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ravb: read MAC address registers only once

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The code reading the MAHR/MALR registers in ravb_read_mac_address() is
terribly ineffective -- it reads  MAHR 4 times and MALR 2 times, while
it's enough to read each register only once. Use the local variables to
achieve that, somewhat beautifying the code while at it...

Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Sergei Shtylyov 2015-12-05 00:58:07 +03:00 committed by David S. Miller
parent 04f96468f7
commit d966063897
1 changed files with 9 additions and 6 deletions
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15
drivers/net/ethernet/renesas/ravb_main.c
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@ -115,12 +115,15 @@ static void ravb_read_mac_address(struct net_device *ndev, const u8 *mac)
if (mac) {
ether_addr_copy(ndev->dev_addr, mac);
} else {
ndev->dev_addr[0] = (ravb_read(ndev, MAHR) >> 24);
ndev->dev_addr[1] = (ravb_read(ndev, MAHR) >> 16) & 0xFF;
ndev->dev_addr[2] = (ravb_read(ndev, MAHR) >> 8) & 0xFF;
ndev->dev_addr[3] = (ravb_read(ndev, MAHR) >> 0) & 0xFF;
ndev->dev_addr[4] = (ravb_read(ndev, MALR) >> 8) & 0xFF;
ndev->dev_addr[5] = (ravb_read(ndev, MALR) >> 0) & 0xFF;
u32 mahr = ravb_read(ndev, MAHR);
u32 malr = ravb_read(ndev, MALR);
ndev->dev_addr[0] = (mahr >> 24) & 0xFF;
ndev->dev_addr[1] = (mahr >> 16) & 0xFF;
ndev->dev_addr[2] = (mahr >> 8) & 0xFF;
ndev->dev_addr[3] = (mahr >> 0) & 0xFF;
ndev->dev_addr[4] = (malr >> 8) & 0xFF;
ndev->dev_addr[5] = (malr >> 0) & 0xFF;
}
}