lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <1348481238-6138-3-git-send-email-laijs@cn.fujitsu.com>
Date:	Mon, 24 Sep 2012 18:07:04 +0800
From:	Lai Jiangshan <laijs@...fujitsu.com>
To:	Tejun Heo <tj@...nel.org>, linux-kernel@...r.kernel.org
Cc:	Lai Jiangshan <laijs@...fujitsu.com>
Subject: [PATCH 02/10] workqueue: remove unneeded check

Since we always pass flush responsibility to next, we will not deprive it,
now the ->first_flusher can only be changed by the first_flusher, no one
can change it, no race as 4ce48b37 said.

Remove the check introduced by 4ce48b37, use BUG_ON() instead.

Also move "wq->first_flusher = NULL;" later.

This patch doesn't make any functional difference.

Signed-off-by: Lai Jiangshan <laijs@...fujitsu.com>
---
 kernel/workqueue.c |    8 ++------
 1 files changed, 2 insertions(+), 6 deletions(-)

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 360b7e2..acd9e2f 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -2682,12 +2682,7 @@ void flush_workqueue(struct workqueue_struct *wq)
 
 	mutex_lock(&wq->flush_mutex);
 
-	/* we might have raced, check again with mutex held */
-	if (wq->first_flusher != &this_flusher)
-		goto out_unlock;
-
-	wq->first_flusher = NULL;
-
+	BUG_ON(wq->first_flusher != &this_flusher);
 	BUG_ON(!list_empty(&this_flusher.list));
 	BUG_ON(wq->flush_color != this_flusher.flush_color);
 
@@ -2728,6 +2723,7 @@ void flush_workqueue(struct workqueue_struct *wq)
 
 		if (list_empty(&wq->flusher_queue)) {
 			BUG_ON(wq->flush_color != wq->work_color);
+			wq->first_flusher = NULL;
 			break;
 		}
 
-- 
1.7.4.4

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ