[SCSI] libsas: convert ha->state to flags

In preparation for adding new states (SAS_HA_DRAINING, SAS_HA_FROZEN),
convert ha->state into a set of flags.
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

drivers/scsi/libsas/sas_init.c

@@ -112,7 +112,7 @@ int sas_register_ha(struct sas_ha_struct *sas_ha)
 	else if (sas_ha->lldd_queue_size == -1)
 		sas_ha->lldd_queue_size = 128; /* Sanity */
 
-	sas_ha->state = SAS_HA_REGISTERED;
+	set_bit(SAS_HA_REGISTERED, &sas_ha->state);
 	spin_lock_init(&sas_ha->state_lock);
 
 	error = sas_register_phys(sas_ha);
@@ -160,7 +160,7 @@ int sas_unregister_ha(struct sas_ha_struct *sas_ha)
 	/* Set the state to unregistered to avoid further
 	 * events to be queued */
 	spin_lock_irqsave(&sas_ha->state_lock, flags);
-	sas_ha->state = SAS_HA_UNREGISTERED;
+	clear_bit(SAS_HA_REGISTERED, &sas_ha->state);
 	spin_unlock_irqrestore(&sas_ha->state_lock, flags);
 	scsi_flush_work(sas_ha->core.shost);
 

drivers/scsi/libsas/sas_internal.h

@@ -100,7 +100,7 @@ static inline void sas_queue_event(int event, unsigned long *pending,
 		unsigned long flags;
 
 		spin_lock_irqsave(&sas_ha->state_lock, flags);
-		if (sas_ha->state != SAS_HA_UNREGISTERED)
+		if (test_bit(SAS_HA_REGISTERED, &sas_ha->state))
 			scsi_queue_work(sas_ha->core.shost, work);
 		spin_unlock_irqrestore(&sas_ha->state_lock, flags);
 	}

include/scsi/libsas.h

@@ -330,7 +330,6 @@ struct sas_ha_event {
 
 enum sas_ha_state {
 	SAS_HA_REGISTERED,
-	SAS_HA_UNREGISTERED
 };
 
 struct sas_ha_struct {
@@ -338,7 +337,7 @@ struct sas_ha_struct {
 	struct sas_ha_event ha_events[HA_NUM_EVENTS];
 	unsigned long	 pending;
 
-	enum sas_ha_state state;
+	unsigned long	  state;
 	spinlock_t 	  state_lock;
 
 	struct scsi_core core;