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gianfar: Make MAC addr setup endian safe, cleanup

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Fix the 32-bit memory access that is not endian safe,
i.e. not giving the desired byte layout for a LE CPU:
tempval = *((u32 *) (tmpbuf + 4)), where 'char tmpbuf[]'.

Get rid of rendundant local vars (tmpbuf[] and idx) and
forced casts.  Cleanup comments.

Signed-off-by: Claudiu Manoil <claudiu.manoil@freescale.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Claudiu Manoil 2014-10-07 10:44:33 +03:00 committed by David S. Miller
parent d6ef0bcce3
commit 83bfc3c476
1 changed files with 7 additions and 8 deletions
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15
drivers/net/ethernet/freescale/gianfar.c
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@ -3248,22 +3248,21 @@ static void gfar_set_mac_for_addr(struct net_device *dev, int num,
{
struct gfar_private *priv = netdev_priv(dev);
struct gfar __iomem *regs = priv->gfargrp[0].regs;
int idx;
char tmpbuf[ETH_ALEN];
u32 tempval;
u32 __iomem *macptr = &regs->macstnaddr1;
macptr += num*2;
/* Now copy it into the mac registers backwards, cuz
* little endian is silly
/* For a station address of 0x12345678ABCD in transmission
* order (BE), MACnADDR1 is set to 0xCDAB7856 and
* MACnADDR2 is set to 0x34120000.
*/
for (idx = 0; idx < ETH_ALEN; idx++)
tmpbuf[ETH_ALEN - 1 - idx] = addr[idx];
tempval = (addr[5] << 24) | (addr[4] << 16) |
(addr[3] << 8) | addr[2];
gfar_write(macptr, *((u32 *) (tmpbuf)));
gfar_write(macptr, tempval);
tempval = *((u32 *) (tmpbuf + 4));
tempval = (addr[1] << 24) | (addr[0] << 16);
gfar_write(macptr+1, tempval);
}