pm8001: add a new spinlock to protect the CCB

Patch adds a new spinlock to protect the ccb management.
It may happen that concurrent threads become the same tag value
from the 'alloc' function', the spinlock prevents this situation.

Signed-off-by: Tomas Henzl <thenzl@redhat.com>
Acked-by: Suresh Thiagarajan <Suresh.Thiagarajan@pmcs.com>
Acked-by: Jack Wang <xjtuwjp@gmail.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>

drivers/scsi/pm8001/pm8001_sas.h

@@ -475,6 +475,7 @@ struct pm8001_hba_info {
 	struct list_head	list;
 	unsigned long		flags;
 	spinlock_t		lock;/* host-wide lock */
+	spinlock_t		bitmap_lock;
 	struct pci_dev		*pdev;/* our device */
 	struct device		*dev;
 	struct pm8001_hba_memspace io_mem[6];