linux-kernel - Re: [PATCH] staging: rtl8712: Use ether_addr

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Date:	Sun, 17 May 2015 19:09:44 -0500
From:	Larry Finger <Larry.Finger@...inger.net>
To:	Jagan Teki <jteki@...nedev.com>, linux-kernel@...r.kernel.org
CC:	devel@...verdev.osuosl.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Florian Schilhabel <florian.c.schilhabel@...glemail.com>
Subject: Re: [PATCH] staging: rtl8712: Use ether_addr_copy() instead of memcpy()

On 05/17/2015 03:57 PM, Jagan Teki wrote:
> This patch fixes to use ether_addr_copy() instead of memcpy()
>
> Encounter this by applying checkpatch.pl against this file:
>    WARNING: Prefer ether_addr_copy() over memcpy()
>    if the Ethernet addresses are __aligned(2)
>
> Signed-off-by: Jagan Teki <jteki@...nedev.com>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: Larry Finger <Larry.Finger@...inger.net>
> Cc: Florian Schilhabel <florian.c.schilhabel@...glemail.com>
> ---

Can you assure us that you have carefully checked the the source address of 
addr->sa_data and padapter->eeprompriv.mac_addr are suitably aligned? At a 
minimum, have you tested this change on real hardware?

Larry


>   drivers/staging/rtl8712/os_intfs.c | 10 +++++-----
>   1 file changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/staging/rtl8712/os_intfs.c b/drivers/staging/rtl8712/os_intfs.c
> index 6e776e5..0d27df6 100644
> --- a/drivers/staging/rtl8712/os_intfs.c
> +++ b/drivers/staging/rtl8712/os_intfs.c
> @@ -181,7 +181,7 @@ static int r871x_net_set_mac_address(struct net_device *pnetdev, void *p)
>   	struct sockaddr *addr = p;
>
>   	if (padapter->bup == false)
> -		memcpy(pnetdev->dev_addr, addr->sa_data, ETH_ALEN);
> +		ether_addr_copy(pnetdev->dev_addr, addr->sa_data);
>   	return 0;
>   }
>
> @@ -395,8 +395,8 @@ static int netdev_open(struct net_device *pnetdev)
>   			goto netdev_open_error;
>   		if (r8712_initmac == NULL)
>   			/* Use the mac address stored in the Efuse */
> -			memcpy(pnetdev->dev_addr,
> -				padapter->eeprompriv.mac_addr, ETH_ALEN);
> +			ether_addr_copy(pnetdev->dev_addr,
> +					padapter->eeprompriv.mac_addr);
>   		else {
>   			/* We have to inform f/w to use user-supplied MAC
>   			 * address.
> @@ -412,8 +412,8 @@ static int netdev_open(struct net_device *pnetdev)
>   			 * the eeprompriv.mac_addr should store the mac which
>   			 * users specify.
>   			 */
> -			memcpy(padapter->eeprompriv.mac_addr,
> -				pnetdev->dev_addr, ETH_ALEN);
> +			ether_addr_copy(padapter->eeprompriv.mac_addr,
> +					pnetdev->dev_addr);
>   		}
>   		if (start_drv_threads(padapter) != _SUCCESS)
>   			goto netdev_open_error;
>

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