linux-kernel - [PATCH] staging: vt6656: fix Prefer ether_addr_copy() over memcpy() if the Ethernet addresses are _

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Message-ID: <20150121110848.GA9282@mohammed-Inspiron-3537>
Date:	Wed, 21 Jan 2015 13:08:48 +0200
From:	Heba Aamer <heba93aamer@...il.com>
To:	devel@...verdev.osuosl.org
Cc:	forest@...ttletooquiet.net, gregkh@...uxfoundation.org,
	tvboxspy@...il.com, linux-kernel@...r.kernel.org
Subject: [PATCH] staging: vt6656: fix Prefer ether_addr_copy() over memcpy()
 if the Ethernet addresses are __aligned(2)

This patch fixes the following checkpatch.pl warning:
fix Prefer ether_addr_copy() over memcpy() 
if the Ethernet addresses are __aligned(2)

Pahole showed that the 2 structs are aligned to u16

struct vnt_mic_hdr {
        u8                         id;                   /*     0     1 */
        u8                         tx_priority;          /*     1     1 */
        u8                         mic_addr2[6];         /*     2     6 */
        u8                         ccmp_pn[6];           /*     8     6 */
        __be16                     payload_len;          /*    14     2 */
        __be16                     hlen;                 /*    16     2 */
        __le16                     frame_control;        /*    18     2 */
        u8                         addr1[6];             /*    20     6 */
        u8                         addr2[6];             /*    26     6 */
        u8                         addr3[6];             /*    32     6 */
        __le16                     seq_ctrl;             /*    38     2 */
        u8                         addr4[6];             /*    40     6 */
        u16                        packing;              /*    46     2 */

        /* size: 48, cachelines: 1, members: 13 */
        /* last cacheline: 48 bytes */
};

struct ieee80211_hdr {
        __le16                     frame_control;        /*     0     2 */
        __le16                     duration_id;          /*     2     2 */
        u8                         addr1[6];             /*     4     6 */
        u8                         addr2[6];             /*    10     6 */
        u8                         addr3[6];             /*    16     6 */
        __le16                     seq_ctrl;             /*    22     2 */
        u8                         addr4[6];             /*    24     6 */

        /* size: 30, cachelines: 1, members: 7 */
        /* last cacheline: 30 bytes */
};

Signed-off-by: Heba Aamer <heba93aamer@...il.com>
---
 drivers/staging/vt6656/rxtx.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/vt6656/rxtx.c b/drivers/staging/vt6656/rxtx.c
index bb6a4d4..b74f672 100644
--- a/drivers/staging/vt6656/rxtx.c
+++ b/drivers/staging/vt6656/rxtx.c
@@ -738,7 +738,7 @@ static void vnt_fill_txkey(struct vnt_usb_send_context *tx_context,
 
 		mic_hdr->id = 0x59;
 		mic_hdr->payload_len = cpu_to_be16(payload_len);
-		memcpy(mic_hdr->mic_addr2, hdr->addr2, ETH_ALEN);
+		ether_addr_copy(mic_hdr->mic_addr2, hdr->addr2);
 
 		ieee80211_get_key_tx_seq(tx_key, &seq);
 
-- 
1.7.9.5

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