From: Jakub Kicinski <kuba@kernel.org>
Date: Thu, 21 Oct 2021 06:12:05 -0700
Subject: net: qmi_wwan: use dev_addr_mod()
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Patch-mainline: v5.16-rc1
Git-commit: 18867486fea3f9439c4c7e66e92146bd6bf3de85
References: jsc#PED-1565

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.

Acked-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/usb/qmi_wwan.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

--- a/drivers/net/usb/qmi_wwan.c
+++ b/drivers/net/usb/qmi_wwan.c
@@ -835,8 +835,11 @@ static int qmi_wwan_bind(struct usbnet *
 
 	/* make MAC addr easily distinguishable from an IP header */
 	if (possibly_iphdr(dev->net->dev_addr)) {
-		dev->net->dev_addr[0] |= 0x02;	/* set local assignment bit */
-		dev->net->dev_addr[0] &= 0xbf;	/* clear "IP" bit */
+		u8 addr = dev->net->dev_addr[0];
+
+		addr |= 0x02;	/* set local assignment bit */
+		addr &= 0xbf;	/* clear "IP" bit */
+		dev_addr_mod(dev->net, 0, &addr, 1);
 	}
 	dev->net->netdev_ops = &qmi_wwan_netdev_ops;
 	dev->net->sysfs_groups[0] = &qmi_wwan_sysfs_attr_group;