[SCSI] hpsa: take the adapter lock in hpsa_wait_for_mode_change_ack

Need to take the lock while accessing the register to check to
see if config table changes have taken effect.

Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c
index 5b9cd41..4fb62c2 100644 (file)
--- a/drivers/scsi/hpsa.c
+++ b/drivers/scsi/hpsa.c
@@ -3553,13 +3553,18 @@ static inline void hpsa_p600_dma_prefetch_quirk(struct ctlr_info *h)
 static void __devinit hpsa_wait_for_mode_change_ack(struct ctlr_info *h)
 {
        int i;
+       u32 doorbell_value;
+       unsigned long flags;
 
        /* under certain very rare conditions, this can take awhile.
         * (e.g.: hot replace a failed 144GB drive in a RAID 5 set right
         * as we enter this code.)
         */
        for (i = 0; i < MAX_CONFIG_WAIT; i++) {
-               if (!(readl(h->vaddr + SA5_DOORBELL) & CFGTBL_ChangeReq))
+               spin_lock_irqsave(&h->lock, flags);
+               doorbell_value = readl(h->vaddr + SA5_DOORBELL);
+               spin_unlock_irqrestore(&h->lock, flags);
+               if (!doorbell_value & CFGTBL_ChangeReq)
                        break;
                /* delay and try again */
                msleep(10);
@@ -3731,6 +3736,8 @@ static int __devinit hpsa_init_one(struct pci_dev *pdev,
        h->busy_initializing = 1;
        INIT_HLIST_HEAD(&h->cmpQ);
        INIT_HLIST_HEAD(&h->reqQ);
+       spin_lock_init(&h->lock);
+       spin_lock_init(&h->scan_lock);
        rc = hpsa_pci_init(h);
        if (rc != 0)
                goto clean1;
@@ -3790,8 +3797,6 @@ static int __devinit hpsa_init_one(struct pci_dev *pdev,
        }
        if (hpsa_allocate_sg_chain_blocks(h))
                goto clean4;
-       spin_lock_init(&h->lock);
-       spin_lock_init(&h->scan_lock);
        init_waitqueue_head(&h->scan_wait_queue);
        h->scan_finished = 1; /* no scan currently in progress */