[SCSI] mpt2sas: Return DID_TRANSPORT_DISRUPTED in nexus loss,SCSI_MLQUEUE_DEVICE_BUSY...

1 Its observed that the OS was sending request to the driver after it had been
put into blocking state, so the driver was modified to return
SCSI_MLQUEUE_DEVICE_BUSY.
2. Driver will return DID_TRANSPORT_DISRUPTED when sdev is haivng nexus loss.
This occurrs when sdev is blocked, between the
MPI2_EVENT_SAS_TOPO_RC_DELAY_NOT_RESPONDING and
MPI2_EVENT_SAS_TOPO_RC_TARG_NOT_RESPONDING events.

Signed-off-by: Kashyap Desai <kashyap.desai@lsi.com>
Signed-off-by: Eric Moore <Eric.moore@lsi.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

diff --git a/drivers/scsi/mpt2sas/mpt2sas_scsih.c b/drivers/scsi/mpt2sas/mpt2sas_scsih.c
index c20c1e8..b5531a2 100644 (file)
--- a/drivers/scsi/mpt2sas/mpt2sas_scsih.c
+++ b/drivers/scsi/mpt2sas/mpt2sas_scsih.c
@@ -2885,7 +2885,7 @@ _scsih_qcmd(struct scsi_cmnd *scmd, void (*done)(struct scsi_cmnd *))
        }
 
        /* see if we are busy with task managment stuff */
-       if (sas_target_priv_data->tm_busy)
+       if (sas_device_priv_data->block || sas_target_priv_data->tm_busy)
                return SCSI_MLQUEUE_DEVICE_BUSY;
        else if (ioc->shost_recovery || ioc->ioc_link_reset_in_progress)
                return SCSI_MLQUEUE_HOST_BUSY;
@@ -3351,10 +3351,9 @@ _scsih_io_done(struct MPT2SAS_ADAPTER *ioc, u16 smid, u8 msix_index, u32 reply)
 
        case MPI2_IOCSTATUS_SCSI_IOC_TERMINATED:
                if (sas_device_priv_data->block) {
-                       scmd->result = (DID_BUS_BUSY << 16);
-                       break;
+                       scmd->result = DID_TRANSPORT_DISRUPTED << 16;
+                       goto out;
                }
-
        case MPI2_IOCSTATUS_SCSI_TASK_TERMINATED:
        case MPI2_IOCSTATUS_SCSI_EXT_TERMINATED:
                scmd->result = DID_RESET << 16;