netdev - Re: [PATCH] drivers/net/usb/asix: resync from vendor's copy

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Date:	Wed, 9 Nov 2011 17:31:51 +0000
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Mark Lord <kernel@...savvy.com>
CC:	David Miller <davem@...emloft.net>, <netdev@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drivers/net/usb/asix:  resync from vendor's copy

On Wed, 2011-11-09 at 12:20 -0500, Mark Lord wrote:
> On 11-11-09 11:57 AM, Mark Lord wrote:
> > 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.
> ..
> 
> Or even simpler (below).  I don't think this method requires any
> extra locking, but I'm still open to persuasion.  :)

Looks reasonable, but...

> 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;
>         u16 tx_csum = 0, rx_csum = 0;
> 
>         priv->features = features & (NETIF_F_HW_CSUM | NETIF_F_RXCSUM);

...why do you need priv->features at all?

Ben.

>         if (features & NETIF_F_HW_CSUM)
>                 tx_csum = AX_TXCOE_DEF_CSUM;
>         if (features & NETIF_F_RXCSUM)
>                 rx_csum = AX_RXCOE_DEF_CSUM;
>         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;
> }
> 

-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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