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From: "Ed L. Cashin" <ecashin@coraid.com>
To: linux-kernel@vger.kernel.org
Cc: "Ed L. Cashin" <ecashin@coraid.com>, Greg KH <greg@kroah.com>
Subject: [PATCH 09/13] remove race between use and initialization of locks
Date: Fri,  7 Dec 2007 12:48:07 -0500	[thread overview]
Message-ID: <1197049691-27462-9-git-send-email-ecashin@coraid.com> (raw)
In-Reply-To: <1197049691-27462-1-git-send-email-ecashin@coraid.com>

Alexey Dobriyan noticed a race in the initialization of the dynamic
locks in ...

  Message-ID: <20070325190221.GA5308@martell.zuzino.mipt.ru>

Andrew Morton commented that these locks should be initialized at
compile time, so this patch does that.

Signed-off-by: Ed L. Cashin <ecashin@coraid.com>
---
 drivers/block/aoe/aoechr.c |    6 ++----
 1 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/block/aoe/aoechr.c b/drivers/block/aoe/aoechr.c
index 166f54f..0ce9bda 100644
--- a/drivers/block/aoe/aoechr.c
+++ b/drivers/block/aoe/aoechr.c
@@ -35,8 +35,8 @@ struct ErrMsg {
 
 static struct ErrMsg emsgs[NMSG];
 static int emsgs_head_idx, emsgs_tail_idx;
-static struct semaphore emsgs_sema;
-static spinlock_t emsgs_lock;
+static __DECLARE_SEMAPHORE_GENERIC(emsgs_sema, 0);
+static DEFINE_SPINLOCK(emsgs_lock);
 static int nblocked_emsgs_readers;
 static struct class *aoe_class;
 static struct aoe_chardev chardevs[] = {
@@ -264,8 +264,6 @@ aoechr_init(void)
 		printk(KERN_ERR "aoe: can't register char device\n");
 		return n;
 	}
-	sema_init(&emsgs_sema, 0);
-	spin_lock_init(&emsgs_lock);
 	aoe_class = class_create(THIS_MODULE, "aoe");
 	if (IS_ERR(aoe_class)) {
 		unregister_chrdev(AOE_MAJOR, "aoechr");
-- 
1.5.3.4


  parent reply	other threads:[~2007-12-07 17:52 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-12-07 17:47 [PATCH 01/13] bring driver version number to 47 Ed L. Cashin
2007-12-07 17:48 ` [PATCH 02/13] handle multiple network paths to AoE device Ed L. Cashin
2007-12-07 17:48 ` [PATCH 03/13] mac_addr: avoid 64-bit arch compiler warnings Ed L. Cashin
2007-12-07 17:48 ` [PATCH 04/13] clean up udev configuration example Ed L. Cashin
2007-12-07 17:48 ` [PATCH 05/13] eliminate goto and improve readability Ed L. Cashin
2007-12-07 17:48 ` [PATCH 06/13] user can ask driver to forget previously detected devices Ed L. Cashin
2007-12-07 17:48 ` [PATCH 07/13] dynamically allocate a capped number of skbs when necessary Ed L. Cashin
2007-12-07 17:48 ` [PATCH 08/13] only install new AoE device once Ed L. Cashin
2007-12-07 17:48 ` Ed L. Cashin [this message]
2007-12-07 17:48 ` [PATCH 10/13] add module parameter for users who need more outstanding I/O Ed L. Cashin
2007-12-07 17:48 ` [PATCH 11/13] remove extra space in prototypes for consistency Ed L. Cashin
2007-12-07 17:48 ` [PATCH 12/13] the aoeminor doesn't need a long format Ed L. Cashin
2007-12-07 17:48 ` [PATCH 13/13] make error messages more specific Ed L. Cashin
2007-12-20 22:15 [PATCH 01/13] bring driver version number to 47 Ed L. Cashin
2007-12-20 22:15 ` [PATCH 09/13] remove race between use and initialization of locks Ed L. Cashin
2007-12-22  6:00   ` Andrew Morton
2007-12-26 19:28     ` Ed L. Cashin

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