diff options
| author | Xiaotian Feng <xtfeng@gmail.com> | 2012-12-04 19:33:54 +0800 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2012-12-04 07:29:47 -0800 |
| commit | c1d390d8e6128b050f0f66b1c33d390760deb3f4 (patch) | |
| tree | edbdf78f783da84eeacb7041a8b64d3096ce1f81 | |
| parent | 8852aac25e79e38cc6529f20298eed154f60b574 (diff) | |
megaraid: fix BUG_ON() from incorrect 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 ("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@tencent.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Neela Syam Kolli <megaraidlinux@lsi.com>
Cc: "James E.J. Bottomley" <JBottomley@parallels.com>
Cc: linux-scsi@vger.kernel.org
| -rw-r--r-- | drivers/scsi/megaraid/megaraid_sas.h | 2 | ||||
| -rw-r--r-- | 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 16b7a72a70c..3b2365c8eab 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 d2c5366aff7..e4f2baacf1e 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; |