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[SCSI] hpsa: use workqueue instead of kernel thread for lockup detection 

Much simpler and avoids races starting/stopping the thread.

Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
This commit is contained in:
Stephen M. Cameron 2013-12-04 17:10:07 -06:00 committed by James Bottomley
parent 95d8a25b52
commit 8a98db7386
2 changed files with 28 additions and 78 deletions
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103
drivers/scsi/hpsa.c
View File

@ -168,10 +168,6 @@ static struct board_type products[] = {
static int number_of_controllers;
static struct list_head hpsa_ctlr_list = LIST_HEAD_INIT(hpsa_ctlr_list);
static spinlock_t lockup_detector_lock;
static struct task_struct *hpsa_lockup_detector;
static irqreturn_t do_hpsa_intr_intx(int irq, void *dev_id);
static irqreturn_t do_hpsa_intr_msi(int irq, void *dev_id);
static int hpsa_ioctl(struct scsi_device *dev, int cmd, void *arg);
@ -4716,16 +4712,6 @@ static void hpsa_undo_allocations_after_kdump_soft_reset(struct ctlr_info *h)
kfree(h);
}
static void remove_ctlr_from_lockup_detector_list(struct ctlr_info *h)
{
assert_spin_locked(&lockup_detector_lock);
if (!hpsa_lockup_detector)
return;
if (h->lockup_detected)
return; /* already stopped the lockup detector */
list_del(&h->lockup_list);
}
/* Called when controller lockup detected. */
static void fail_all_cmds_on_list(struct ctlr_info *h, struct list_head *list)
{
@ -4744,8 +4730,6 @@ static void controller_lockup_detected(struct ctlr_info *h)
{
unsigned long flags;
assert_spin_locked(&lockup_detector_lock);
remove_ctlr_from_lockup_detector_list(h);
h->access.set_intr_mask(h, HPSA_INTR_OFF);
spin_lock_irqsave(&h->lock, flags);
h->lockup_detected = readl(h->vaddr + SA5_SCRATCHPAD_OFFSET);
@ -4765,7 +4749,6 @@ static void detect_controller_lockup(struct ctlr_info *h)
u32 heartbeat;
unsigned long flags;
assert_spin_locked(&lockup_detector_lock);
now = get_jiffies_64();
/* If we've received an interrupt recently, we're ok. */
if (time_after64(h->last_intr_timestamp +
@ -4795,68 +4778,22 @@ static void detect_controller_lockup(struct ctlr_info *h)
h->last_heartbeat_timestamp = now;
}
static int detect_controller_lockup_thread(void *notused)
{
struct ctlr_info *h;
unsigned long flags;
while (1) {
struct list_head *this, *tmp;
schedule_timeout_interruptible(HEARTBEAT_SAMPLE_INTERVAL);
if (kthread_should_stop())
break;
spin_lock_irqsave(&lockup_detector_lock, flags);
list_for_each_safe(this, tmp, &hpsa_ctlr_list) {
h = list_entry(this, struct ctlr_info, lockup_list);
detect_controller_lockup(h);
}
spin_unlock_irqrestore(&lockup_detector_lock, flags);
}
return 0;
}
static void add_ctlr_to_lockup_detector_list(struct ctlr_info *h)
static void hpsa_monitor_ctlr_worker(struct work_struct *work)
{
unsigned long flags;
h->heartbeat_sample_interval = HEARTBEAT_SAMPLE_INTERVAL;
spin_lock_irqsave(&lockup_detector_lock, flags);
list_add_tail(&h->lockup_list, &hpsa_ctlr_list);
spin_unlock_irqrestore(&lockup_detector_lock, flags);
}
static void start_controller_lockup_detector(struct ctlr_info *h)
{
/* Start the lockup detector thread if not already started */
if (!hpsa_lockup_detector) {
spin_lock_init(&lockup_detector_lock);
hpsa_lockup_detector =
kthread_run(detect_controller_lockup_thread,
NULL, HPSA);
}
if (!hpsa_lockup_detector) {
dev_warn(&h->pdev->dev,
"Could not start lockup detector thread\n");
struct ctlr_info *h = container_of(to_delayed_work(work),
struct ctlr_info, monitor_ctlr_work);
detect_controller_lockup(h);
if (h->lockup_detected)
return;
spin_lock_irqsave(&h->lock, flags);
if (h->remove_in_progress) {
spin_unlock_irqrestore(&h->lock, flags);
return;
}
add_ctlr_to_lockup_detector_list(h);
}
static void stop_controller_lockup_detector(struct ctlr_info *h)
{
unsigned long flags;
spin_lock_irqsave(&lockup_detector_lock, flags);
remove_ctlr_from_lockup_detector_list(h);
/* If the list of ctlr's to monitor is empty, stop the thread */
if (list_empty(&hpsa_ctlr_list)) {
spin_unlock_irqrestore(&lockup_detector_lock, flags);
kthread_stop(hpsa_lockup_detector);
spin_lock_irqsave(&lockup_detector_lock, flags);
hpsa_lockup_detector = NULL;
}
spin_unlock_irqrestore(&lockup_detector_lock, flags);
schedule_delayed_work(&h->monitor_ctlr_work,
h->heartbeat_sample_interval);
spin_unlock_irqrestore(&h->lock, flags);
}
static int hpsa_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
@ -5004,7 +4941,12 @@ reinit_after_soft_reset:
hpsa_hba_inquiry(h);
hpsa_register_scsi(h); /* hook ourselves into SCSI subsystem */
start_controller_lockup_detector(h);
/* Monitor the controller for firmware lockups */
h->heartbeat_sample_interval = HEARTBEAT_SAMPLE_INTERVAL;
INIT_DELAYED_WORK(&h->monitor_ctlr_work, hpsa_monitor_ctlr_worker);
schedule_delayed_work(&h->monitor_ctlr_work,
h->heartbeat_sample_interval);
return 0;
clean4:
@ -5079,13 +5021,20 @@ static void hpsa_free_device_info(struct ctlr_info *h)
static void hpsa_remove_one(struct pci_dev *pdev)
{
struct ctlr_info *h;
unsigned long flags;
if (pci_get_drvdata(pdev) == NULL) {
dev_err(&pdev->dev, "unable to remove device\n");
return;
}
h = pci_get_drvdata(pdev);
stop_controller_lockup_detector(h);
/* Get rid of any controller monitoring work items */
spin_lock_irqsave(&h->lock, flags);
h->remove_in_progress = 1;
cancel_delayed_work(&h->monitor_ctlr_work);
spin_unlock_irqrestore(&h->lock, flags);
hpsa_unregister_scsi(h); /* unhook from SCSI subsystem */
hpsa_shutdown(pdev);
iounmap(h->vaddr);

3
drivers/scsi/hpsa.h
View File

@ -135,7 +135,8 @@ struct ctlr_info {
u32 heartbeat_sample_interval;
atomic_t firmware_flash_in_progress;
u32 lockup_detected;
struct list_head lockup_list;
struct delayed_work monitor_ctlr_work;
int remove_in_progress;
u32 fifo_recently_full;
/* Address of h->q[x] is passed to intr handler to know which queue */
u8 q[MAX_REPLY_QUEUES];