11 files changed, 87 insertions, 85 deletions

diff --git a/drivers/s390/scsi/zfcp_ccw.c b/drivers/s390/scsi/zfcp_ccw.c
index 391dd29749f8..51b6a05f4d12 100644
--- a/drivers/s390/scsi/zfcp_ccw.c
+++ b/drivers/s390/scsi/zfcp_ccw.c
@@ -152,10 +152,8 @@ static int zfcp_ccw_set_offline(struct ccw_device *ccw_device)
  */
 static int zfcp_ccw_notify(struct ccw_device *ccw_device, int event)
 {
-        struct zfcp_adapter *adapter;
+        struct zfcp_adapter *adapter = dev_get_drvdata(&ccw_device->dev);
 
-        down(&zfcp_data.config_sema);
-        adapter = dev_get_drvdata(&ccw_device->dev);
         switch (event) {
         case CIO_GONE:
                 dev_warn(&adapter->ccw_device->dev, "device gone\n");
@@ -174,8 +172,6 @@ static int zfcp_ccw_notify(struct ccw_device *ccw_device, int event)
                                         89, NULL);
                 break;
         }
-        zfcp_erp_wait(adapter);
-        up(&zfcp_data.config_sema);
         return 1;
 }
 
diff --git a/drivers/s390/scsi/zfcp_fc.c b/drivers/s390/scsi/zfcp_fc.c
index e984469bb98b..56196c98c07b 100644
--- a/drivers/s390/scsi/zfcp_fc.c
+++ b/drivers/s390/scsi/zfcp_fc.c
@@ -39,18 +39,6 @@ struct zfcp_gpn_ft {
         struct scatterlist sg_resp[ZFCP_GPN_FT_BUFFERS];
 };
 
-static struct zfcp_port *zfcp_get_port_by_did(struct zfcp_adapter *adapter,
-                                              u32 d_id)
-{
-        struct zfcp_port *port;
-
-        list_for_each_entry(port, &adapter->port_list_head, list)
-                if ((port->d_id == d_id) &&
-                    !atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status))
-                        return port;
-        return NULL;
-}
-
 static void _zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req, u32 range,
                                    struct fcp_rscn_element *elem)
 {
@@ -341,12 +329,13 @@ void zfcp_test_link(struct zfcp_port *port)
 
         zfcp_port_get(port);
         retval = zfcp_fc_adisc(port);
-        if (retval == 0 || retval == -EBUSY)
+        if (retval == 0)
                 return;
 
         /* send of ADISC was not possible */
         zfcp_port_put(port);
-        zfcp_erp_port_forced_reopen(port, 0, 65, NULL);
+        if (retval != -EBUSY)
+                zfcp_erp_port_forced_reopen(port, 0, 65, NULL);
 }
 
 static int zfcp_scan_get_nameserver(struct zfcp_adapter *adapter)
@@ -363,7 +352,6 @@ static int zfcp_scan_get_nameserver(struct zfcp_adapter *adapter)
                 if (ret)
                         return ret;
                 zfcp_erp_wait(adapter);
-                zfcp_port_put(adapter->nameserver_port);
         }
         return !atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED,
                                   &adapter->nameserver_port->status);
@@ -475,7 +463,7 @@ static int zfcp_scan_eval_gpn_ft(struct zfcp_gpn_ft *gpn_ft)
         struct zfcp_adapter *adapter = ct->port->adapter;
         struct zfcp_port *port, *tmp;
         u32 d_id;
-        int ret = 0, x;
+        int ret = 0, x, last = 0;
 
         if (ct->status)
                 return -EIO;
@@ -492,19 +480,24 @@ static int zfcp_scan_eval_gpn_ft(struct zfcp_gpn_ft *gpn_ft)
         down(&zfcp_data.config_sema);
 
         /* first entry is the header */
-        for (x = 1; x < ZFCP_GPN_FT_MAX_ENTRIES; x++) {
+        for (x = 1; x < ZFCP_GPN_FT_MAX_ENTRIES && !last; x++) {
                 if (x % (ZFCP_GPN_FT_ENTRIES + 1))
                         acc++;
                 else
                         acc = sg_virt(++sg);
 
+                last = acc->control & 0x80;
                 d_id = acc->port_id[0] << 16 | acc->port_id[1] << 8 |
                        acc->port_id[2];
 
                 /* skip the adapter's port and known remote ports */
-                if (acc->wwpn == fc_host_port_name(adapter->scsi_host) ||
-                     zfcp_get_port_by_did(adapter, d_id))
+                if (acc->wwpn == fc_host_port_name(adapter->scsi_host))
+                        continue;
+                port = zfcp_get_port_by_wwpn(adapter, acc->wwpn);
+                if (port) {
+                        zfcp_port_get(port);
                         continue;
+                }
 
                 port = zfcp_port_enqueue(adapter, acc->wwpn,
                                          ZFCP_STATUS_PORT_DID_DID |
@@ -513,8 +506,6 @@ static int zfcp_scan_eval_gpn_ft(struct zfcp_gpn_ft *gpn_ft)
                         ret = PTR_ERR(port);
                 else
                         zfcp_erp_port_reopen(port, 0, 149, NULL);
-                if (acc->control & 0x80) /* last entry */
-                        break;
         }
 
         zfcp_erp_wait(adapter);
diff --git a/drivers/s390/scsi/zfcp_fsf.c b/drivers/s390/scsi/zfcp_fsf.c
index 19c1ca913874..49dbeb754e5f 100644
--- a/drivers/s390/scsi/zfcp_fsf.c
+++ b/drivers/s390/scsi/zfcp_fsf.c
@@ -710,10 +710,10 @@ static void zfcp_fsf_exchange_port_data_handler(struct zfcp_fsf_req *req)
 
 static int zfcp_fsf_sbal_check(struct zfcp_qdio_queue *queue)
 {
-        spin_lock(&queue->lock);
+        spin_lock_bh(&queue->lock);
         if (atomic_read(&queue->count))
                 return 1;
-        spin_unlock(&queue->lock);
+        spin_unlock_bh(&queue->lock);
         return 0;
 }
 
@@ -722,13 +722,13 @@ static int zfcp_fsf_req_sbal_get(struct zfcp_adapter *adapter)
         long ret;
         struct zfcp_qdio_queue *req_q = &adapter->req_q;
 
-        spin_unlock(&req_q->lock);
+        spin_unlock_bh(&req_q->lock);
         ret = wait_event_interruptible_timeout(adapter->request_wq,
                                         zfcp_fsf_sbal_check(req_q), 5 * HZ);
         if (ret > 0)
                 return 0;
 
-        spin_lock(&req_q->lock);
+        spin_lock_bh(&req_q->lock);
         return -EIO;
 }
 
@@ -870,14 +870,14 @@ int zfcp_fsf_status_read(struct zfcp_adapter *adapter)
         volatile struct qdio_buffer_element *sbale;
         int retval = -EIO;
 
-        spin_lock(&adapter->req_q.lock);
+        spin_lock_bh(&adapter->req_q.lock);
         if (zfcp_fsf_req_sbal_get(adapter))
                 goto out;
 
         req = zfcp_fsf_req_create(adapter, FSF_QTCB_UNSOLICITED_STATUS,
                                   ZFCP_REQ_NO_QTCB,
                                   adapter->pool.fsf_req_status_read);
-        if (unlikely(IS_ERR(req))) {
+        if (IS_ERR(req)) {
                 retval = PTR_ERR(req);
                 goto out;
         }
@@ -910,7 +910,7 @@ failed_buf:
         zfcp_fsf_req_free(req);
         zfcp_hba_dbf_event_fsf_unsol("fail", adapter, NULL);
 out:
-        spin_unlock(&adapter->req_q.lock);
+        spin_unlock_bh(&adapter->req_q.lock);
         return retval;
 }
 
@@ -988,7 +988,7 @@ struct zfcp_fsf_req *zfcp_fsf_abort_fcp_command(unsigned long old_req_id,
                 goto out;
         req = zfcp_fsf_req_create(adapter, FSF_QTCB_ABORT_FCP_CMND,
                                   req_flags, adapter->pool.fsf_req_abort);
-        if (unlikely(IS_ERR(req)))
+        if (IS_ERR(req))
                 goto out;
 
         if (unlikely(!(atomic_read(&unit->status) &
@@ -1106,13 +1106,13 @@ int zfcp_fsf_send_ct(struct zfcp_send_ct *ct, mempool_t *pool,
         struct zfcp_fsf_req *req;
         int ret = -EIO;
 
-        spin_lock(&adapter->req_q.lock);
+        spin_lock_bh(&adapter->req_q.lock);
         if (zfcp_fsf_req_sbal_get(adapter))
                 goto out;
 
         req = zfcp_fsf_req_create(adapter, FSF_QTCB_SEND_GENERIC,
                                   ZFCP_REQ_AUTO_CLEANUP, pool);
-        if (unlikely(IS_ERR(req))) {
+        if (IS_ERR(req)) {
                 ret = PTR_ERR(req);
                 goto out;
         }
@@ -1148,7 +1148,7 @@ failed_send:
         if (erp_action)
                 erp_action->fsf_req = NULL;
 out:
-        spin_unlock(&adapter->req_q.lock);
+        spin_unlock_bh(&adapter->req_q.lock);
         return ret;
 }
 
@@ -1223,7 +1223,7 @@ int zfcp_fsf_send_els(struct zfcp_send_els *els)
                 goto out;
         req = zfcp_fsf_req_create(adapter, FSF_QTCB_SEND_ELS,
                                   ZFCP_REQ_AUTO_CLEANUP, NULL);
-        if (unlikely(IS_ERR(req))) {
+        if (IS_ERR(req)) {
                 ret = PTR_ERR(req);
                 goto out;
         }
@@ -1263,14 +1263,14 @@ int zfcp_fsf_exchange_config_data(struct zfcp_erp_action *erp_action)
         struct zfcp_adapter *adapter = erp_action->adapter;
         int retval = -EIO;
 
-        spin_lock(&adapter->req_q.lock);
+        spin_lock_bh(&adapter->req_q.lock);
         if (!atomic_read(&adapter->req_q.count))
                 goto out;
         req = zfcp_fsf_req_create(adapter,
                                   FSF_QTCB_EXCHANGE_CONFIG_DATA,
                                   ZFCP_REQ_AUTO_CLEANUP,
                                   adapter->pool.fsf_req_erp);
-        if (unlikely(IS_ERR(req))) {
+        if (IS_ERR(req)) {
                 retval = PTR_ERR(req);
                 goto out;
         }
@@ -1295,7 +1295,7 @@ int zfcp_fsf_exchange_config_data(struct zfcp_erp_action *erp_action)
                 erp_action->fsf_req = NULL;
         }
 out:
-        spin_unlock(&adapter->req_q.lock);
+        spin_unlock_bh(&adapter->req_q.lock);
         return retval;
 }
 
@@ -1306,13 +1306,13 @@ int zfcp_fsf_exchange_config_data_sync(struct zfcp_adapter *adapter,
         struct zfcp_fsf_req *req = NULL;
         int retval = -EIO;
 
-        spin_lock(&adapter->req_q.lock);
+        spin_lock_bh(&adapter->req_q.lock);
         if (zfcp_fsf_req_sbal_get(adapter))
                 goto out;
 
         req = zfcp_fsf_req_create(adapter, FSF_QTCB_EXCHANGE_CONFIG_DATA,
                                   0, NULL);
-        if (unlikely(IS_ERR(req))) {
+        if (IS_ERR(req)) {
                 retval = PTR_ERR(req);
                 goto out;
         }
@@ -1334,7 +1334,7 @@ int zfcp_fsf_exchange_config_data_sync(struct zfcp_adapter *adapter,
         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
         retval = zfcp_fsf_req_send(req);
 out:
-        spin_unlock(&adapter->req_q.lock);
+        spin_unlock_bh(&adapter->req_q.lock);
         if (!retval)
                 wait_event(req->completion_wq,
                            req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
@@ -1359,13 +1359,13 @@ int zfcp_fsf_exchange_port_data(struct zfcp_erp_action *erp_action)
         if (!(adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT))
                 return -EOPNOTSUPP;
 
-        spin_lock(&adapter->req_q.lock);
+        spin_lock_bh(&adapter->req_q.lock);
         if (!atomic_read(&adapter->req_q.count))
                 goto out;
         req = zfcp_fsf_req_create(adapter, FSF_QTCB_EXCHANGE_PORT_DATA,
                                   ZFCP_REQ_AUTO_CLEANUP,
                                   adapter->pool.fsf_req_erp);
-        if (unlikely(IS_ERR(req))) {
+        if (IS_ERR(req)) {
                 retval = PTR_ERR(req);
                 goto out;
         }
@@ -1385,7 +1385,7 @@ int zfcp_fsf_exchange_port_data(struct zfcp_erp_action *erp_action)
                 erp_action->fsf_req = NULL;
         }
 out:
-        spin_unlock(&adapter->req_q.lock);
+        spin_unlock_bh(&adapter->req_q.lock);
         return retval;
 }
 
@@ -1405,13 +1405,13 @@ int zfcp_fsf_exchange_port_data_sync(struct zfcp_adapter *adapter,
         if (!(adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT))
                 return -EOPNOTSUPP;
 
-        spin_lock(&adapter->req_q.lock);
+        spin_lock_bh(&adapter->req_q.lock);
         if (!atomic_read(&adapter->req_q.count))
                 goto out;
 
         req = zfcp_fsf_req_create(adapter, FSF_QTCB_EXCHANGE_PORT_DATA, 0,
                                   NULL);
-        if (unlikely(IS_ERR(req))) {
+        if (IS_ERR(req)) {
                 retval = PTR_ERR(req);
                 goto out;
         }
@@ -1427,7 +1427,7 @@ int zfcp_fsf_exchange_port_data_sync(struct zfcp_adapter *adapter,
         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
         retval = zfcp_fsf_req_send(req);
 out:
-        spin_unlock(&adapter->req_q.lock);
+        spin_unlock_bh(&adapter->req_q.lock);
         if (!retval)
                 wait_event(req->completion_wq,
                            req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
@@ -1531,7 +1531,7 @@ int zfcp_fsf_open_port(struct zfcp_erp_action *erp_action)
         struct zfcp_fsf_req *req;
         int retval = -EIO;
 
-        spin_lock(&adapter->req_q.lock);
+        spin_lock_bh(&adapter->req_q.lock);
         if (zfcp_fsf_req_sbal_get(adapter))
                 goto out;
 
@@ -1539,7 +1539,7 @@ int zfcp_fsf_open_port(struct zfcp_erp_action *erp_action)
                                   FSF_QTCB_OPEN_PORT_WITH_DID,
                                   ZFCP_REQ_AUTO_CLEANUP,
                                   adapter->pool.fsf_req_erp);
-        if (unlikely(IS_ERR(req))) {
+        if (IS_ERR(req)) {
                 retval = PTR_ERR(req);
                 goto out;
         }
@@ -1562,7 +1562,7 @@ int zfcp_fsf_open_port(struct zfcp_erp_action *erp_action)
                 erp_action->fsf_req = NULL;
         }
 out:
-        spin_unlock(&adapter->req_q.lock);
+        spin_unlock_bh(&adapter->req_q.lock);
         return retval;
 }
 
@@ -1603,14 +1603,14 @@ int zfcp_fsf_close_port(struct zfcp_erp_action *erp_action)
         struct zfcp_fsf_req *req;
         int retval = -EIO;
 
-        spin_lock(&adapter->req_q.lock);
+        spin_lock_bh(&adapter->req_q.lock);
         if (zfcp_fsf_req_sbal_get(adapter))
                 goto out;
 
         req = zfcp_fsf_req_create(adapter, FSF_QTCB_CLOSE_PORT,
                                   ZFCP_REQ_AUTO_CLEANUP,
                                   adapter->pool.fsf_req_erp);
-        if (unlikely(IS_ERR(req))) {
+        if (IS_ERR(req)) {
                 retval = PTR_ERR(req);
                 goto out;
         }
@@ -1633,7 +1633,7 @@ int zfcp_fsf_close_port(struct zfcp_erp_action *erp_action)
                 erp_action->fsf_req = NULL;
         }
 out:
-        spin_unlock(&adapter->req_q.lock);
+        spin_unlock_bh(&adapter->req_q.lock);
         return retval;
 }
 
@@ -1700,14 +1700,14 @@ int zfcp_fsf_close_physical_port(struct zfcp_erp_action *erp_action)
         struct zfcp_fsf_req *req;
         int retval = -EIO;
 
-        spin_lock(&adapter->req_q.lock);
+        spin_lock_bh(&adapter->req_q.lock);
         if (zfcp_fsf_req_sbal_get(adapter))
                 goto out;
 
         req = zfcp_fsf_req_create(adapter, FSF_QTCB_CLOSE_PHYSICAL_PORT,
                                   ZFCP_REQ_AUTO_CLEANUP,
                                   adapter->pool.fsf_req_erp);
-        if (unlikely(IS_ERR(req))) {
+        if (IS_ERR(req)) {
                 retval = PTR_ERR(req);
                 goto out;
         }
@@ -1731,7 +1731,7 @@ int zfcp_fsf_close_physical_port(struct zfcp_erp_action *erp_action)
                 erp_action->fsf_req = NULL;
         }
 out:
-        spin_unlock(&adapter->req_q.lock);
+        spin_unlock_bh(&adapter->req_q.lock);
         return retval;
 }
 
@@ -1875,14 +1875,14 @@ int zfcp_fsf_open_unit(struct zfcp_erp_action *erp_action)
         struct zfcp_fsf_req *req;
         int retval = -EIO;
 
-        spin_lock(&adapter->req_q.lock);
+        spin_lock_bh(&adapter->req_q.lock);
         if (zfcp_fsf_req_sbal_get(adapter))
                 goto out;
 
         req = zfcp_fsf_req_create(adapter, FSF_QTCB_OPEN_LUN,
                                   ZFCP_REQ_AUTO_CLEANUP,
                                   adapter->pool.fsf_req_erp);
-        if (unlikely(IS_ERR(req))) {
+        if (IS_ERR(req)) {
                 retval = PTR_ERR(req);
                 goto out;
         }
@@ -1910,7 +1910,7 @@ int zfcp_fsf_open_unit(struct zfcp_erp_action *erp_action)
                 erp_action->fsf_req = NULL;
         }
 out:
-        spin_unlock(&adapter->req_q.lock);
+        spin_unlock_bh(&adapter->req_q.lock);
         return retval;
 }
 
@@ -1965,13 +1965,13 @@ int zfcp_fsf_close_unit(struct zfcp_erp_action *erp_action)
         struct zfcp_fsf_req *req;
         int retval = -EIO;
 
-        spin_lock(&adapter->req_q.lock);
+        spin_lock_bh(&adapter->req_q.lock);
         if (zfcp_fsf_req_sbal_get(adapter))
                 goto out;
         req = zfcp_fsf_req_create(adapter, FSF_QTCB_CLOSE_LUN,
                                   ZFCP_REQ_AUTO_CLEANUP,
                                   adapter->pool.fsf_req_erp);
-        if (unlikely(IS_ERR(req))) {
+        if (IS_ERR(req)) {
                 retval = PTR_ERR(req);
                 goto out;
         }
@@ -1995,7 +1995,7 @@ int zfcp_fsf_close_unit(struct zfcp_erp_action *erp_action)
                 erp_action->fsf_req = NULL;
         }
 out:
-        spin_unlock(&adapter->req_q.lock);
+        spin_unlock_bh(&adapter->req_q.lock);
         return retval;
 }
 
@@ -2228,7 +2228,7 @@ int zfcp_fsf_send_fcp_command_task(struct zfcp_adapter *adapter,
                 goto out;
         req = zfcp_fsf_req_create(adapter, FSF_QTCB_FCP_CMND, req_flags,
                                   adapter->pool.fsf_req_scsi);
-        if (unlikely(IS_ERR(req))) {
+        if (IS_ERR(req)) {
                 retval = PTR_ERR(req);
                 goto out;
         }
@@ -2351,7 +2351,7 @@ struct zfcp_fsf_req *zfcp_fsf_send_fcp_ctm(struct zfcp_adapter *adapter,
                 goto out;
         req = zfcp_fsf_req_create(adapter, FSF_QTCB_FCP_CMND, req_flags,
                                   adapter->pool.fsf_req_scsi);
-        if (unlikely(IS_ERR(req)))
+        if (IS_ERR(req))
                 goto out;
 
         req->status |= ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT;
@@ -2417,12 +2417,12 @@ struct zfcp_fsf_req *zfcp_fsf_control_file(struct zfcp_adapter *adapter,
                 return ERR_PTR(-EINVAL);
         }
 
-        spin_lock(&adapter->req_q.lock);
+        spin_lock_bh(&adapter->req_q.lock);
         if (zfcp_fsf_req_sbal_get(adapter))
                 goto out;
 
         req = zfcp_fsf_req_create(adapter, fsf_cfdc->command, 0, NULL);
-        if (unlikely(IS_ERR(req))) {
+        if (IS_ERR(req)) {
                 retval = -EPERM;
                 goto out;
         }
@@ -2447,7 +2447,7 @@ struct zfcp_fsf_req *zfcp_fsf_control_file(struct zfcp_adapter *adapter,
         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
         retval = zfcp_fsf_req_send(req);
 out:
-        spin_unlock(&adapter->req_q.lock);
+        spin_unlock_bh(&adapter->req_q.lock);
 
         if (!retval) {
                 wait_event(req->completion_wq,
diff --git a/drivers/s390/scsi/zfcp_qdio.c b/drivers/s390/scsi/zfcp_qdio.c
index d6dbd653fde9..69d632d851d9 100644
--- a/drivers/s390/scsi/zfcp_qdio.c
+++ b/drivers/s390/scsi/zfcp_qdio.c
@@ -423,9 +423,9 @@ void zfcp_qdio_close(struct zfcp_adapter *adapter)
 
         /* clear QDIOUP flag, thus do_QDIO is not called during qdio_shutdown */
         req_q = &adapter->req_q;
-        spin_lock(&req_q->lock);
+        spin_lock_bh(&req_q->lock);
         atomic_clear_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status);
-        spin_unlock(&req_q->lock);
+        spin_unlock_bh(&req_q->lock);
 
         qdio_shutdown(adapter->ccw_device, QDIO_FLAG_CLEANUP_USING_CLEAR);
 
diff --git a/drivers/scsi/Kconfig b/drivers/scsi/Kconfig
index c7f06298bd3c..4e0322b1c1ea 100644
--- a/drivers/scsi/Kconfig
+++ b/drivers/scsi/Kconfig
@@ -63,7 +63,7 @@ comment "SCSI support type (disk, tape, CD-ROM)"
 config BLK_DEV_SD
         tristate "SCSI disk support"
         depends on SCSI
-        select CRC_T10DIF
+        select CRC_T10DIF if BLK_DEV_INTEGRITY
         ---help---
           If you want to use SCSI hard disks, Fibre Channel disks,
           Serial ATA (SATA) or Parallel ATA (PATA) hard disks,
diff --git a/drivers/scsi/device_handler/scsi_dh_alua.c b/drivers/scsi/device_handler/scsi_dh_alua.c
index 994da56fffed..708e475896b9 100644
--- a/drivers/scsi/device_handler/scsi_dh_alua.c
+++ b/drivers/scsi/device_handler/scsi_dh_alua.c
@@ -425,7 +425,7 @@ static int alua_check_sense(struct scsi_device *sdev,
                         /*
                          * LUN Not Accessible - ALUA state transition
                          */
-                        return NEEDS_RETRY;
+                        return ADD_TO_MLQUEUE;
                 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x0b)
                         /*
                          * LUN Not Accessible -- Target port in standby state
@@ -447,18 +447,18 @@ static int alua_check_sense(struct scsi_device *sdev,
                         /*
                          * Power On, Reset, or Bus Device Reset, just retry.
                          */
-                        return NEEDS_RETRY;
+                        return ADD_TO_MLQUEUE;
                 if (sense_hdr->asc == 0x2a && sense_hdr->ascq == 0x06) {
                         /*
                          * ALUA state changed
                          */
-                        return NEEDS_RETRY;
+                        return ADD_TO_MLQUEUE;
                 }
                 if (sense_hdr->asc == 0x2a && sense_hdr->ascq == 0x07) {
                         /*
                          * Implicit ALUA state transition failed
                          */
-                        return NEEDS_RETRY;
+                        return ADD_TO_MLQUEUE;
                 }
                 break;
         }
@@ -490,7 +490,7 @@ static int alua_stpg(struct scsi_device *sdev, int state,
                 if (!err)
                         return SCSI_DH_IO;
                 err = alua_check_sense(sdev, &sense_hdr);
-                if (retry > 0 && err == NEEDS_RETRY) {
+                if (retry > 0 && err == ADD_TO_MLQUEUE) {
                         retry--;
                         goto retry;
                 }
@@ -535,7 +535,7 @@ static int alua_rtpg(struct scsi_device *sdev, struct alua_dh_data *h)
                         return SCSI_DH_IO;
 
                 err = alua_check_sense(sdev, &sense_hdr);
-                if (err == NEEDS_RETRY)
+                if (err == ADD_TO_MLQUEUE)
                         goto retry;
                 sdev_printk(KERN_INFO, sdev,
                             "%s: rtpg sense code %02x/%02x/%02x\n",
diff --git a/drivers/scsi/device_handler/scsi_dh_emc.c b/drivers/scsi/device_handler/scsi_dh_emc.c
index b9d23e9e9a44..ef693e8412e9 100644
--- a/drivers/scsi/device_handler/scsi_dh_emc.c
+++ b/drivers/scsi/device_handler/scsi_dh_emc.c
@@ -439,7 +439,7 @@ static int clariion_check_sense(struct scsi_device *sdev,
                          * Unit Attention Code. This is the first IO
                          * to the new path, so just retry.
                          */
-                        return NEEDS_RETRY;
+                        return ADD_TO_MLQUEUE;
                 break;
         }
 
@@ -514,7 +514,7 @@ retry:
                         return SCSI_DH_IO;
 
                 err = clariion_check_sense(sdev, &sshdr);
-                if (retry > 0 && err == NEEDS_RETRY) {
+                if (retry > 0 && err == ADD_TO_MLQUEUE) {
                         retry--;
                         goto retry;
                 }
diff --git a/drivers/scsi/device_handler/scsi_dh_rdac.c b/drivers/scsi/device_handler/scsi_dh_rdac.c
index 2dee69da35cf..6e2f130d56de 100644
--- a/drivers/scsi/device_handler/scsi_dh_rdac.c
+++ b/drivers/scsi/device_handler/scsi_dh_rdac.c
@@ -551,7 +551,7 @@ static int rdac_check_sense(struct scsi_device *sdev,
                          *
                          * Just retry and wait.
                          */
-                        return NEEDS_RETRY;
+                        return ADD_TO_MLQUEUE;
                 break;
         case ILLEGAL_REQUEST:
                 if (sense_hdr->asc == 0x94 && sense_hdr->ascq == 0x01) {
@@ -568,7 +568,7 @@ static int rdac_check_sense(struct scsi_device *sdev,
                         /*
                          * Power On, Reset, or Bus Device Reset, just retry.
                          */
-                        return NEEDS_RETRY;
+                        return ADD_TO_MLQUEUE;
                 break;
         }
         /* success just means we do not care what scsi-ml does */
diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c
index 880051c89bde..39ce3aba1dac 100644
--- a/drivers/scsi/scsi_error.c
+++ b/drivers/scsi/scsi_error.c
@@ -391,7 +391,7 @@ static int scsi_check_sense(struct scsi_cmnd *scmd)
 
         case HARDWARE_ERROR:
                 if (scmd->device->retry_hwerror)
-                        return NEEDS_RETRY;
+                        return ADD_TO_MLQUEUE;
                 else
                         return SUCCESS;
 
diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c
index 84b4879cff11..34d0de6cd511 100644
--- a/drivers/scsi/scsi_scan.c
+++ b/drivers/scsi/scsi_scan.c
@@ -1080,7 +1080,8 @@ static int scsi_probe_and_add_lun(struct scsi_target *starget,
          * PDT=1Fh none (no FDD connected to the requested logical unit)
          */
         if (((result[0] >> 5) == 1 || starget->pdt_1f_for_no_lun) &&
-             (result[0] & 0x1f) == 0x1f) {
+            (result[0] & 0x1f) == 0x1f &&
+            !scsi_is_wlun(lun)) {
                 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
                                         "scsi scan: peripheral device type"
                                         " of 31, no device added\n"));
diff --git a/include/scsi/scsi.h b/include/scsi/scsi.h
index 5c40cc537d4c..192f8716aa9e 100644
--- a/include/scsi/scsi.h
+++ b/include/scsi/scsi.h
@@ -309,6 +309,20 @@ struct scsi_lun {
 };
 
 /*
+ * The Well Known LUNS (SAM-3) in our int representation of a LUN
+ */
+#define SCSI_W_LUN_BASE 0xc100
+#define SCSI_W_LUN_REPORT_LUNS (SCSI_W_LUN_BASE + 1)
+#define SCSI_W_LUN_ACCESS_CONTROL (SCSI_W_LUN_BASE + 2)
+#define SCSI_W_LUN_TARGET_LOG_PAGE (SCSI_W_LUN_BASE + 3)
+
+static inline int scsi_is_wlun(unsigned int lun)
+{
+        return (lun & 0xff00) == SCSI_W_LUN_BASE;
+}
+
+
+/*
  *  MESSAGE CODES
  */