linux-kernel - [PATCH 1/3] async: simplify lowest_in

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Message-Id: <1363019405-4331-2-git-send-email-laijs@cn.fujitsu.com>
Date:	Tue, 12 Mar 2013 00:30:02 +0800
From:	Lai Jiangshan <laijs@...fujitsu.com>
To:	Tejun Heo <tj@...nel.org>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	linux-kernel@...r.kernel.org
Cc:	Lai Jiangshan <laijs@...fujitsu.com>,
	James Bottomley <JBottomley@...allels.com>,
	Dan Williams <dan.j.williams@...el.com>
Subject: [PATCH 1/3] async: simplify lowest_in_progress()

The code in lowest_in_progress() are duplicated in two branches,
simplify them.

Signed-off-by: Lai Jiangshan <laijs@...fujitsu.com>
Cc: Tejun Heo <tj@...nel.org>
Cc: Arjan van de Ven <arjan@...ux.intel.com>
---
 kernel/async.c |   20 ++++++++------------
 1 files changed, 8 insertions(+), 12 deletions(-)

diff --git a/kernel/async.c b/kernel/async.c
index 8ddee2c..ef66b2f 100644
--- a/kernel/async.c
+++ b/kernel/async.c
@@ -84,24 +84,20 @@ static atomic_t entry_count;
 
 static async_cookie_t lowest_in_progress(struct async_domain *domain)
 {
-	struct async_entry *first = NULL;
+	struct list_head *pending;
 	async_cookie_t ret = ASYNC_COOKIE_MAX;
 	unsigned long flags;
 
 	spin_lock_irqsave(&async_lock, flags);
 
-	if (domain) {
-		if (!list_empty(&domain->pending))
-			first = list_first_entry(&domain->pending,
-					struct async_entry, domain_list);
-	} else {
-		if (!list_empty(&async_global_pending))
-			first = list_first_entry(&async_global_pending,
-					struct async_entry, global_list);
-	}
+	if (domain)
+		pending = &domain->pending;
+	else
+		pending = &async_global_pending;
 
-	if (first)
-		ret = first->cookie;
+	if (!list_empty(pending))
+		ret = list_first_entry(pending, struct async_entry,
+				domain_list)->cookie;
 
 	spin_unlock_irqrestore(&async_lock, flags);
 	return ret;
-- 
1.7.4.4

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