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SubjectRe: [PATCH] drivers/net/usb/asix: resync from vendor's copy
On 11-11-09 11:47 AM, Mark Lord wrote:
..
> Note: I'm looking at smsc95xx.c and smsc75xx.c for examples,
> and they both have the same problem I'll have here:
>
> How to update the csum settings atomically.
> A spinlock is no good, because config register access is over USB.

Nevermind.. a slight change in the logic and all is well again.

static int ax88772b_set_features(struct net_device *netdev, u32 features)
{
struct usbnet *dev = netdev_priv(netdev);
struct ax88772b_data *priv = (struct ax88772b_data *)dev->driver_priv;
unsigned long flags;
u16 tx_csum = 0, rx_csum = 0;

spin_lock_irqsave(&priv->features_lock, flags);
if (features & NETIF_F_HW_CSUM) {
priv->checksum |= AX_TX_CHECKSUM;
tx_csum = AX_TXCOE_DEF_CSUM;
} else
priv->checksum &= ~AX_TX_CHECKSUM;
if (features & NETIF_F_RXCSUM) {
priv->checksum |= AX_RX_CHECKSUM;
rx_csum = AX_RXCOE_DEF_CSUM;
} else
priv->checksum &= ~AX_RX_CHECKSUM;
spin_unlock_irqrestore(&priv->features_lock, flags);

ax8817x_write_cmd(dev, AX_CMD_WRITE_RXCOE_CTL,
rx_csum, 0, 0, NULL);
ax8817x_write_cmd(dev, AX_CMD_WRITE_TXCOE_CTL,
tx_csum, 0, 0, NULL);
return 0;
}


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