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Date: Tue, 4 Dec 2012 19:33:54 +0800
From: Xiaotian Feng <xtfeng@...il.com>
To: linux-kernel@...r.kernel.org, tj@...nel.org
Cc: Xiaotian Feng <xtfeng@...il.com>,
Xiaotian Feng <dannyfeng@...cent.com>,
Neela Syam Kolli <megaraidlinux@....com>,
"James E.J. Bottomley" <JBottomley@...allels.com>,
linux-scsi@...r.kernel.org
Subject: [PATCH] megaraid: fix use of delayed work
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, schedule_delayed_work() will check dwork->timer before
queue_work, this will cause 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>
Cc: 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;
--
1.7.9.6 (Apple Git-31.1)
--
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