From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751431AbbIFCPZ (ORCPT ); Sat, 5 Sep 2015 22:15:25 -0400 Received: from mail-qg0-f42.google.com ([209.85.192.42]:35619 "EHLO mail-qg0-f42.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750897AbbIFCPU (ORCPT ); Sat, 5 Sep 2015 22:15:20 -0400 From: =?UTF-8?q?Rapha=C3=ABl=20Beamonte?= To: Greg Kroah-Hartman Cc: =?UTF-8?q?Rapha=C3=ABl=20Beamonte?= , Cristina Opriceana , Aya Mahfouz , Luis de Bethencourt , Koray Gulcu , devel@driverdev.osuosl.org, linux-kernel@vger.kernel.org Subject: [PATCHv2] staging: rtl8192u: r8192U_core: fix use ether_addr_copy() over memcpy() code style issue Date: Sat, 5 Sep 2015 22:15:12 -0400 Message-Id: <4deec87c981bbbf81114b49262df0b1b03d98e57.1441505656.git.raphael.beamonte@gmail.com> X-Mailer: git-send-email 2.5.1 In-Reply-To: <20150906004426.GA10760@kroah.com> References: <20150906004426.GA10760@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Prefer ether_addr_copy() over memcpy() if the Ethernet addresses are __aligned(2) The values used are stored as dev_addr in net_device (declared in include/linux/netdevice.h) and sa_data in sockaddr (declared in include/linux/socket.h). Both these elements are u16 aligned as shown by using pahole (position must be a multiple of sizeof(u16)): unsigned char * dev_addr; /* 888 8 */ char sa_data[14]; /* 2 14 */ It is thus safe to use ether_addr_copy() instead of memcpy() for that call, as it is already done in multiple files in the Linux kernel sources: drivers/net/ethernet/broadcom/genet/bcmgenet.c drivers/net/ethernet/brocade/bna/bnad.c drivers/net/ethernet/emulex/benet/be_main.c drivers/net/ethernet/ezchip/nps_enet.c drivers/net/ethernet/ibm/ibmveth.c drivers/net/ethernet/intel/fm10k/fm10k_netdev.c drivers/net/ethernet/intel/i40e/i40e_main.c drivers/net/ethernet/mellanox/mlx5/core/en_main.c drivers/net/usb/lan78xx.c net/8021q/vlan_dev.c net/batman-adv/soft-interface.c net/dsa/slave.c Signed-off-by: Raphaël Beamonte --- drivers/staging/rtl8192u/r8192U_core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/staging/rtl8192u/r8192U_core.c b/drivers/staging/rtl8192u/r8192U_core.c index 76255cb..b143b36 100644 --- a/drivers/staging/rtl8192u/r8192U_core.c +++ b/drivers/staging/rtl8192u/r8192U_core.c @@ -3469,7 +3469,7 @@ static int r8192_set_mac_adr(struct net_device *dev, void *mac) down(&priv->wx_sem); - memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN); + ether_addr_copy(dev->dev_addr, addr->sa_data); schedule_work(&priv->reset_wq); up(&priv->wx_sem); -- 2.5.1