linux-kernel - Re: [PATCH v3 01/33] staging: rtl8192e: Declare ethernet addresses as _

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Date:	Sat, 09 May 2015 15:29:32 -0700
From:	Joe Perches <joe@...ches.com>
To:	Mateusz Kulikowski <mateusz.kulikowski@...il.com>
Cc:	gregkh@...uxfoundation.org, dan.carpenter@...cle.com,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 01/33] staging: rtl8192e: Declare ethernet addresses
 as __aligned(2)

On Sat, 2015-05-09 at 23:18 +0200, Mateusz Kulikowski wrote:
> Add __aligned(2) into ethernet addresses allocated on stack or in non-packed
> structures. Use ETH_ALEN as array length in places where it was hardcoded to 6.
[]
> diff --git a/drivers/staging/rtl8192e/rtl8192e/r8192E_dev.c b/drivers/staging/rtl8192e/rtl8192e/r8192E_dev.c
[]
> @@ -321,7 +321,8 @@ static void rtl8192_read_eeprom_info(struct net_device *dev)
>  	u8 ICVer8192, ICVer8256;
>  	u16 i, usValue, IC_Version;
>  	u16 EEPROMId;
> -	u8 bMac_Tmp_Addr[6] = {0x00, 0xe0, 0x4c, 0x00, 0x00, 0x01};
> +	u8 bMac_Tmp_Addr[ETH_ALEN] __aligned(2) = {0x00, 0xe0, 0x4c,
> +						   0x00, 0x00, 0x01};

While this is safe, as this follows a u16, it's unnecessary.

Also, ideally, this would be
	u8 foo[ETH_ALEN] = {
		1, 2, 3, 4, 5, 6
	};
or just left on a single line.

> diff --git a/drivers/staging/rtl8192e/rtl8192e/rtl_core.c b/drivers/staging/rtl8192e/rtl8192e/rtl_core.c
[]
> @@ -2573,8 +2573,9 @@ static int rtl8192_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
>  	int ret = -1;
>  	struct rtllib_device *ieee = priv->rtllib;
>  	u32 key[4];
> -	u8 broadcast_addr[6] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
> -	u8 zero_addr[6] = {0};
> +	u8 broadcast_addr[ETH_ALEN] __aligned(2) = {0xff, 0xff, 0xff,
> +						    0xff, 0xff, 0xff};
> +	u8 zero_addr[ETH_ALEN] __aligned(2) = {0};

If these are used only in tests, these are probably better
being removed and using is_<foo>_ether_addr or maybe
if these used in things other than tests, being converted
to static const so they are not reinitialized on each
call of the function.

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