linux-kernel - Re: [PATCH v3] staging: rtl8712: Use ether_addr

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Date:	Thu, 21 May 2015 00:11:46 +0530
From:	Jagan Teki <jteki@...nedev.com>
To:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Cc:	devel@...verdev.osuosl.org,
	Florian Schilhabel <florian.c.schilhabel@...glemail.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Dan Carpenter <dan.carpenter@...cle.com>,
	Larry Finger <Larry.Finger@...inger.net>
Subject: Re: [PATCH v3] staging: rtl8712: Use ether_addr_copy() instead of memcpy()

On 18 May 2015 at 22:02, Jagan Teki <jteki@...nedev.com> wrote:
> Fixes Warning encounter this by applying checkpatch.pl against this file:
> Prefer ether_addr_copy() over memcpy() if the Ethernet addresses
> are __aligned(2)
>
> pahole output for respective structures:
> - addr->sa_data
> struct sockaddr {
>         sa_family_t                sa_family;            /*     0     2 */
>         char                       sa_data[14];          /*     2    14 */
>
>         /* size: 16, cachelines: 1, members: 2 */
>         /* last cacheline: 16 bytes */
> };
>
> - pnetdev->dev_addr
> dev_addr is interface address infor from generic net_device structure
> which is properly aligned and have some patches with this change as well.
> "staging: rtl8712: fix Prefer ether_addr_copy() over memcpy()"
> (sha1: 36e4d8826b317080e283e4edd08bf8d5ac706f38)
>
> 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>
> ---
> Changes for v3:
>         - Removed unaligned conversions
> Changes for v2:
>         - Describe a changelog, to prove address are aligned
>
>  drivers/staging/rtl8712/os_intfs.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/staging/rtl8712/os_intfs.c b/drivers/staging/rtl8712/os_intfs.c
> index 6e776e5..d5f4c4d 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;
>  }
>
> --

Ping!
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