linux-kernel - Re: [PATCH 2/4] tun: Use iovec iterators

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Date:	Wed, 05 Nov 2014 11:49:16 +0900
From:	YOSHIFUJI Hideaki <hideaki.yoshifuji@...aclelinux.com>
To:	Herbert Xu <herbert@...dor.apana.org.au>,
	Al Viro <viro@...IV.linux.org.uk>,
	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Benjamin LaHaise <bcrl@...ck.org>
CC:	hideaki.yoshifuji@...aclelinux.com
Subject: Re: [PATCH 2/4] tun: Use iovec iterators

Hi,

Herbert Xu wrote:
> Oops, this patch had a left-over skb_pull which made it broken.
> Here is a fixed version.
>
> tun: Use iovec iterators
>
> This patch removes the use of skb_copy_datagram_const_iovec in
> favour of the iovec iterator-based skb_copy_datagram_iter.
>
> Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
>
> diff --git a/drivers/net/tun.c b/drivers/net/tun.c
> index 9dd3746..ff955cdb 100644
> --- a/drivers/net/tun.c
> +++ b/drivers/net/tun.c
:
> @@ -1244,23 +1245,25 @@ static ssize_t tun_put_user(struct tun_struct *tun,
>   	if (tun->flags & TUN_VNET_HDR)
>   		vnet_hdr_sz = tun->vnet_hdr_sz;
>
> +	total = skb->len + vlan_hlen + vnet_hdr_sz;
> +
>   	if (!(tun->flags & TUN_NO_PI)) {
> -		if ((len -= sizeof(pi)) < 0)
> +		if (iov_iter_count(iter) < sizeof(pi))
>   			return -EINVAL;
>
> -		if (len < skb->len + vlan_hlen + vnet_hdr_sz) {
> +		if (iov_iter_count(iter) < total) {

I guess this should be: sizeof(pi) + total

-- 
Hideaki Yoshifuji <hideaki.yoshifuji@...aclelinux.com>
Technical Division, MIRACLE LINUX CORPORATION
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