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

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Date:	Fri, 20 Jul 2007 00:48:29 +0800
From:	"rae l" <crquan@...il.com>
To:	"Paul Clements" <paul.clements@...eleye.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>,
	debra <chdebra@...il.com>
Subject: Re: [PATCH 1/2] nbd: use list_for_each_entry_safe to make it more consolidated and readable

On 7/19/07, rae l <crquan@...il.com> wrote:
> On 7/19/07, Paul Clements <paul.clements@...eleye.com> wrote:
> > 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.
> Sure. I just use the name "n" as in the declaration of
> list_for_each_entry_safe in the header file <linux/list.h>
> I'll resend it a little later.

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, *tmp;
 	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, tmp, &lo->queue_head, queuelist) {
 		if (req != xreq)
 			continue;
 		list_del_init(&req->queuelist);

-- 
Denis Cheng
Linux Application Developer

"One of my most productive days was throwing away 1000 lines of code."
 - Ken Thompson.
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