[SCSI] libsas: fix mixed topology recovery

If we have a domain with sas and sata devices there may still be sas
recovery actions to take after peeling off the commands to send to
libata.
Reported-by: Andrzej Jakowski <andrzej.jakowski@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

drivers/scsi/libsas/sas_ata.c

@@ -699,10 +699,9 @@ void sas_ata_strategy_handler(struct Scsi_Host *shost)
 	sas_enable_revalidation(sas_ha);
 }
 
-int sas_ata_eh(struct Scsi_Host *shost, struct list_head *work_q,
+void sas_ata_eh(struct Scsi_Host *shost, struct list_head *work_q,
 		struct list_head *done_q)
 {
-	int rtn = 0;
 	struct scsi_cmnd *cmd, *n;
 	struct ata_port *ap;
 
@@ -719,7 +718,6 @@ int sas_ata_eh(struct Scsi_Host *shost, struct list_head *work_q,
 			if (ap && ap != ddev->sata_dev.ap)
 				continue;
 			ap = ddev->sata_dev.ap;
-			rtn = 1;
 			list_move(&cmd->eh_entry, &sata_q);
 		}
 
@@ -741,8 +739,6 @@ int sas_ata_eh(struct Scsi_Host *shost, struct list_head *work_q,
 				list_del_init(sata_q.next);
 		}
 	} while (ap);
-
-	return rtn;
 }
 
 void sas_ata_schedule_reset(struct domain_device *dev)

drivers/scsi/libsas/sas_scsi_host.c

@@ -678,7 +678,8 @@ void sas_scsi_recover_host(struct Scsi_Host *shost)
 	shost->host_eh_scheduled = 0;
 	spin_unlock_irqrestore(shost->host_lock, flags);
 
-	SAS_DPRINTK("Enter %s\n", __func__);
+	SAS_DPRINTK("Enter %s busy: %d failed: %d\n",
+		    __func__, shost->host_busy, shost->host_failed);
 	/*
 	 * Deal with commands that still have SAS tasks (i.e. they didn't
 	 * complete via the normal sas_task completion mechanism)
@@ -693,7 +694,7 @@ void sas_scsi_recover_host(struct Scsi_Host *shost)
 	 * scsi_unjam_host does, but we skip scsi_eh_abort_cmds because any
 	 * command we see here has no sas_task and is thus unknown to the HA.
 	 */
-	if (!sas_ata_eh(shost, &eh_work_q, &ha->eh_done_q))
+	sas_ata_eh(shost, &eh_work_q, &ha->eh_done_q);
 	if (!scsi_eh_get_sense(&eh_work_q, &ha->eh_done_q))
 		scsi_eh_ready_devs(shost, &eh_work_q, &ha->eh_done_q);
 
@@ -707,8 +708,8 @@ void sas_scsi_recover_host(struct Scsi_Host *shost)
 
 	scsi_eh_flush_done_q(&ha->eh_done_q);
 
-	SAS_DPRINTK("--- Exit %s\n", __func__);
-	return;
+	SAS_DPRINTK("--- Exit %s: busy: %d failed: %d\n",
+		    __func__, shost->host_busy, shost->host_failed);
 }
 
 enum blk_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *cmd)

include/scsi/sas_ata.h

@@ -41,7 +41,7 @@ int sas_ata_init_host_and_port(struct domain_device *found_dev,
 
 void sas_ata_task_abort(struct sas_task *task);
 void sas_ata_strategy_handler(struct Scsi_Host *shost);
-int sas_ata_eh(struct Scsi_Host *shost, struct list_head *work_q,
+void sas_ata_eh(struct Scsi_Host *shost, struct list_head *work_q,
 		struct list_head *done_q);
 void sas_probe_sata(struct work_struct *work);
 void sas_ata_schedule_reset(struct domain_device *dev);
@@ -66,10 +66,9 @@ static inline void sas_ata_strategy_handler(struct Scsi_Host *shost)
 {
 }
 
-static inline int sas_ata_eh(struct Scsi_Host *shost, struct list_head *work_q,
+static inline void sas_ata_eh(struct Scsi_Host *shost, struct list_head *work_q,
 			      struct list_head *done_q)
 {
-	return 0;
 }
 
 static inline void sas_probe_sata(struct work_struct *work)