From: Jakub Kicinski <kuba@kernel.org>
Date: Thu, 21 Oct 2021 06:12:11 -0700
Subject: net: s390: constify and use eth_hw_addr_set()
Git-commit: 978bb0ae8b83097b2889f19907d2b519528ef235
Patch-mainline: v5.16-rc1
References: jsc#PED-594 LTC#198619

Commit 406f42fa0d3c ("net-next: When a bond have a massive amount
of VLANs...") introduced a rbtree for faster Ethernet address look
up. To maintain netdev->dev_addr in this tree we need to make all
the writes to it got through appropriate helpers.

Make sure local references to netdev->dev_addr are constant.

Acked-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/s390/net/lcs.c            |    2 +-
 drivers/s390/net/qeth_core_main.c |    4 ++--
 drivers/s390/net/qeth_l2_main.c   |    6 +++---
 drivers/s390/net/qeth_l3_main.c   |    3 +--
 4 files changed, 7 insertions(+), 8 deletions(-)

--- a/drivers/s390/net/lcs.c
+++ b/drivers/s390/net/lcs.c
@@ -2162,7 +2162,7 @@ lcs_new_device(struct ccwgroup_device *c
 	card->dev->ml_priv = card;
 	card->dev->netdev_ops = &lcs_netdev_ops;
 	card->dev->dev_port = card->portno;
-	memcpy(card->dev->dev_addr, card->mac, LCS_MAC_LENGTH);
+	eth_hw_addr_set(card->dev, card->mac);
 #ifdef CONFIG_IP_MULTICAST
 	if (!lcs_check_multicast_support(card))
 		card->dev->netdev_ops = &lcs_mc_netdev_ops;
--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -4400,7 +4400,7 @@ static int qeth_setadpparms_change_macad
 	    !(adp_cmd->hdr.flags & QETH_SETADP_FLAGS_VIRTUAL_MAC))
 		return -EADDRNOTAVAIL;
 
-	ether_addr_copy(card->dev->dev_addr, adp_cmd->data.change_addr.addr);
+	eth_hw_addr_set(card->dev, adp_cmd->data.change_addr.addr);
 	return 0;
 }
 
@@ -5072,7 +5072,7 @@ int qeth_vm_request_mac(struct qeth_card
 		QETH_CARD_TEXT(card, 2, "badmac");
 		QETH_CARD_HEX(card, 2, response->mac, ETH_ALEN);
 	} else {
-		ether_addr_copy(card->dev->dev_addr, response->mac);
+		eth_hw_addr_set(card->dev, response->mac);
 	}
 
 out:
--- a/drivers/s390/net/qeth_l2_main.c
+++ b/drivers/s390/net/qeth_l2_main.c
@@ -71,7 +71,7 @@ static int qeth_l2_send_setdelmac_cb(str
 	return qeth_l2_setdelmac_makerc(card, cmd->hdr.return_code);
 }
 
-static int qeth_l2_send_setdelmac(struct qeth_card *card, __u8 *mac,
+static int qeth_l2_send_setdelmac(struct qeth_card *card, const __u8 *mac,
 			   enum qeth_ipa_cmds ipacmd)
 {
 	struct qeth_ipa_cmd *cmd;
@@ -88,7 +88,7 @@ static int qeth_l2_send_setdelmac(struct
 	return qeth_send_ipa_cmd(card, iob, qeth_l2_send_setdelmac_cb, NULL);
 }
 
-static int qeth_l2_send_setmac(struct qeth_card *card, __u8 *mac)
+static int qeth_l2_send_setmac(struct qeth_card *card, const __u8 *mac)
 {
 	int rc;
 
@@ -378,7 +378,7 @@ static int qeth_l2_set_mac_address(struc
 	if (rc)
 		return rc;
 	ether_addr_copy(old_addr, dev->dev_addr);
-	ether_addr_copy(dev->dev_addr, addr->sa_data);
+	eth_hw_addr_set(dev, addr->sa_data);
 
 	if (card->info.dev_addr_is_registered)
 		qeth_l2_remove_mac(card, old_addr);
--- a/drivers/s390/net/qeth_l3_main.c
+++ b/drivers/s390/net/qeth_l3_main.c
@@ -913,8 +913,7 @@ static int qeth_l3_iqd_read_initial_mac_
 	if (!is_valid_ether_addr(cmd->data.create_destroy_addr.mac_addr))
 		return -EADDRNOTAVAIL;
 
-	ether_addr_copy(card->dev->dev_addr,
-			cmd->data.create_destroy_addr.mac_addr);
+	eth_hw_addr_set(card->dev, cmd->data.create_destroy_addr.mac_addr);
 	return 0;
 }