linux-kernel - [PATCH 09/10] ipc: Simplify msg list search

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Message-Id: <1361845307-12737-10-git-send-email-peter@hurleysoftware.com>
Date:	Mon, 25 Feb 2013 21:21:46 -0500
From:	Peter Hurley <peter@...leysoftware.com>
To:	Stanislav Kinsbursky <skinsbursky@...allels.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Dave Jones <davej@...hat.com>,
	Peter Hurley <peter@...leysoftware.com>
Subject: [PATCH 09/10] ipc: Simplify msg list search


Signed-off-by: Peter Hurley <peter@...leysoftware.com>
---
 ipc/msg.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/ipc/msg.c b/ipc/msg.c
index 418c5a5..c3867da 100644
--- a/ipc/msg.c
+++ b/ipc/msg.c
@@ -837,7 +837,7 @@ long do_msgrcv(int msqid, void __user *buf, size_t bufsz, long msgtyp,
 
 	for (;;) {
 		struct msg_receiver msr_d;
-		struct list_head *tmp;
+		struct msg_msg *walk_msg;
 		long msg_counter = 0;
 
 		msg = ERR_PTR(-EACCES);
@@ -845,11 +845,8 @@ long do_msgrcv(int msqid, void __user *buf, size_t bufsz, long msgtyp,
 			goto out_unlock;
 
 		msg = ERR_PTR(-EAGAIN);
-		tmp = msq->q_messages.next;
-		while (tmp != &msq->q_messages) {
-			struct msg_msg *walk_msg;
+		list_for_each_entry(walk_msg, &msq->qmessages, m_list) {
 
-			walk_msg = list_entry(tmp, struct msg_msg, m_list);
 			if (testmsg(walk_msg, msgtyp, mode) &&
 			    !security_msg_queue_msgrcv(msq, walk_msg, current,
 						       msgtyp, mode)) {
@@ -865,7 +862,6 @@ long do_msgrcv(int msqid, void __user *buf, size_t bufsz, long msgtyp,
 					break;
 				msg_counter++;
 			}
-			tmp = tmp->next;
 		}
 		if (!IS_ERR(msg)) {
 			/*
-- 
1.8.1.2

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