linux-kernel - Re: [PATCH 1/2] nbd: use list_for_each_entry_safe to make it more consolidated and readable

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Message-ID: <469F7F58.4080709@steeleye.com>
Date:	Thu, 19 Jul 2007 11:12:24 -0400
From:	Paul Clements <paul.clements@...eleye.com>
To:	Denis Cheng <crquan@...il.com>
CC:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Pavel Machek <pavel@....cz>,
	Steven Whitehouse <steve@...gwyn.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 1/2] nbd: use list_for_each_entry_safe to make it more
 consolidated and readable

Denis Cheng wrote:
> Thus the traverse of the loop may delete nodes, use the safe version.
> 
> Signed-off-by: Denis Cheng <crquan@...il.com>
> ---
>  drivers/block/nbd.c |    6 ++----
>  1 files changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
> index c129510..86639c0 100644
> --- a/drivers/block/nbd.c
> +++ b/drivers/block/nbd.c
> @@ -237,8 +237,7 @@ error_out:
>  
>  static struct request *nbd_find_request(struct nbd_device *lo, char *handle)
>  {
> -	struct request *req;
> -	struct list_head *tmp;
> +	struct request *req, *n;
>  	struct request *xreq;
>  	int err;
>  
> @@ -249,8 +248,7 @@ static struct request *nbd_find_request(struct nbd_device *lo, char *handle)
>  		goto out;
>  
>  	spin_lock(&lo->queue_lock);
> -	list_for_each(tmp, &lo->queue_head) {
> -		req = list_entry(tmp, struct request, queuelist);
> +	list_for_each_entry_safe(req, n, &lo->queue_head, queuelist) {
>  		if (req != xreq)
>  			continue;
>  		list_del_init(&req->queuelist);

Could you name "n" as "tmp" (as in the previous code) so that it's clear 
that's only a temporary variable. Other than that, this looks good.

Thanks,
Paul
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