs.newsmac)
+		fwr->smac_sel = f->smt->idx;
 	fwr->rx_chan_rx_rpl_iq =
 		htons(FW_FILTER_WR_RX_CHAN_V(0) |
 		      FW_FILTER_WR_RX_RPL_IQ_V(adapter->sge.fw_evtq.abs_id));