linux-kernel - [PATCH 10/13] hpsa: take the adapter lock in hpsa_wait_for_mode_change

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Date:	Fri, 08 Oct 2010 15:06:52 -0500
From:	"Stephen M. Cameron" <scameron@...rdog.cce.hp.com>
To:	axboe@...nel.dk, James.Bottomley@...senPartnership.com
Cc:	akpm@...ux-foundation.org, thenzl@...hat.com, mike.miller@...com,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 10/13] hpsa: take the adapter lock in
	hpsa_wait_for_mode_change_ack

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

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@...rdog.cce.hp.com>
---
 drivers/scsi/hpsa.c |   11 ++++++++---
 1 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c
index d618432..ffc5f74 100644
--- a/drivers/scsi/hpsa.c
+++ b/drivers/scsi/hpsa.c
@@ -3576,13 +3576,18 @@ 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);
@@ -3754,6 +3759,8 @@ 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;
@@ -3813,8 +3820,6 @@ 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 */
 

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