netdev - Re: [PATCH 6/10]: decnet: Use SKB queue and list helpers instead of doing it by-hand.

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Message-Id: <1243593339.29604.515.camel@localhost.localdomain>
Date:	Fri, 29 May 2009 11:35:39 +0100
From:	Steven Whitehouse <swhiteho@...hat.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org, linux-wireless@...r.kernel.org
Subject: Re: [PATCH 6/10]: decnet: Use SKB queue and list helpers instead
 of doing it by-hand.

Hi,

On Fri, 2009-05-29 at 01:40 -0700, David Miller wrote:
> Signed-off-by: David S. Miller <davem@...emloft.net>
Acked-by: Steven Whitehouse <swhiteho@...hat.com>

Steve.

> ---
>  net/decnet/af_decnet.c  |   19 +++++--------------
>  net/decnet/dn_nsp_out.c |    8 ++------
>  2 files changed, 7 insertions(+), 20 deletions(-)
> 
> diff --git a/net/decnet/af_decnet.c b/net/decnet/af_decnet.c
> index 9647d91..bccb388 100644
> --- a/net/decnet/af_decnet.c
> +++ b/net/decnet/af_decnet.c
> @@ -1250,14 +1250,8 @@ static int dn_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
>  		if (skb) {
>  			amount = skb->len;
>  		} else {
> -			skb = sk->sk_receive_queue.next;
> -			for (;;) {
> -				if (skb ==
> -				    (struct sk_buff *)&sk->sk_receive_queue)
> -					break;
> +			skb_queue_walk(&sk->sk_receive_queue, skb)
>  				amount += skb->len;
> -				skb = skb->next;
> -			}
>  		}
>  		release_sock(sk);
>  		err = put_user(amount, (int __user *)arg);
> @@ -1644,13 +1638,13 @@ static int __dn_getsockopt(struct socket *sock, int level,int optname, char __us
>  
>  static int dn_data_ready(struct sock *sk, struct sk_buff_head *q, int flags, int target)
>  {
> -	struct sk_buff *skb = q->next;
> +	struct sk_buff *skb;
>  	int len = 0;
>  
>  	if (flags & MSG_OOB)
>  		return !skb_queue_empty(q) ? 1 : 0;
>  
> -	while(skb != (struct sk_buff *)q) {
> +	skb_queue_walk(q, skb) {
>  		struct dn_skb_cb *cb = DN_SKB_CB(skb);
>  		len += skb->len;
>  
> @@ -1666,8 +1660,6 @@ static int dn_data_ready(struct sock *sk, struct sk_buff_head *q, int flags, int
>  		/* minimum data length for read exceeded */
>  		if (len >= target)
>  			return 1;
> -
> -		skb = skb->next;
>  	}
>  
>  	return 0;
> @@ -1683,7 +1675,7 @@ static int dn_recvmsg(struct kiocb *iocb, struct socket *sock,
>  	size_t target = size > 1 ? 1 : 0;
>  	size_t copied = 0;
>  	int rv = 0;
> -	struct sk_buff *skb, *nskb;
> +	struct sk_buff *skb, *n;
>  	struct dn_skb_cb *cb = NULL;
>  	unsigned char eor = 0;
>  	long timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
> @@ -1758,7 +1750,7 @@ static int dn_recvmsg(struct kiocb *iocb, struct socket *sock,
>  		finish_wait(sk->sk_sleep, &wait);
>  	}
>  
> -	for(skb = queue->next; skb != (struct sk_buff *)queue; skb = nskb) {
> +	skb_queue_walk_safe(queue, skb, n) {
>  		unsigned int chunk = skb->len;
>  		cb = DN_SKB_CB(skb);
>  
> @@ -1775,7 +1767,6 @@ static int dn_recvmsg(struct kiocb *iocb, struct socket *sock,
>  			skb_pull(skb, chunk);
>  
>  		eor = cb->nsp_flags & 0x40;
> -		nskb = skb->next;
>  
>  		if (skb->len == 0) {
>  			skb_unlink(skb, queue);
> diff --git a/net/decnet/dn_nsp_out.c b/net/decnet/dn_nsp_out.c
> index 2013c25..da04f45 100644
> --- a/net/decnet/dn_nsp_out.c
> +++ b/net/decnet/dn_nsp_out.c
> @@ -382,7 +382,7 @@ int dn_nsp_check_xmit_queue(struct sock *sk, struct sk_buff *skb, struct sk_buff
>  {
>  	struct dn_skb_cb *cb = DN_SKB_CB(skb);
>  	struct dn_scp *scp = DN_SK(sk);
> -	struct sk_buff *skb2, *list, *ack = NULL;
> +	struct sk_buff *skb2, *n, *ack = NULL;
>  	int wakeup = 0;
>  	int try_retrans = 0;
>  	unsigned long reftime = cb->stamp;
> @@ -390,9 +390,7 @@ int dn_nsp_check_xmit_queue(struct sock *sk, struct sk_buff *skb, struct sk_buff
>  	unsigned short xmit_count;
>  	unsigned short segnum;
>  
> -	skb2 = q->next;
> -	list = (struct sk_buff *)q;
> -	while(list != skb2) {
> +	skb_queue_walk_safe(q, skb2, n) {
>  		struct dn_skb_cb *cb2 = DN_SKB_CB(skb2);
>  
>  		if (dn_before_or_equal(cb2->segnum, acknum))
> @@ -400,8 +398,6 @@ int dn_nsp_check_xmit_queue(struct sock *sk, struct sk_buff *skb, struct sk_buff
>  
>  		/* printk(KERN_DEBUG "ack: %s %04x %04x\n", ack ? "ACK" : "SKIP", (int)cb2->segnum, (int)acknum); */
>  
> -		skb2 = skb2->next;
> -
>  		if (ack == NULL)
>  			continue;
>  
> -- 
> 1.6.3
> 
> --
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