8 files changed, 108 insertions, 71 deletions

diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c
index 749836668655..3f62dd50bbbe 100644
--- a/drivers/s390/block/dasd.c
+++ b/drivers/s390/block/dasd.c
@@ -2135,9 +2135,9 @@ static int dasd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
         struct dasd_device *base;
 
         block = bdev->bd_disk->private_data;
-        base = block->base;
         if (!block)
                 return -ENODEV;
+        base = block->base;
 
         if (!base->discipline ||
             !base->discipline->fill_geometry)
diff --git a/drivers/s390/cio/device.c b/drivers/s390/cio/device.c
index 3c57c1a18bb8..d593bc76afe3 100644
--- a/drivers/s390/cio/device.c
+++ b/drivers/s390/cio/device.c
@@ -772,10 +772,8 @@ static struct ccw_device * io_subchannel_create_ccwdev(struct subchannel *sch)
         cdev = io_subchannel_allocate_dev(sch);
         if (!IS_ERR(cdev)) {
                 ret = io_subchannel_initialize_dev(sch, cdev);
-                if (ret) {
-                        kfree(cdev);
+                if (ret)
                         cdev = ERR_PTR(ret);
-                }
         }
         return cdev;
 }
diff --git a/drivers/s390/crypto/ap_bus.c b/drivers/s390/crypto/ap_bus.c
index 727a809636d8..ed3dcdea7fe1 100644
--- a/drivers/s390/crypto/ap_bus.c
+++ b/drivers/s390/crypto/ap_bus.c
@@ -1145,12 +1145,17 @@ ap_config_timeout(unsigned long ptr)
  */
 static inline void ap_schedule_poll_timer(void)
 {
+        ktime_t hr_time;
         if (ap_using_interrupts() || ap_suspend_flag)
                 return;
         if (hrtimer_is_queued(&ap_poll_timer))
                 return;
-        hrtimer_start(&ap_poll_timer, ktime_set(0, poll_timeout),
-                      HRTIMER_MODE_ABS);
+        if (ktime_to_ns(hrtimer_expires_remaining(&ap_poll_timer)) <= 0) {
+                hr_time = ktime_set(0, poll_timeout);
+                hrtimer_forward_now(&ap_poll_timer, hr_time);
+                hrtimer_restart(&ap_poll_timer);
+        }
+        return;
 }
 
 /**
diff --git a/drivers/s390/scsi/zfcp_erp.c b/drivers/s390/scsi/zfcp_erp.c
index 8030e25152fb..c75d6f35cb5f 100644
--- a/drivers/s390/scsi/zfcp_erp.c
+++ b/drivers/s390/scsi/zfcp_erp.c
@@ -553,40 +553,35 @@ static void _zfcp_erp_unit_reopen_all(struct zfcp_port *port, int clear,
                 _zfcp_erp_unit_reopen(unit, clear, id, ref);
 }
 
-static void zfcp_erp_strategy_followup_actions(struct zfcp_erp_action *act)
+static void zfcp_erp_strategy_followup_failed(struct zfcp_erp_action *act)
 {
-        struct zfcp_adapter *adapter = act->adapter;
-        struct zfcp_port *port = act->port;
-        struct zfcp_unit *unit = act->unit;
-        u32 status = act->status;
-
-        /* initiate follow-up actions depending on success of finished action */
         switch (act->action) {
-
         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
-                if (status == ZFCP_ERP_SUCCEEDED)
-                        _zfcp_erp_port_reopen_all(adapter, 0, "ersfa_1", NULL);
-                else
-                        _zfcp_erp_adapter_reopen(adapter, 0, "ersfa_2", NULL);
+                _zfcp_erp_adapter_reopen(act->adapter, 0, "ersff_1", NULL);
                 break;
-
         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
-                if (status == ZFCP_ERP_SUCCEEDED)
-                        _zfcp_erp_port_reopen(port, 0, "ersfa_3", NULL);
-                else
-                        _zfcp_erp_adapter_reopen(adapter, 0, "ersfa_4", NULL);
+                _zfcp_erp_port_forced_reopen(act->port, 0, "ersff_2", NULL);
                 break;
-
         case ZFCP_ERP_ACTION_REOPEN_PORT:
-                if (status == ZFCP_ERP_SUCCEEDED)
-                        _zfcp_erp_unit_reopen_all(port, 0, "ersfa_5", NULL);
-                else
-                        _zfcp_erp_port_forced_reopen(port, 0, "ersfa_6", NULL);
+                _zfcp_erp_port_reopen(act->port, 0, "ersff_3", NULL);
                 break;
-
         case ZFCP_ERP_ACTION_REOPEN_UNIT:
-                if (status != ZFCP_ERP_SUCCEEDED)
-                        _zfcp_erp_port_reopen(unit->port, 0, "ersfa_7", NULL);
+                _zfcp_erp_unit_reopen(act->unit, 0, "ersff_4", NULL);
+                break;
+        }
+}
+
+static void zfcp_erp_strategy_followup_success(struct zfcp_erp_action *act)
+{
+        switch (act->action) {
+        case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
+                _zfcp_erp_port_reopen_all(act->adapter, 0, "ersfs_1", NULL);
+                break;
+        case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
+                _zfcp_erp_port_reopen(act->port, 0, "ersfs_2", NULL);
+                break;
+        case ZFCP_ERP_ACTION_REOPEN_PORT:
+                _zfcp_erp_unit_reopen_all(act->port, 0, "ersfs_3", NULL);
                 break;
         }
 }
@@ -801,7 +796,7 @@ static int zfcp_erp_port_forced_strategy(struct zfcp_erp_action *erp_action)
                         return ZFCP_ERP_FAILED;
 
         case ZFCP_ERP_STEP_PHYS_PORT_CLOSING:
-                if (status & ZFCP_STATUS_PORT_PHYS_OPEN)
+                if (!(status & ZFCP_STATUS_PORT_PHYS_OPEN))
                         return ZFCP_ERP_SUCCEEDED;
         }
         return ZFCP_ERP_FAILED;
@@ -853,11 +848,17 @@ void zfcp_erp_port_strategy_open_lookup(struct work_struct *work)
                                               gid_pn_work);
 
         retval = zfcp_fc_ns_gid_pn(&port->erp_action);
-        if (retval == -ENOMEM)
-                zfcp_erp_notify(&port->erp_action, ZFCP_ERP_NOMEM);
-        port->erp_action.step = ZFCP_ERP_STEP_NAMESERVER_LOOKUP;
-        if (retval)
-                zfcp_erp_notify(&port->erp_action, ZFCP_ERP_FAILED);
+        if (!retval) {
+                port->erp_action.step = ZFCP_ERP_STEP_NAMESERVER_LOOKUP;
+                goto out;
+        }
+        if (retval == -ENOMEM) {
+                zfcp_erp_notify(&port->erp_action, ZFCP_STATUS_ERP_LOWMEM);
+                goto out;
+        }
+        /* all other error condtions */
+        zfcp_erp_notify(&port->erp_action, 0);
+out:
         zfcp_port_put(port);
 }
 
@@ -1289,7 +1290,10 @@ static int zfcp_erp_strategy(struct zfcp_erp_action *erp_action)
         retval = zfcp_erp_strategy_statechange(erp_action, retval);
         if (retval == ZFCP_ERP_EXIT)
                 goto unlock;
-        zfcp_erp_strategy_followup_actions(erp_action);
+        if (retval == ZFCP_ERP_SUCCEEDED)
+                zfcp_erp_strategy_followup_success(erp_action);
+        if (retval == ZFCP_ERP_FAILED)
+                zfcp_erp_strategy_followup_failed(erp_action);
 
  unlock:
         write_unlock(&adapter->erp_lock);
diff --git a/drivers/s390/scsi/zfcp_fc.c b/drivers/s390/scsi/zfcp_fc.c
index 2f0705d76b72..47daebfa7e59 100644
--- a/drivers/s390/scsi/zfcp_fc.c
+++ b/drivers/s390/scsi/zfcp_fc.c
@@ -79,11 +79,9 @@ static int zfcp_wka_port_get(struct zfcp_wka_port *wka_port)
 
         mutex_unlock(&wka_port->mutex);
 
-        wait_event_timeout(
-                wka_port->completion_wq,
-                wka_port->status == ZFCP_WKA_PORT_ONLINE ||
-                wka_port->status == ZFCP_WKA_PORT_OFFLINE,
-                HZ >> 1);
+        wait_event(wka_port->completion_wq,
+                   wka_port->status == ZFCP_WKA_PORT_ONLINE ||
+                   wka_port->status == ZFCP_WKA_PORT_OFFLINE);
 
         if (wka_port->status == ZFCP_WKA_PORT_ONLINE) {
                 atomic_inc(&wka_port->refcount);
diff --git a/drivers/s390/scsi/zfcp_fsf.c b/drivers/s390/scsi/zfcp_fsf.c
index c57658f3d34f..47795fbf081f 100644
--- a/drivers/s390/scsi/zfcp_fsf.c
+++ b/drivers/s390/scsi/zfcp_fsf.c
@@ -670,8 +670,11 @@ static int zfcp_fsf_req_sbal_get(struct zfcp_adapter *adapter)
                                zfcp_fsf_sbal_check(adapter), 5 * HZ);
         if (ret > 0)
                 return 0;
-        if (!ret)
+        if (!ret) {
                 atomic_inc(&adapter->qdio_outb_full);
+                /* assume hanging outbound queue, try queue recovery */
+                zfcp_erp_adapter_reopen(adapter, 0, "fsrsg_1", NULL);
+        }
 
         spin_lock_bh(&adapter->req_q_lock);
         return -EIO;
@@ -722,7 +725,7 @@ static struct zfcp_fsf_req *zfcp_fsf_req_create(struct zfcp_adapter *adapter,
                 req = zfcp_fsf_alloc_qtcb(pool);
 
         if (unlikely(!req))
-                return ERR_PTR(-EIO);
+                return ERR_PTR(-ENOMEM);
 
         if (adapter->req_no == 0)
                 adapter->req_no++;
@@ -1010,6 +1013,23 @@ skip_fsfstatus:
                 send_ct->handler(send_ct->handler_data);
 }
 
+static void zfcp_fsf_setup_ct_els_unchained(struct qdio_buffer_element *sbale,
+                                            struct scatterlist *sg_req,
+                                            struct scatterlist *sg_resp)
+{
+        sbale[0].flags |= SBAL_FLAGS0_TYPE_WRITE_READ;
+        sbale[2].addr   = sg_virt(sg_req);
+        sbale[2].length = sg_req->length;
+        sbale[3].addr   = sg_virt(sg_resp);
+        sbale[3].length = sg_resp->length;
+        sbale[3].flags |= SBAL_FLAGS_LAST_ENTRY;
+}
+
+static int zfcp_fsf_one_sbal(struct scatterlist *sg)
+{
+        return sg_is_last(sg) && sg->length <= PAGE_SIZE;
+}
+
 static int zfcp_fsf_setup_ct_els_sbals(struct zfcp_fsf_req *req,
                                        struct scatterlist *sg_req,
                                        struct scatterlist *sg_resp,
@@ -1020,30 +1040,30 @@ static int zfcp_fsf_setup_ct_els_sbals(struct zfcp_fsf_req *req,
         int bytes;
 
         if (!(feat & FSF_FEATURE_ELS_CT_CHAINED_SBALS)) {
-                if (sg_req->length > PAGE_SIZE || sg_resp->length > PAGE_SIZE ||
-                    !sg_is_last(sg_req) || !sg_is_last(sg_resp))
+                if (!zfcp_fsf_one_sbal(sg_req) || !zfcp_fsf_one_sbal(sg_resp))
                         return -EOPNOTSUPP;
 
-                sbale[0].flags |= SBAL_FLAGS0_TYPE_WRITE_READ;
-                sbale[2].addr   = sg_virt(sg_req);
-                sbale[2].length = sg_req->length;
-                sbale[3].addr   = sg_virt(sg_resp);
-                sbale[3].length = sg_resp->length;
-                sbale[3].flags |= SBAL_FLAGS_LAST_ENTRY;
+                zfcp_fsf_setup_ct_els_unchained(sbale, sg_req, sg_resp);
+                return 0;
+        }
+
+        /* use single, unchained SBAL if it can hold the request */
+        if (zfcp_fsf_one_sbal(sg_req) && zfcp_fsf_one_sbal(sg_resp)) {
+                zfcp_fsf_setup_ct_els_unchained(sbale, sg_req, sg_resp);
                 return 0;
         }
 
         bytes = zfcp_qdio_sbals_from_sg(req, SBAL_FLAGS0_TYPE_WRITE_READ,
                                         sg_req, max_sbals);
         if (bytes <= 0)
-                return -ENOMEM;
+                return -EIO;
         req->qtcb->bottom.support.req_buf_length = bytes;
         req->sbale_curr = ZFCP_LAST_SBALE_PER_SBAL;
 
         bytes = zfcp_qdio_sbals_from_sg(req, SBAL_FLAGS0_TYPE_WRITE_READ,
                                         sg_resp, max_sbals);
         if (bytes <= 0)
-                return -ENOMEM;
+                return -EIO;
         req->qtcb->bottom.support.resp_buf_length = bytes;
 
         return 0;
@@ -1607,10 +1627,10 @@ static void zfcp_fsf_open_wka_port_handler(struct zfcp_fsf_req *req)
         case FSF_ACCESS_DENIED:
                 wka_port->status = ZFCP_WKA_PORT_OFFLINE;
                 break;
-        case FSF_PORT_ALREADY_OPEN:
-                break;
         case FSF_GOOD:
                 wka_port->handle = header->port_handle;
+                /* fall through */
+        case FSF_PORT_ALREADY_OPEN:
                 wka_port->status = ZFCP_WKA_PORT_ONLINE;
         }
 out:
@@ -1731,15 +1751,16 @@ static void zfcp_fsf_close_physical_port_handler(struct zfcp_fsf_req *req)
                 zfcp_fsf_access_denied_port(req, port);
                 break;
         case FSF_PORT_BOXED:
-                zfcp_erp_port_boxed(port, "fscpph2", req);
-                req->status |= ZFCP_STATUS_FSFREQ_ERROR |
-                               ZFCP_STATUS_FSFREQ_RETRY;
                 /* can't use generic zfcp_erp_modify_port_status because
                  * ZFCP_STATUS_COMMON_OPEN must not be reset for the port */
                 atomic_clear_mask(ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
                 list_for_each_entry(unit, &port->unit_list_head, list)
                         atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN,
                                           &unit->status);
+                zfcp_erp_port_boxed(port, "fscpph2", req);
+                req->status |= ZFCP_STATUS_FSFREQ_ERROR |
+                               ZFCP_STATUS_FSFREQ_RETRY;
+
                 break;
         case FSF_ADAPTER_STATUS_AVAILABLE:
                 switch (header->fsf_status_qual.word[0]) {
@@ -2541,7 +2562,6 @@ struct zfcp_fsf_req *zfcp_fsf_control_file(struct zfcp_adapter *adapter,
         bytes = zfcp_qdio_sbals_from_sg(req, direction, fsf_cfdc->sg,
                                         FSF_MAX_SBALS_PER_REQ);
         if (bytes != ZFCP_CFDC_MAX_SIZE) {
-                retval = -ENOMEM;
                 zfcp_fsf_req_free(req);
                 goto out;
         }
diff --git a/drivers/s390/scsi/zfcp_scsi.c b/drivers/s390/scsi/zfcp_scsi.c
index 967ede73f4c5..6925a1784682 100644
--- a/drivers/s390/scsi/zfcp_scsi.c
+++ b/drivers/s390/scsi/zfcp_scsi.c
@@ -167,20 +167,21 @@ static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
         struct zfcp_unit *unit = scpnt->device->hostdata;
         struct zfcp_fsf_req *old_req, *abrt_req;
         unsigned long flags;
-        unsigned long old_req_id = (unsigned long) scpnt->host_scribble;
+        unsigned long old_reqid = (unsigned long) scpnt->host_scribble;
         int retval = SUCCESS;
         int retry = 3;
+        char *dbf_tag;
 
         /* avoid race condition between late normal completion and abort */
         write_lock_irqsave(&adapter->abort_lock, flags);
 
         spin_lock(&adapter->req_list_lock);
-        old_req = zfcp_reqlist_find(adapter, old_req_id);
+        old_req = zfcp_reqlist_find(adapter, old_reqid);
         spin_unlock(&adapter->req_list_lock);
         if (!old_req) {
                 write_unlock_irqrestore(&adapter->abort_lock, flags);
                 zfcp_scsi_dbf_event_abort("lte1", adapter, scpnt, NULL,
-                                          old_req_id);
+                                          old_reqid);
                 return FAILED; /* completion could be in progress */
         }
         old_req->data = NULL;
@@ -189,7 +190,7 @@ static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
         write_unlock_irqrestore(&adapter->abort_lock, flags);
 
         while (retry--) {
-                abrt_req = zfcp_fsf_abort_fcp_command(old_req_id, unit);
+                abrt_req = zfcp_fsf_abort_fcp_command(old_reqid, unit);
                 if (abrt_req)
                         break;
 
@@ -197,7 +198,7 @@ static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
                 if (!(atomic_read(&adapter->status) &
                       ZFCP_STATUS_COMMON_RUNNING)) {
                         zfcp_scsi_dbf_event_abort("nres", adapter, scpnt, NULL,
-                                                  old_req_id);
+                                                  old_reqid);
                         return SUCCESS;
                 }
         }
@@ -208,13 +209,14 @@ static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
                    abrt_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
 
         if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED)
-                zfcp_scsi_dbf_event_abort("okay", adapter, scpnt, abrt_req, 0);
+                dbf_tag = "okay";
         else if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED)
-                zfcp_scsi_dbf_event_abort("lte2", adapter, scpnt, abrt_req, 0);
+                dbf_tag = "lte2";
         else {
-                zfcp_scsi_dbf_event_abort("fail", adapter, scpnt, abrt_req, 0);
+                dbf_tag = "fail";
                 retval = FAILED;
         }
+        zfcp_scsi_dbf_event_abort(dbf_tag, adapter, scpnt, abrt_req, old_reqid);
         zfcp_fsf_req_free(abrt_req);
         return retval;
 }
@@ -534,6 +536,9 @@ static void zfcp_scsi_rport_register(struct zfcp_port *port)
         struct fc_rport_identifiers ids;
         struct fc_rport *rport;
 
+        if (port->rport)
+                return;
+
         ids.node_name = port->wwnn;
         ids.port_name = port->wwpn;
         ids.port_id = port->d_id;
@@ -557,8 +562,10 @@ static void zfcp_scsi_rport_block(struct zfcp_port *port)
 {
         struct fc_rport *rport = port->rport;
 
-        if (rport)
+        if (rport) {
                 fc_remote_port_delete(rport);
+                port->rport = NULL;
+        }
 }
 
 void zfcp_scsi_schedule_rport_register(struct zfcp_port *port)
diff --git a/drivers/s390/scsi/zfcp_sysfs.c b/drivers/s390/scsi/zfcp_sysfs.c
index 3e51e64d1108..0fe5cce818cb 100644
--- a/drivers/s390/scsi/zfcp_sysfs.c
+++ b/drivers/s390/scsi/zfcp_sysfs.c
@@ -494,9 +494,14 @@ static ssize_t zfcp_sysfs_adapter_q_full_show(struct device *dev,
         struct Scsi_Host *scsi_host = class_to_shost(dev);
         struct zfcp_adapter *adapter =
                 (struct zfcp_adapter *) scsi_host->hostdata[0];
+        u64 util;
+
+        spin_lock_bh(&adapter->qdio_stat_lock);
+        util = adapter->req_q_util;
+        spin_unlock_bh(&adapter->qdio_stat_lock);
 
         return sprintf(buf, "%d %llu\n", atomic_read(&adapter->qdio_outb_full),
-                       (unsigned long long)adapter->req_q_util);
+                       (unsigned long long)util);
 }
 static DEVICE_ATTR(queue_full, S_IRUGO, zfcp_sysfs_adapter_q_full_show, NULL);