s390: use free_netdev(netdev) instead of kfree()
[linux-2.6.git] / drivers / s390 / scsi / zfcp_aux.c
1 /*
2  * zfcp device driver
3  *
4  * Module interface and handling of zfcp data structures.
5  *
6  * Copyright IBM Corporation 2002, 2010
7  */
8
9 /*
10  * Driver authors:
11  *            Martin Peschke (originator of the driver)
12  *            Raimund Schroeder
13  *            Aron Zeh
14  *            Wolfgang Taphorn
15  *            Stefan Bader
16  *            Heiko Carstens (kernel 2.6 port of the driver)
17  *            Andreas Herrmann
18  *            Maxim Shchetynin
19  *            Volker Sameske
20  *            Ralph Wuerthner
21  *            Michael Loehr
22  *            Swen Schillig
23  *            Christof Schmitt
24  *            Martin Petermann
25  *            Sven Schuetz
26  */
27
28 #define KMSG_COMPONENT "zfcp"
29 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
30
31 #include <linux/miscdevice.h>
32 #include <linux/seq_file.h>
33 #include <linux/slab.h>
34 #include "zfcp_ext.h"
35 #include "zfcp_fc.h"
36 #include "zfcp_reqlist.h"
37
38 #define ZFCP_BUS_ID_SIZE        20
39
40 MODULE_AUTHOR("IBM Deutschland Entwicklung GmbH - linux390@de.ibm.com");
41 MODULE_DESCRIPTION("FCP HBA driver");
42 MODULE_LICENSE("GPL");
43
44 static char *init_device;
45 module_param_named(device, init_device, charp, 0400);
46 MODULE_PARM_DESC(device, "specify initial device");
47
48 static struct kmem_cache *zfcp_cache_hw_align(const char *name,
49                                               unsigned long size)
50 {
51         return kmem_cache_create(name, size, roundup_pow_of_two(size), 0, NULL);
52 }
53
54 static void __init zfcp_init_device_configure(char *busid, u64 wwpn, u64 lun)
55 {
56         struct ccw_device *cdev;
57         struct zfcp_adapter *adapter;
58         struct zfcp_port *port;
59         struct zfcp_unit *unit;
60
61         cdev = get_ccwdev_by_busid(&zfcp_ccw_driver, busid);
62         if (!cdev)
63                 return;
64
65         if (ccw_device_set_online(cdev))
66                 goto out_ccw_device;
67
68         adapter = zfcp_ccw_adapter_by_cdev(cdev);
69         if (!adapter)
70                 goto out_ccw_device;
71
72         port = zfcp_get_port_by_wwpn(adapter, wwpn);
73         if (!port)
74                 goto out_port;
75
76         unit = zfcp_unit_enqueue(port, lun);
77         if (IS_ERR(unit))
78                 goto out_unit;
79
80         zfcp_erp_unit_reopen(unit, 0, "auidc_1", NULL);
81         zfcp_erp_wait(adapter);
82         flush_work(&unit->scsi_work);
83
84 out_unit:
85         put_device(&port->dev);
86 out_port:
87         zfcp_ccw_adapter_put(adapter);
88 out_ccw_device:
89         put_device(&cdev->dev);
90         return;
91 }
92
93 static void __init zfcp_init_device_setup(char *devstr)
94 {
95         char *token;
96         char *str, *str_saved;
97         char busid[ZFCP_BUS_ID_SIZE];
98         u64 wwpn, lun;
99
100         /* duplicate devstr and keep the original for sysfs presentation*/
101         str_saved = kstrdup(devstr, GFP_KERNEL);
102         str = str_saved;
103         if (!str)
104                 return;
105
106         token = strsep(&str, ",");
107         if (!token || strlen(token) >= ZFCP_BUS_ID_SIZE)
108                 goto err_out;
109         strncpy(busid, token, ZFCP_BUS_ID_SIZE);
110
111         token = strsep(&str, ",");
112         if (!token || strict_strtoull(token, 0, (unsigned long long *) &wwpn))
113                 goto err_out;
114
115         token = strsep(&str, ",");
116         if (!token || strict_strtoull(token, 0, (unsigned long long *) &lun))
117                 goto err_out;
118
119         kfree(str_saved);
120         zfcp_init_device_configure(busid, wwpn, lun);
121         return;
122
123 err_out:
124         kfree(str_saved);
125         pr_err("%s is not a valid SCSI device\n", devstr);
126 }
127
128 static int __init zfcp_module_init(void)
129 {
130         int retval = -ENOMEM;
131
132         zfcp_data.gpn_ft_cache = zfcp_cache_hw_align("zfcp_gpn",
133                                         sizeof(struct zfcp_fc_gpn_ft_req));
134         if (!zfcp_data.gpn_ft_cache)
135                 goto out;
136
137         zfcp_data.qtcb_cache = zfcp_cache_hw_align("zfcp_qtcb",
138                                         sizeof(struct fsf_qtcb));
139         if (!zfcp_data.qtcb_cache)
140                 goto out_qtcb_cache;
141
142         zfcp_data.sr_buffer_cache = zfcp_cache_hw_align("zfcp_sr",
143                                         sizeof(struct fsf_status_read_buffer));
144         if (!zfcp_data.sr_buffer_cache)
145                 goto out_sr_cache;
146
147         zfcp_data.gid_pn_cache = zfcp_cache_hw_align("zfcp_gid",
148                                         sizeof(struct zfcp_fc_gid_pn));
149         if (!zfcp_data.gid_pn_cache)
150                 goto out_gid_cache;
151
152         zfcp_data.adisc_cache = zfcp_cache_hw_align("zfcp_adisc",
153                                         sizeof(struct zfcp_fc_els_adisc));
154         if (!zfcp_data.adisc_cache)
155                 goto out_adisc_cache;
156
157         zfcp_data.scsi_transport_template =
158                 fc_attach_transport(&zfcp_transport_functions);
159         if (!zfcp_data.scsi_transport_template)
160                 goto out_transport;
161
162         retval = misc_register(&zfcp_cfdc_misc);
163         if (retval) {
164                 pr_err("Registering the misc device zfcp_cfdc failed\n");
165                 goto out_misc;
166         }
167
168         retval = ccw_driver_register(&zfcp_ccw_driver);
169         if (retval) {
170                 pr_err("The zfcp device driver could not register with "
171                        "the common I/O layer\n");
172                 goto out_ccw_register;
173         }
174
175         if (init_device)
176                 zfcp_init_device_setup(init_device);
177         return 0;
178
179 out_ccw_register:
180         misc_deregister(&zfcp_cfdc_misc);
181 out_misc:
182         fc_release_transport(zfcp_data.scsi_transport_template);
183 out_transport:
184         kmem_cache_destroy(zfcp_data.adisc_cache);
185 out_adisc_cache:
186         kmem_cache_destroy(zfcp_data.gid_pn_cache);
187 out_gid_cache:
188         kmem_cache_destroy(zfcp_data.sr_buffer_cache);
189 out_sr_cache:
190         kmem_cache_destroy(zfcp_data.qtcb_cache);
191 out_qtcb_cache:
192         kmem_cache_destroy(zfcp_data.gpn_ft_cache);
193 out:
194         return retval;
195 }
196
197 module_init(zfcp_module_init);
198
199 static void __exit zfcp_module_exit(void)
200 {
201         ccw_driver_unregister(&zfcp_ccw_driver);
202         misc_deregister(&zfcp_cfdc_misc);
203         fc_release_transport(zfcp_data.scsi_transport_template);
204         kmem_cache_destroy(zfcp_data.adisc_cache);
205         kmem_cache_destroy(zfcp_data.gid_pn_cache);
206         kmem_cache_destroy(zfcp_data.sr_buffer_cache);
207         kmem_cache_destroy(zfcp_data.qtcb_cache);
208         kmem_cache_destroy(zfcp_data.gpn_ft_cache);
209 }
210
211 module_exit(zfcp_module_exit);
212
213 /**
214  * zfcp_get_unit_by_lun - find unit in unit list of port by FCP LUN
215  * @port: pointer to port to search for unit
216  * @fcp_lun: FCP LUN to search for
217  *
218  * Returns: pointer to zfcp_unit or NULL
219  */
220 struct zfcp_unit *zfcp_get_unit_by_lun(struct zfcp_port *port, u64 fcp_lun)
221 {
222         unsigned long flags;
223         struct zfcp_unit *unit;
224
225         read_lock_irqsave(&port->unit_list_lock, flags);
226         list_for_each_entry(unit, &port->unit_list, list)
227                 if (unit->fcp_lun == fcp_lun) {
228                         if (!get_device(&unit->dev))
229                                 unit = NULL;
230                         read_unlock_irqrestore(&port->unit_list_lock, flags);
231                         return unit;
232                 }
233         read_unlock_irqrestore(&port->unit_list_lock, flags);
234         return NULL;
235 }
236
237 /**
238  * zfcp_get_port_by_wwpn - find port in port list of adapter by wwpn
239  * @adapter: pointer to adapter to search for port
240  * @wwpn: wwpn to search for
241  *
242  * Returns: pointer to zfcp_port or NULL
243  */
244 struct zfcp_port *zfcp_get_port_by_wwpn(struct zfcp_adapter *adapter,
245                                         u64 wwpn)
246 {
247         unsigned long flags;
248         struct zfcp_port *port;
249
250         read_lock_irqsave(&adapter->port_list_lock, flags);
251         list_for_each_entry(port, &adapter->port_list, list)
252                 if (port->wwpn == wwpn) {
253                         if (!get_device(&port->dev))
254                                 port = NULL;
255                         read_unlock_irqrestore(&adapter->port_list_lock, flags);
256                         return port;
257                 }
258         read_unlock_irqrestore(&adapter->port_list_lock, flags);
259         return NULL;
260 }
261
262 /**
263  * zfcp_unit_release - dequeue unit
264  * @dev: pointer to device
265  *
266  * waits until all work is done on unit and removes it then from the unit->list
267  * of the associated port.
268  */
269 static void zfcp_unit_release(struct device *dev)
270 {
271         struct zfcp_unit *unit = container_of(dev, struct zfcp_unit, dev);
272
273         put_device(&unit->port->dev);
274         kfree(unit);
275 }
276
277 /**
278  * zfcp_unit_enqueue - enqueue unit to unit list of a port.
279  * @port: pointer to port where unit is added
280  * @fcp_lun: FCP LUN of unit to be enqueued
281  * Returns: pointer to enqueued unit on success, ERR_PTR on error
282  *
283  * Sets up some unit internal structures and creates sysfs entry.
284  */
285 struct zfcp_unit *zfcp_unit_enqueue(struct zfcp_port *port, u64 fcp_lun)
286 {
287         struct zfcp_unit *unit;
288         int retval = -ENOMEM;
289
290         get_device(&port->dev);
291
292         unit = zfcp_get_unit_by_lun(port, fcp_lun);
293         if (unit) {
294                 put_device(&unit->dev);
295                 retval = -EEXIST;
296                 goto err_out;
297         }
298
299         unit = kzalloc(sizeof(struct zfcp_unit), GFP_KERNEL);
300         if (!unit)
301                 goto err_out;
302
303         unit->port = port;
304         unit->fcp_lun = fcp_lun;
305         unit->dev.parent = &port->dev;
306         unit->dev.release = zfcp_unit_release;
307
308         if (dev_set_name(&unit->dev, "0x%016llx",
309                          (unsigned long long) fcp_lun)) {
310                 kfree(unit);
311                 goto err_out;
312         }
313         retval = -EINVAL;
314
315         INIT_WORK(&unit->scsi_work, zfcp_scsi_scan_work);
316
317         spin_lock_init(&unit->latencies.lock);
318         unit->latencies.write.channel.min = 0xFFFFFFFF;
319         unit->latencies.write.fabric.min = 0xFFFFFFFF;
320         unit->latencies.read.channel.min = 0xFFFFFFFF;
321         unit->latencies.read.fabric.min = 0xFFFFFFFF;
322         unit->latencies.cmd.channel.min = 0xFFFFFFFF;
323         unit->latencies.cmd.fabric.min = 0xFFFFFFFF;
324
325         if (device_register(&unit->dev)) {
326                 put_device(&unit->dev);
327                 goto err_out;
328         }
329
330         if (sysfs_create_group(&unit->dev.kobj, &zfcp_sysfs_unit_attrs))
331                 goto err_out_put;
332
333         write_lock_irq(&port->unit_list_lock);
334         list_add_tail(&unit->list, &port->unit_list);
335         write_unlock_irq(&port->unit_list_lock);
336
337         atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status);
338
339         return unit;
340
341 err_out_put:
342         device_unregister(&unit->dev);
343 err_out:
344         put_device(&port->dev);
345         return ERR_PTR(retval);
346 }
347
348 static int zfcp_allocate_low_mem_buffers(struct zfcp_adapter *adapter)
349 {
350         adapter->pool.erp_req =
351                 mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req));
352         if (!adapter->pool.erp_req)
353                 return -ENOMEM;
354
355         adapter->pool.gid_pn_req =
356                 mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req));
357         if (!adapter->pool.gid_pn_req)
358                 return -ENOMEM;
359
360         adapter->pool.scsi_req =
361                 mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req));
362         if (!adapter->pool.scsi_req)
363                 return -ENOMEM;
364
365         adapter->pool.scsi_abort =
366                 mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req));
367         if (!adapter->pool.scsi_abort)
368                 return -ENOMEM;
369
370         adapter->pool.status_read_req =
371                 mempool_create_kmalloc_pool(FSF_STATUS_READS_RECOM,
372                                             sizeof(struct zfcp_fsf_req));
373         if (!adapter->pool.status_read_req)
374                 return -ENOMEM;
375
376         adapter->pool.qtcb_pool =
377                 mempool_create_slab_pool(4, zfcp_data.qtcb_cache);
378         if (!adapter->pool.qtcb_pool)
379                 return -ENOMEM;
380
381         adapter->pool.status_read_data =
382                 mempool_create_slab_pool(FSF_STATUS_READS_RECOM,
383                                          zfcp_data.sr_buffer_cache);
384         if (!adapter->pool.status_read_data)
385                 return -ENOMEM;
386
387         adapter->pool.gid_pn =
388                 mempool_create_slab_pool(1, zfcp_data.gid_pn_cache);
389         if (!adapter->pool.gid_pn)
390                 return -ENOMEM;
391
392         return 0;
393 }
394
395 static void zfcp_free_low_mem_buffers(struct zfcp_adapter *adapter)
396 {
397         if (adapter->pool.erp_req)
398                 mempool_destroy(adapter->pool.erp_req);
399         if (adapter->pool.scsi_req)
400                 mempool_destroy(adapter->pool.scsi_req);
401         if (adapter->pool.scsi_abort)
402                 mempool_destroy(adapter->pool.scsi_abort);
403         if (adapter->pool.qtcb_pool)
404                 mempool_destroy(adapter->pool.qtcb_pool);
405         if (adapter->pool.status_read_req)
406                 mempool_destroy(adapter->pool.status_read_req);
407         if (adapter->pool.status_read_data)
408                 mempool_destroy(adapter->pool.status_read_data);
409         if (adapter->pool.gid_pn)
410                 mempool_destroy(adapter->pool.gid_pn);
411 }
412
413 /**
414  * zfcp_status_read_refill - refill the long running status_read_requests
415  * @adapter: ptr to struct zfcp_adapter for which the buffers should be refilled
416  *
417  * Returns: 0 on success, 1 otherwise
418  *
419  * if there are 16 or more status_read requests missing an adapter_reopen
420  * is triggered
421  */
422 int zfcp_status_read_refill(struct zfcp_adapter *adapter)
423 {
424         while (atomic_read(&adapter->stat_miss) > 0)
425                 if (zfcp_fsf_status_read(adapter->qdio)) {
426                         if (atomic_read(&adapter->stat_miss) >=
427                             adapter->stat_read_buf_num) {
428                                 zfcp_erp_adapter_reopen(adapter, 0, "axsref1",
429                                                         NULL);
430                                 return 1;
431                         }
432                         break;
433                 } else
434                         atomic_dec(&adapter->stat_miss);
435         return 0;
436 }
437
438 static void _zfcp_status_read_scheduler(struct work_struct *work)
439 {
440         zfcp_status_read_refill(container_of(work, struct zfcp_adapter,
441                                              stat_work));
442 }
443
444 static void zfcp_print_sl(struct seq_file *m, struct service_level *sl)
445 {
446         struct zfcp_adapter *adapter =
447                 container_of(sl, struct zfcp_adapter, service_level);
448
449         seq_printf(m, "zfcp: %s microcode level %x\n",
450                    dev_name(&adapter->ccw_device->dev),
451                    adapter->fsf_lic_version);
452 }
453
454 static int zfcp_setup_adapter_work_queue(struct zfcp_adapter *adapter)
455 {
456         char name[TASK_COMM_LEN];
457
458         snprintf(name, sizeof(name), "zfcp_q_%s",
459                  dev_name(&adapter->ccw_device->dev));
460         adapter->work_queue = create_singlethread_workqueue(name);
461
462         if (adapter->work_queue)
463                 return 0;
464         return -ENOMEM;
465 }
466
467 static void zfcp_destroy_adapter_work_queue(struct zfcp_adapter *adapter)
468 {
469         if (adapter->work_queue)
470                 destroy_workqueue(adapter->work_queue);
471         adapter->work_queue = NULL;
472
473 }
474
475 /**
476  * zfcp_adapter_enqueue - enqueue a new adapter to the list
477  * @ccw_device: pointer to the struct cc_device
478  *
479  * Returns:     struct zfcp_adapter*
480  * Enqueues an adapter at the end of the adapter list in the driver data.
481  * All adapter internal structures are set up.
482  * Proc-fs entries are also created.
483  */
484 struct zfcp_adapter *zfcp_adapter_enqueue(struct ccw_device *ccw_device)
485 {
486         struct zfcp_adapter *adapter;
487
488         if (!get_device(&ccw_device->dev))
489                 return ERR_PTR(-ENODEV);
490
491         adapter = kzalloc(sizeof(struct zfcp_adapter), GFP_KERNEL);
492         if (!adapter) {
493                 put_device(&ccw_device->dev);
494                 return ERR_PTR(-ENOMEM);
495         }
496
497         kref_init(&adapter->ref);
498
499         ccw_device->handler = NULL;
500         adapter->ccw_device = ccw_device;
501
502         INIT_WORK(&adapter->stat_work, _zfcp_status_read_scheduler);
503         INIT_WORK(&adapter->scan_work, zfcp_fc_scan_ports);
504
505         if (zfcp_qdio_setup(adapter))
506                 goto failed;
507
508         if (zfcp_allocate_low_mem_buffers(adapter))
509                 goto failed;
510
511         adapter->req_list = zfcp_reqlist_alloc();
512         if (!adapter->req_list)
513                 goto failed;
514
515         if (zfcp_dbf_adapter_register(adapter))
516                 goto failed;
517
518         if (zfcp_setup_adapter_work_queue(adapter))
519                 goto failed;
520
521         if (zfcp_fc_gs_setup(adapter))
522                 goto failed;
523
524         rwlock_init(&adapter->port_list_lock);
525         INIT_LIST_HEAD(&adapter->port_list);
526
527         INIT_LIST_HEAD(&adapter->events.list);
528         INIT_WORK(&adapter->events.work, zfcp_fc_post_event);
529         spin_lock_init(&adapter->events.list_lock);
530
531         init_waitqueue_head(&adapter->erp_ready_wq);
532         init_waitqueue_head(&adapter->erp_done_wqh);
533
534         INIT_LIST_HEAD(&adapter->erp_ready_head);
535         INIT_LIST_HEAD(&adapter->erp_running_head);
536
537         rwlock_init(&adapter->erp_lock);
538         rwlock_init(&adapter->abort_lock);
539
540         if (zfcp_erp_thread_setup(adapter))
541                 goto failed;
542
543         adapter->service_level.seq_print = zfcp_print_sl;
544
545         dev_set_drvdata(&ccw_device->dev, adapter);
546
547         if (sysfs_create_group(&ccw_device->dev.kobj,
548                                &zfcp_sysfs_adapter_attrs))
549                 goto failed;
550
551         /* report size limit per scatter-gather segment */
552         adapter->dma_parms.max_segment_size = ZFCP_QDIO_SBALE_LEN;
553         adapter->ccw_device->dev.dma_parms = &adapter->dma_parms;
554
555         if (!zfcp_adapter_scsi_register(adapter))
556                 return adapter;
557
558 failed:
559         zfcp_adapter_unregister(adapter);
560         return ERR_PTR(-ENOMEM);
561 }
562
563 void zfcp_adapter_unregister(struct zfcp_adapter *adapter)
564 {
565         struct ccw_device *cdev = adapter->ccw_device;
566
567         cancel_work_sync(&adapter->scan_work);
568         cancel_work_sync(&adapter->stat_work);
569         zfcp_destroy_adapter_work_queue(adapter);
570
571         zfcp_fc_wka_ports_force_offline(adapter->gs);
572         zfcp_adapter_scsi_unregister(adapter);
573         sysfs_remove_group(&cdev->dev.kobj, &zfcp_sysfs_adapter_attrs);
574
575         zfcp_erp_thread_kill(adapter);
576         zfcp_dbf_adapter_unregister(adapter->dbf);
577         zfcp_qdio_destroy(adapter->qdio);
578
579         zfcp_ccw_adapter_put(adapter); /* final put to release */
580 }
581
582 /**
583  * zfcp_adapter_release - remove the adapter from the resource list
584  * @ref: pointer to struct kref
585  * locks:       adapter list write lock is assumed to be held by caller
586  */
587 void zfcp_adapter_release(struct kref *ref)
588 {
589         struct zfcp_adapter *adapter = container_of(ref, struct zfcp_adapter,
590                                                     ref);
591         struct ccw_device *cdev = adapter->ccw_device;
592
593         dev_set_drvdata(&adapter->ccw_device->dev, NULL);
594         zfcp_fc_gs_destroy(adapter);
595         zfcp_free_low_mem_buffers(adapter);
596         kfree(adapter->req_list);
597         kfree(adapter->fc_stats);
598         kfree(adapter->stats_reset_data);
599         kfree(adapter);
600         put_device(&cdev->dev);
601 }
602
603 /**
604  * zfcp_device_unregister - remove port, unit from system
605  * @dev: reference to device which is to be removed
606  * @grp: related reference to attribute group
607  *
608  * Helper function to unregister port, unit from system
609  */
610 void zfcp_device_unregister(struct device *dev,
611                             const struct attribute_group *grp)
612 {
613         sysfs_remove_group(&dev->kobj, grp);
614         device_unregister(dev);
615 }
616
617 static void zfcp_port_release(struct device *dev)
618 {
619         struct zfcp_port *port = container_of(dev, struct zfcp_port, dev);
620
621         zfcp_ccw_adapter_put(port->adapter);
622         kfree(port);
623 }
624
625 /**
626  * zfcp_port_enqueue - enqueue port to port list of adapter
627  * @adapter: adapter where remote port is added
628  * @wwpn: WWPN of the remote port to be enqueued
629  * @status: initial status for the port
630  * @d_id: destination id of the remote port to be enqueued
631  * Returns: pointer to enqueued port on success, ERR_PTR on error
632  *
633  * All port internal structures are set up and the sysfs entry is generated.
634  * d_id is used to enqueue ports with a well known address like the Directory
635  * Service for nameserver lookup.
636  */
637 struct zfcp_port *zfcp_port_enqueue(struct zfcp_adapter *adapter, u64 wwpn,
638                                      u32 status, u32 d_id)
639 {
640         struct zfcp_port *port;
641         int retval = -ENOMEM;
642
643         kref_get(&adapter->ref);
644
645         port = zfcp_get_port_by_wwpn(adapter, wwpn);
646         if (port) {
647                 put_device(&port->dev);
648                 retval = -EEXIST;
649                 goto err_out;
650         }
651
652         port = kzalloc(sizeof(struct zfcp_port), GFP_KERNEL);
653         if (!port)
654                 goto err_out;
655
656         rwlock_init(&port->unit_list_lock);
657         INIT_LIST_HEAD(&port->unit_list);
658
659         INIT_WORK(&port->gid_pn_work, zfcp_fc_port_did_lookup);
660         INIT_WORK(&port->test_link_work, zfcp_fc_link_test_work);
661         INIT_WORK(&port->rport_work, zfcp_scsi_rport_work);
662
663         port->adapter = adapter;
664         port->d_id = d_id;
665         port->wwpn = wwpn;
666         port->rport_task = RPORT_NONE;
667         port->dev.parent = &adapter->ccw_device->dev;
668         port->dev.release = zfcp_port_release;
669
670         if (dev_set_name(&port->dev, "0x%016llx", (unsigned long long)wwpn)) {
671                 kfree(port);
672                 goto err_out;
673         }
674         retval = -EINVAL;
675
676         if (device_register(&port->dev)) {
677                 put_device(&port->dev);
678                 goto err_out;
679         }
680
681         if (sysfs_create_group(&port->dev.kobj,
682                                &zfcp_sysfs_port_attrs))
683                 goto err_out_put;
684
685         write_lock_irq(&adapter->port_list_lock);
686         list_add_tail(&port->list, &adapter->port_list);
687         write_unlock_irq(&adapter->port_list_lock);
688
689         atomic_set_mask(status | ZFCP_STATUS_COMMON_RUNNING, &port->status);
690
691         return port;
692
693 err_out_put:
694         device_unregister(&port->dev);
695 err_out:
696         zfcp_ccw_adapter_put(adapter);
697         return ERR_PTR(retval);
698 }
699
700 /**
701  * zfcp_sg_free_table - free memory used by scatterlists
702  * @sg: pointer to scatterlist
703  * @count: number of scatterlist which are to be free'ed
704  * the scatterlist are expected to reference pages always
705  */
706 void zfcp_sg_free_table(struct scatterlist *sg, int count)
707 {
708         int i;
709
710         for (i = 0; i < count; i++, sg++)
711                 if (sg)
712                         free_page((unsigned long) sg_virt(sg));
713                 else
714                         break;
715 }
716
717 /**
718  * zfcp_sg_setup_table - init scatterlist and allocate, assign buffers
719  * @sg: pointer to struct scatterlist
720  * @count: number of scatterlists which should be assigned with buffers
721  * of size page
722  *
723  * Returns: 0 on success, -ENOMEM otherwise
724  */
725 int zfcp_sg_setup_table(struct scatterlist *sg, int count)
726 {
727         void *addr;
728         int i;
729
730         sg_init_table(sg, count);
731         for (i = 0; i < count; i++, sg++) {
732                 addr = (void *) get_zeroed_page(GFP_KERNEL);
733                 if (!addr) {
734                         zfcp_sg_free_table(sg, i);
735                         return -ENOMEM;
736                 }
737                 sg_set_buf(sg, addr, PAGE_SIZE);
738         }
739         return 0;
740 }