[PATCH 01/41] hpsa: revert bring logical drives online when format completes

["Stephen M. Cameron" <scameron@beardog.cce.hp.com>]

From: Stephen M. Cameron <scameron@beardog.cce.hp.com>

This relies on a kernel thread which I wish to remove and
replace with a work queue based solution.

Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
---
 drivers/scsi/hpsa.c |  128 ---------------------------------------------------
 drivers/scsi/hpsa.h |   13 -----
 2 files changed, 1 insertions(+), 140 deletions(-)

diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c
index 604f5d0..06cb802 100644
--- a/drivers/scsi/hpsa.c
+++ b/drivers/scsi/hpsa.c
@@ -220,8 +220,6 @@ static int hpsa_lookup_board_id(struct pci_dev *pdev, u32 *board_id);
 static int hpsa_wait_for_board_state(struct pci_dev *pdev, void __iomem *vaddr,
 				     int wait_for_ready);
 static inline void finish_cmd(struct CommandList *c);
-static unsigned char hpsa_format_in_progress(struct ctlr_info *h,
-		unsigned char scsi3addr[]);
 #define BOARD_NOT_READY 0
 #define BOARD_READY 1
 
@@ -946,112 +944,6 @@ static int hpsa_scsi_find_entry(struct hpsa_scsi_dev_t *needle,
 	return DEVICE_NOT_FOUND;
 }
 
-#define OFFLINE_DEVICE_POLL_INTERVAL (120 * HZ)
-static int hpsa_offline_device_thread(void *v)
-{
-	struct ctlr_info *h = v;
-	unsigned long flags;
-	struct offline_device_entry *d;
-	unsigned char need_rescan = 0;
-	struct list_head *this, *tmp;
-
-	while (1) {
-		schedule_timeout_interruptible(OFFLINE_DEVICE_POLL_INTERVAL);
-		if (kthread_should_stop())
-			break;
-
-		/* Check if any of the offline devices have become ready */
-		spin_lock_irqsave(&h->offline_device_lock, flags);
-		list_for_each_safe(this, tmp, &h->offline_device_list) {
-			d = list_entry(this, struct offline_device_entry,
-					offline_list);
-			spin_unlock_irqrestore(&h->offline_device_lock, flags);
-			if (!hpsa_format_in_progress(h, d->scsi3addr)) {
-				need_rescan = 1;
-				goto do_rescan;
-			}
-			spin_lock_irqsave(&h->offline_device_lock, flags);
-		}
-		spin_unlock_irqrestore(&h->offline_device_lock, flags);
-	}
-
-do_rescan:
-
-	/* Remove all entries from the list and rescan and exit this thread.
-	 * If there are still offline devices, the rescan will make a new list
-	 * and create a new offline device monitor thread.
-	 */
-	spin_lock_irqsave(&h->offline_device_lock, flags);
-	list_for_each_safe(this, tmp, &h->offline_device_list) {
-		d = list_entry(this, struct offline_device_entry, offline_list);
-		list_del_init(this);
-		kfree(d);
-	}
-	h->offline_device_monitor = NULL;
-	h->offline_device_thread_state = OFFLINE_DEVICE_THREAD_STOPPED;
-	spin_unlock_irqrestore(&h->offline_device_lock, flags);
-	if (need_rescan)
-		hpsa_scan_start(h->scsi_host);
-	return 0;
-}
-
-static void hpsa_monitor_offline_device(struct ctlr_info *h,
-					unsigned char scsi3addr[])
-{
-	struct offline_device_entry *device;
-	unsigned long flags;
-
-	/* Check to see if device is already on the list */
-	spin_lock_irqsave(&h->offline_device_lock, flags);
-	list_for_each_entry(device, &h->offline_device_list, offline_list) {
-		if (memcmp(device->scsi3addr, scsi3addr,
-				sizeof(device->scsi3addr)) == 0) {
-			spin_unlock_irqrestore(&h->offline_device_lock, flags);
-			return;
-		}
-	}
-	spin_unlock_irqrestore(&h->offline_device_lock, flags);
-
-	/* Device is not on the list, add it. */
-	device = kmalloc(sizeof(*device), GFP_KERNEL);
-	if (!device) {
-		dev_warn(&h->pdev->dev, "out of memory in %s\n", __func__);
-		return;
-	}
-	memcpy(device->scsi3addr, scsi3addr, sizeof(device->scsi3addr));
-	spin_lock_irqsave(&h->offline_device_lock, flags);
-	list_add_tail(&device->offline_list, &h->offline_device_list);
-	if (h->offline_device_thread_state == OFFLINE_DEVICE_THREAD_STOPPED) {
-		h->offline_device_thread_state = OFFLINE_DEVICE_THREAD_RUNNING;
-		spin_unlock_irqrestore(&h->offline_device_lock, flags);
-		h->offline_device_monitor =
-			kthread_run(hpsa_offline_device_thread, h, HPSA "-odm");
-		spin_lock_irqsave(&h->offline_device_lock, flags);
-	}
-	if (!h->offline_device_monitor) {
-		dev_warn(&h->pdev->dev, "failed to start offline device monitor thread.\n");
-		h->offline_device_thread_state = OFFLINE_DEVICE_THREAD_STOPPED;
-	}
-	spin_unlock_irqrestore(&h->offline_device_lock, flags);
-}
-
-static void stop_offline_device_monitor(struct ctlr_info *h)
-{
-	unsigned long flags;
-	int stop_thread;
-
-	spin_lock_irqsave(&h->offline_device_lock, flags);
-	stop_thread = (h->offline_device_thread_state ==
-				OFFLINE_DEVICE_THREAD_RUNNING);
-	if (stop_thread)
-		/* STOPPING state prevents new thread from starting. */
-		h->offline_device_thread_state =
-				OFFLINE_DEVICE_THREAD_STOPPING;
-	spin_unlock_irqrestore(&h->offline_device_lock, flags);
-	if (stop_thread)
-		kthread_stop(h->offline_device_monitor);
-}
-
 static void adjust_hpsa_scsi_table(struct ctlr_info *h, int hostno,
 	struct hpsa_scsi_dev_t *sd[], int nsds)
 {
@@ -1124,10 +1016,7 @@ static void adjust_hpsa_scsi_table(struct ctlr_info *h, int hostno,
 		 */
 		if (sd[i]->format_in_progress) {
 			dev_info(&h->pdev->dev,
-				"c%db%dt%dl%d: Logical drive parity initialization, erase or format in progress\n",
-				h->scsi_host->host_no,
-				sd[i]->bus, sd[i]->target, sd[i]->lun);
-			dev_info(&h->pdev->dev, "c%db%dt%dl%d: temporarily offline\n",
+				"Logical drive format in progress, device c%db%dt%dl%d offline.\n",
 				h->scsi_host->host_no,
 				sd[i]->bus, sd[i]->target, sd[i]->lun);
 			continue;
@@ -1151,17 +1040,6 @@ static void adjust_hpsa_scsi_table(struct ctlr_info *h, int hostno,
 	}
 	spin_unlock_irqrestore(&h->devlock, flags);
 
-	/* Monitor devices which are NOT READY, FORMAT IN PROGRESS to be
-	 * brought online later. This must be done without holding h->devlock,
-	 * so don't touch h->dev[]
-	 */
-	for (i = 0; i < nsds; i++) {
-		if (!sd[i]) /* if already added above. */
-			continue;
-		if (sd[i]->format_in_progress)
-			hpsa_monitor_offline_device(h, sd[i]->scsi3addr);
-	}
-
 	/* Don't notify scsi mid layer of any changes the first time through
 	 * (or if there are no changes) scsi_scan_host will do it later the
 	 * first time through.
@@ -5066,10 +4944,8 @@ reinit_after_soft_reset:
 	h->intr_mode = hpsa_simple_mode ? SIMPLE_MODE_INT : PERF_MODE_INT;
 	INIT_LIST_HEAD(&h->cmpQ);
 	INIT_LIST_HEAD(&h->reqQ);
-	INIT_LIST_HEAD(&h->offline_device_list);
 	spin_lock_init(&h->lock);
 	spin_lock_init(&h->scan_lock);
-	spin_lock_init(&h->offline_device_lock);
 	spin_lock_init(&h->passthru_count_lock);
 	rc = hpsa_pci_init(h);
 	if (rc != 0)
@@ -5078,7 +4954,6 @@ reinit_after_soft_reset:
 	sprintf(h->devname, HPSA "%d", number_of_controllers);
 	h->ctlr = number_of_controllers;
 	number_of_controllers++;
-	h->offline_device_thread_state = OFFLINE_DEVICE_THREAD_STOPPED;
 
 	/* configure PCI DMA stuff */
 	rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
@@ -5257,7 +5132,6 @@ static void hpsa_remove_one(struct pci_dev *pdev)
 	}
 	h = pci_get_drvdata(pdev);
 	stop_controller_lockup_detector(h);
-	stop_offline_device_monitor(h);
 	hpsa_unregister_scsi(h);	/* unhook from SCSI subsystem */
 	hpsa_shutdown(pdev);
 	iounmap(h->vaddr);
diff --git a/drivers/scsi/hpsa.h b/drivers/scsi/hpsa.h
index bea2365..04074f5 100644
--- a/drivers/scsi/hpsa.h
+++ b/drivers/scsi/hpsa.h
@@ -161,20 +161,7 @@ struct ctlr_info {
 #define HPSATMF_LOG_QRY_TASK    (1 << 23)
 #define HPSATMF_LOG_QRY_TSET    (1 << 24)
 #define HPSATMF_LOG_QRY_ASYNC   (1 << 25)
-	spinlock_t offline_device_lock;
-	struct list_head offline_device_list;
-	struct task_struct *offline_device_monitor;
-	unsigned char offline_device_thread_state;
-#define OFFLINE_DEVICE_THREAD_STOPPED 0
-#define OFFLINE_DEVICE_THREAD_STOPPING 1
-#define OFFLINE_DEVICE_THREAD_RUNNING 2
 };
-
-struct offline_device_entry {
-	unsigned char scsi3addr[8];
-	struct list_head offline_list;
-};
-
 #define HPSA_ABORT_MSG 0
 #define HPSA_DEVICE_RESET_MSG 1
 #define HPSA_RESET_TYPE_CONTROLLER 0x00