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Commit 8a98db73 authored by Stephen M. Cameron's avatar Stephen M. Cameron Committed by James Bottomley
Browse files

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



Much simpler and avoids races starting/stopping the thread.

Signed-off-by: default avatarStephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: default avatarJames Bottomley <JBottomley@Parallels.com>
parent 95d8a25b

drivers/scsi/hpsa.c

+26 −77
Original line number Diff line number Diff line
@@ -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)

static void hpsa_monitor_ctlr_worker(struct work_struct *work)

{

	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);

	struct ctlr_info *h = container_of(to_delayed_work(work),

					struct ctlr_info, monitor_ctlr_work);

	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)

{

	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");

	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 @@ static int hpsa_init_one(struct pci_dev *pdev, const struct pci_device_id *ent) 


	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);

drivers/scsi/hpsa.h

+2 −1
Original line number Diff line number Diff line
@@ -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];