linux-kernel - Re: [PATCH] usb driver for intellon based PLC like devolo dlan duo

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Date:	Sat, 18 Apr 2009 09:16:28 +0200 (CEST)
From:	"Peter Holik" <peter@...ik.at>
To:	"Oliver Neukum" <oliver@...kum.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] usb driver for intellon based PLC like devolo dlan duo

> Am Freitag 17 April 2009 16:10:24 schrieb Peter Holik:
>
> +static int intellon_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
> +{
> +       int len;
> +
> +       if (unlikely(skb->len < INTELLON_HEADER_SIZE)) {
> +               deverr(dev, "unexpected tiny rx frame");
> +               return 0;
> +       }
> +
> +       len = (skb->data[skb->len - 2] | (skb->data[skb->len - 1] << 8));
>
> Please use a conversion function.

do you mean

len = le16_to_cpu(skb->data[skb->len - 2] | (skb->data[skb->len - 1] << 8));

> +       } else {
> +               struct sk_buff *skb2;
> +
> +               skb2 = skb_copy_expand(skb,
> +                               INTELLON_HEADER_SIZE,
> +                               need_tail,
> +                               flags);
> +               dev_kfree_skb_any(skb);
> +               if (!skb2)
> +                       return skb2;
>
> If you return NULL in an error case, write it so explicitely.

ok

> +       __skb_push(skb, INTELLON_HEADER_SIZE);
> +
> +       skb->data[0] = pack_len & 0xFF;
> +       skb->data[1] = (pack_len & 0x700) >> 8;
>
> Again, a conversion function is called for.

is this correct

  __le16 *len;
.
.
.
  pack_len &= 0x07ff;

  len = (__le16 *) __skb_push(skb, INT51X1_HEADER_SIZE);
  *len = cpu_to_le16(pack_len);


cu Peter

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