scsi: libsas: Add flag SAS_HA_RESUMING

Add a flag SAS_HA_RESUMING and use it to indicate the state of resuming the
host controller.

Link: https://lore.kernel.org/r/1639999298-244569-11-git-send-email-chenxiang66@hisilicon.comReviewed-by: John Garry <john.garry@huawei.com>
Signed-off-by: Xiang Chen <chenxiang66@hisilicon.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/libsas/sas_init.c

@@ -362,6 +362,7 @@ void sas_prep_resume_ha(struct sas_ha_struct *ha)
 	int i;
 
 	set_bit(SAS_HA_REGISTERED, &ha->state);
+	set_bit(SAS_HA_RESUMING, &ha->state);
 
 	/* clear out any stale link events/data from the suspension path */
 	for (i = 0; i < ha->num_phys; i++) {
@@ -443,6 +444,7 @@ static void _sas_resume_ha(struct sas_ha_struct *ha, bool drain)
 	scsi_unblock_requests(ha->core.shost);
 	if (drain)
 		sas_drain_work(ha);
+	clear_bit(SAS_HA_RESUMING, &ha->state);
 
 	/* send event PORTE_BROADCAST_RCVD to identify some new inserted
 	 * disks for expander

include/scsi/libsas.h

@@ -356,6 +356,7 @@ enum sas_ha_state {
 	SAS_HA_DRAINING,
 	SAS_HA_ATA_EH_ACTIVE,
 	SAS_HA_FROZEN,
+	SAS_HA_RESUMING,
 };
 
 struct sas_ha_struct {