[SCSI] mpt2sas: setting SDEV into RUNNING state from Interrupt context

Changing SDEV Running state from interrupt context. Previously It was
handle in work queue thread. With this change It will not wait for work
queue thread to execute scsih_ublock_io_device to put SDEV into Running
state. This will reduce delay for Device becoming RUNNING.

Modified this patch considering James comment "Not to change SDEV state
using  scsi_device_set_state API, instead use scsi_internal_device_unblock
scsi_internal_device_block API"

Signed-off-by: Kashyap Desai <kashyap.desai@lsi.com>
Reviewed-by: Eric Moore <Eric.moore@lsi.com>
Cc: Stable Tree <stable@kernel.org>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

2 files changed, 13 insertions, 6 deletions

diff --git a/drivers/scsi/mpt2sas/mpt2sas_base.h b/drivers/scsi/mpt2sas/mpt2sas_base.h
index 39dc696..1f3efd6 100644
--- a/drivers/scsi/mpt2sas/mpt2sas_base.h
+++ b/drivers/scsi/mpt2sas/mpt2sas_base.h
@@ -802,5 +802,7 @@ void mpt2sas_transport_update_links(struct MPT2SAS_ADAPTER *ioc, u16 handle,
    u16 attached_handle, u8 phy_number, u8 link_rate);
 extern struct sas_function_template mpt2sas_transport_functions;
 extern struct scsi_transport_template *mpt2sas_transport_template;
+extern int scsi_internal_device_block(struct scsi_device *sdev);
+extern int scsi_internal_device_unblock(struct scsi_device *sdev);
 
 #endif /* MPT2SAS_BASE_H_INCLUDED */
diff --git a/drivers/scsi/mpt2sas/mpt2sas_scsih.c b/drivers/scsi/mpt2sas/mpt2sas_scsih.c
index c0d5d5e..6e6d5af 100644
--- a/drivers/scsi/mpt2sas/mpt2sas_scsih.c
+++ b/drivers/scsi/mpt2sas/mpt2sas_scsih.c
@@ -2222,7 +2222,7 @@ _scsih_ublock_io_device(struct MPT2SAS_ADAPTER *ioc, u16 handle)
 			    MPT2SAS_INFO_FMT "SDEV_RUNNING: "
 			    "handle(0x%04x)\n", ioc->name, handle));
 			sas_device_priv_data->block = 0;
-			scsi_device_set_state(sdev, SDEV_RUNNING);
+			scsi_internal_device_unblock(sdev);
 		}
 	}
 }
@@ -2251,7 +2251,7 @@ _scsih_block_io_device(struct MPT2SAS_ADAPTER *ioc, u16 handle)
 			    MPT2SAS_INFO_FMT "SDEV_BLOCK: "
 			    "handle(0x%04x)\n", ioc->name, handle));
 			sas_device_priv_data->block = 1;
-			scsi_device_set_state(sdev, SDEV_BLOCK);
+			scsi_internal_device_block(sdev);
 		}
 	}
 }
@@ -2327,6 +2327,7 @@ _scsih_block_io_to_children_attached_directly(struct MPT2SAS_ADAPTER *ioc,
 	u16 handle;
 	u16 reason_code;
 	u8 phy_number;
+	u8 link_rate;
 
 	for (i = 0; i < event_data->NumEntries; i++) {
 		handle = le16_to_cpu(event_data->PHY[i].AttachedDevHandle);
@@ -2337,6 +2338,11 @@ _scsih_block_io_to_children_attached_directly(struct MPT2SAS_ADAPTER *ioc,
 		    MPI2_EVENT_SAS_TOPO_RC_MASK;
 		if (reason_code == MPI2_EVENT_SAS_TOPO_RC_DELAY_NOT_RESPONDING)
 			_scsih_block_io_device(ioc, handle);
+		if (reason_code == MPI2_EVENT_SAS_TOPO_RC_PHY_CHANGED) {
+			link_rate = event_data->PHY[i].LinkRate >> 4;
+			if (link_rate >= MPI2_SAS_NEG_LINK_RATE_1_5)
+				_scsih_ublock_io_device(ioc, handle);
+		}
 	}
 }
 
@@ -3690,6 +3696,9 @@ _scsih_remove_device(struct MPT2SAS_ADAPTER *ioc, u16 handle)
 	    le32_to_cpu(mpi_reply.IOCLogInfo)));
 
  out:
+
+	_scsih_ublock_io_device(ioc, handle);
+
 	mpt2sas_transport_port_remove(ioc, sas_device->sas_address,
 	    sas_device->parent_handle);
 
@@ -3871,10 +3880,6 @@ _scsih_sas_topology_change_event(struct MPT2SAS_ADAPTER *ioc, u8 VF_ID,
 						link_rate_);
 				}
 			}
-			if (reason_code == MPI2_EVENT_SAS_TOPO_RC_PHY_CHANGED) {
-				if (link_rate_ >= MPI2_SAS_NEG_LINK_RATE_1_5)
-					_scsih_ublock_io_device(ioc, handle);
-			}
 			if (reason_code == MPI2_EVENT_SAS_TOPO_RC_TARG_ADDED) {
 				if (link_rate_ < MPI2_SAS_NEG_LINK_RATE_1_5)
 					break;