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wctc4xxp: Use __dev_addr_set() on kernels >= 5.15

The address list has been converted to a tree, so netdev->dev_addr
is now const and must not be written directly.  The __dev_addr_set
helper can be used for this.

Change-Id: Id7b71164dfe7772b68e86cb12ac0e0974fec1498
---
M drivers/dahdi/wctc4xxp/base.c
1 file changed, 4 insertions(+), 0 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/dahdi-linux refs/changes/11/27911/1

diff --git a/drivers/dahdi/wctc4xxp/base.c b/drivers/dahdi/wctc4xxp/base.c
index 7ff3456..223bbbd 100644
--- a/drivers/dahdi/wctc4xxp/base.c
+++ b/drivers/dahdi/wctc4xxp/base.c
@@ -637,7 +637,11 @@
 		return -ENOMEM;
 	priv = netdev_priv(netdev);
 	priv->wc = wc;
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 15, 0)
+	__dev_addr_set(netdev, our_mac, sizeof(our_mac));
+#else
 	memcpy(netdev->dev_addr, our_mac, sizeof(our_mac));
+#endif
 
 #	ifdef HAVE_NET_DEVICE_OPS
 	netdev->netdev_ops = &wctc4xxp_netdev_ops;

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