linux-kernel - [PATCH 1/2] megaraid: fix BUG_ON() from incorrect use of delayed work

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Message-ID: <20121204155434.GE3885@mtj.dyndns.org>
Date:	Tue, 4 Dec 2012 07:54:34 -0800
From:	Tejun Heo <tj@...nel.org>
To:	Xiaotian Feng <xtfeng@...il.com>
Cc:	linux-kernel@...r.kernel.org,
	Xiaotian Feng <dannyfeng@...cent.com>,
	Neela Syam Kolli <megaraidlinux@....com>,
	"James E.J. Bottomley" <JBottomley@...allels.com>,
	linux-scsi@...r.kernel.org
Subject: [PATCH 1/2] megaraid: fix BUG_ON() from incorrect use of delayed work

>From c1d390d8e6128b050f0f66b1c33d390760deb3f4 Mon Sep 17 00:00:00 2001
From: Xiaotian Feng <xtfeng@...il.com>
Date: Tue, 4 Dec 2012 19:33:54 +0800

megaraid use INIT_WORK to declare a hotplug_work, but cast the
hotplug_work from work_struct to delayed_work and
schedule_delayed_work on it.  This is very dangerous, as other part of
delayed_work might be kernel memories allocated by others.

With commit 8852aac ("workqueue: mod_delayed_work_on() shouldn't queue
timer on 0 delay"), schedule_delayed_work() will check dwork->timer
before queue_work even when @delay is 0, this causes megaraid code to
hit the BUG_ON() in workqueue code.  Change megaraid code to use
delayed work.

Signed-off-by: Xiaotian Feng <dannyfeng@...cent.com>
Signed-off-by: Tejun Heo <tj@...nel.org>
Cc: Neela Syam Kolli <megaraidlinux@....com>
Cc: "James E.J. Bottomley" <JBottomley@...allels.com>
Cc: linux-scsi@...r.kernel.org
---
 drivers/scsi/megaraid/megaraid_sas.h      |  2 +-
 drivers/scsi/megaraid/megaraid_sas_base.c | 14 ++++++--------
 2 files changed, 7 insertions(+), 9 deletions(-)

diff --git a/drivers/scsi/megaraid/megaraid_sas.h b/drivers/scsi/megaraid/megaraid_sas.h
index 16b7a72..3b2365c 100644
--- a/drivers/scsi/megaraid/megaraid_sas.h
+++ b/drivers/scsi/megaraid/megaraid_sas.h
@@ -1276,7 +1276,7 @@ struct megasas_evt_detail {
 } __attribute__ ((packed));
 
 struct megasas_aen_event {
-	struct work_struct hotplug_work;
+	struct delayed_work hotplug_work;
 	struct megasas_instance *instance;
 };
 
diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c b/drivers/scsi/megaraid/megaraid_sas_base.c
index d2c5366..e4f2baa 100644
--- a/drivers/scsi/megaraid/megaraid_sas_base.c
+++ b/drivers/scsi/megaraid/megaraid_sas_base.c
@@ -2060,9 +2060,9 @@ megasas_service_aen(struct megasas_instance *instance, struct megasas_cmd *cmd)
 		} else {
 			ev->instance = instance;
 			instance->ev = ev;
-			INIT_WORK(&ev->hotplug_work, megasas_aen_polling);
-			schedule_delayed_work(
-				(struct delayed_work *)&ev->hotplug_work, 0);
+			INIT_DELAYED_WORK(&ev->hotplug_work,
+					  megasas_aen_polling);
+			schedule_delayed_work(&ev->hotplug_work, 0);
 		}
 	}
 }
@@ -4352,8 +4352,7 @@ megasas_suspend(struct pci_dev *pdev, pm_message_t state)
 	/* cancel the delayed work if this work still in queue */
 	if (instance->ev != NULL) {
 		struct megasas_aen_event *ev = instance->ev;
-		cancel_delayed_work_sync(
-			(struct delayed_work *)&ev->hotplug_work);
+		cancel_delayed_work_sync(&ev->hotplug_work);
 		instance->ev = NULL;
 	}
 
@@ -4545,8 +4544,7 @@ static void __devexit megasas_detach_one(struct pci_dev *pdev)
 	/* cancel the delayed work if this work still in queue*/
 	if (instance->ev != NULL) {
 		struct megasas_aen_event *ev = instance->ev;
-		cancel_delayed_work_sync(
-			(struct delayed_work *)&ev->hotplug_work);
+		cancel_delayed_work_sync(&ev->hotplug_work);
 		instance->ev = NULL;
 	}
 
@@ -5190,7 +5188,7 @@ static void
 megasas_aen_polling(struct work_struct *work)
 {
 	struct megasas_aen_event *ev =
-		container_of(work, struct megasas_aen_event, hotplug_work);
+		container_of(work, struct megasas_aen_event, hotplug_work.work);
 	struct megasas_instance *instance = ev->instance;
 	union megasas_evt_class_locale class_locale;
 	struct  Scsi_Host *host;
-- 
1.7.11.7

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