linux-kernel - [PATCH 3.16 105/328] mac802154: tx: cleanup crc calculation

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Date:   Sun, 09 Dec 2018 21:50:33 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Marcel Holtmann" <marcel@...tmann.org>,
        "Alexander Aring" <alex.aring@...il.com>
Subject: [PATCH 3.16 105/328] mac802154: tx: cleanup crc calculation

3.16.62-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Alexander Aring <alex.aring@...il.com>

commit b7eec52bcb7ab93a8cce0f718f42fa17d6d91745 upstream.

Signed-off-by: Alexander Aring <alex.aring@...il.com>
Signed-off-by: Marcel Holtmann <marcel@...tmann.org>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
--- a/net/mac802154/tx.c
+++ b/net/mac802154/tx.c
@@ -95,10 +95,9 @@ netdev_tx_t mac802154_tx(struct mac80215
 	mac802154_monitors_rx(mac802154_to_priv(&priv->hw), skb);
 
 	if (!(priv->hw.flags & IEEE802154_HW_OMIT_CKSUM)) {
-		u16 crc = crc_ccitt(0, skb->data, skb->len);
-		u8 *data = skb_put(skb, 2);
-		data[0] = crc & 0xff;
-		data[1] = crc >> 8;
+		__le16 crc = cpu_to_le16(crc_ccitt(0, skb->data, skb->len));
+
+		memcpy(skb_put(skb, 2), &crc, 2);
 	}
 
 	if (skb_cow_head(skb, priv->hw.extra_tx_headroom))