[SCSI] libsas: let libata handle command timeouts

libsas-eh if it successfully aborts an ata command will hide the timeout condition (AC_ERR_TIMEOUT) from libata. The command likely completes with the all-zero task->task_status it started with. Instead, interpret a TMF_RESP_FUNC_COMPLETE as the end of the sas_task but keep the scmd around for libata-eh to handle. Tested-by: Andrzej Jakowski <[email protected]> Signed-off-by: Dan Williams <[email protected]> Signed-off-by: James Bottomley <[email protected]>
sfionov · Feb 19, 2012 · 3944f50 · 3944f50
1 parent 9095a64
commit 3944f50
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Showing 3 changed files with 23 additions and 3 deletions.
diff --git a/drivers/scsi/libsas/sas_init.c b/drivers/scsi/libsas/sas_init.c
@@ -146,6 +146,7 @@ int sas_register_ha(struct sas_ha_struct *sas_ha)
 	}
 
 	INIT_LIST_HEAD(&sas_ha->eh_done_q);
+	INIT_LIST_HEAD(&sas_ha->eh_ata_q);
 
 	return 0;
 

diff --git a/drivers/scsi/libsas/sas_scsi_host.c b/drivers/scsi/libsas/sas_scsi_host.c
@@ -265,6 +265,22 @@ static void sas_eh_finish_cmd(struct scsi_cmnd *cmd)
 	scsi_eh_finish_cmd(cmd, &sas_ha->eh_done_q);
 }
 
+static void sas_eh_defer_cmd(struct scsi_cmnd *cmd)
+{
+	struct sas_task *task = TO_SAS_TASK(cmd);
+	struct domain_device *dev = task->dev;
+	struct sas_ha_struct *ha = dev->port->ha;
+
+	if (!dev_is_sata(dev)) {
+		sas_eh_finish_cmd(cmd);
+		return;
+	}
+
+	/* report the timeout to libata */
+	sas_end_task(cmd, task);
+	list_move_tail(&cmd->eh_entry, &ha->eh_ata_q);
+}
+
 static void sas_scsi_clear_queue_lu(struct list_head *error_q, struct scsi_cmnd *my_cmd)
 {
 	struct scsi_cmnd *cmd, *n;
@@ -562,12 +578,12 @@ static int sas_eh_handle_sas_errors(struct Scsi_Host *shost,
 		case TASK_IS_DONE:
 			SAS_DPRINTK("%s: task 0x%p is done\n", __func__,
 				    task);
-			sas_eh_finish_cmd(cmd);
+			sas_eh_defer_cmd(cmd);
 			continue;
 		case TASK_IS_ABORTED:
 			SAS_DPRINTK("%s: task 0x%p is aborted\n",
 				    __func__, task);
-			sas_eh_finish_cmd(cmd);
+			sas_eh_defer_cmd(cmd);
 			continue;
 		case TASK_IS_AT_LU:
 			SAS_DPRINTK("task 0x%p is at LU: lu recover\n", task);
@@ -635,12 +651,14 @@ static int sas_eh_handle_sas_errors(struct Scsi_Host *shost,
 			goto clear_q;
 		}
 	}
+	list_splice_tail_init(&ha->eh_ata_q, work_q);
 	return list_empty(work_q);
 clear_q:
 	SAS_DPRINTK("--- Exit %s -- clear_q\n", __func__);
 	list_for_each_entry_safe(cmd, n, work_q, eh_entry)
 		sas_eh_finish_cmd(cmd);
 
+	list_splice_tail_init(&ha->eh_ata_q, work_q);
 	return list_empty(work_q);
 }
 

diff --git a/include/scsi/libsas.h b/include/scsi/libsas.h
@@ -382,7 +382,8 @@ struct sas_ha_struct {
 
 	void *lldd_ha;		  /* not touched by sas class code */
 
-	struct list_head eh_done_q;
+	struct list_head eh_done_q;  /* complete via scsi_eh_flush_done_q */
+	struct list_head eh_ata_q; /* scmds to promote from sas to ata eh */
 };
 
 #define SHOST_TO_SAS_HA(_shost) (*(struct sas_ha_struct **)(_shost)->hostdata)
-Original file line number
+Diff line change
@@ Expand Up / @@ -146,6 +146,7 @@ int sas_register_ha(struct sas_ha_struct *sas_ha) @@
     	}
     	INIT_LIST_HEAD(&sas_ha->eh_done_q);
+    	INIT_LIST_HEAD(&sas_ha->eh_ata_q);
     	return 0;
@@ Expand Down @@