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r8169: Avoid pointer aliasing 

Read MAC address 32-bit at a time and manually extract the individual
bytes. This avoids pointer aliasing and gives the compiler a better
chance of optimizing the operation.

Suggested-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Thierry Reding 2019-02-06 13:30:18 +01:00 committed by David S. Miller
parent 04c7788c2b
commit deedf1feb2
1 changed files with 13 additions and 3 deletions
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16
drivers/net/ethernet/realtek/r8169.c
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@ -7113,12 +7113,21 @@ static int rtl_alloc_irq(struct rtl8169_private *tp)
static void rtl_read_mac_address(struct rtl8169_private *tp,
u8 mac_addr[ETH_ALEN])
{
u32 value;
/* Get MAC address */
switch (tp->mac_version) {
case RTL_GIGA_MAC_VER_35 ... RTL_GIGA_MAC_VER_38:
case RTL_GIGA_MAC_VER_40 ... RTL_GIGA_MAC_VER_51:
*(u32 *)&mac_addr[0] = rtl_eri_read(tp, 0xe0, ERIAR_EXGMAC);
*(u16 *)&mac_addr[4] = rtl_eri_read(tp, 0xe4, ERIAR_EXGMAC);
value = rtl_eri_read(tp, 0xe0, ERIAR_EXGMAC);
mac_addr[0] = (value >> 0) & 0xff;
mac_addr[1] = (value >> 8) & 0xff;
mac_addr[2] = (value >> 16) & 0xff;
mac_addr[3] = (value >> 24) & 0xff;
value = rtl_eri_read(tp, 0xe4, ERIAR_EXGMAC);
mac_addr[4] = (value >> 0) & 0xff;
mac_addr[5] = (value >> 8) & 0xff;
break;
default:
break;
@ -7316,7 +7325,8 @@ static int rtl_get_ether_clk(struct rtl8169_private *tp)
static int rtl_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
{
const struct rtl_cfg_info *cfg = rtl_cfg_infos + ent->driver_data;
u8 mac_addr[ETH_ALEN] __aligned(4) = {};
/* align to u16 for is_valid_ether_addr() */
u8 mac_addr[ETH_ALEN] __aligned(2) = {};
struct rtl8169_private *tp;
struct net_device *dev;
int chipset, region, i;