1 // SPDX-License-Identifier: GPL-2.0
23  * 		If target is SCSI-3 or up, issue a REPORT LUN, and scan
36 #include <linux/async.h>
63  * Prefix values for the SCSI id's (stored in sysfs name field)
92 		 "last scsi LUN (should be between 1 and 2^64-1)");
95 #define SCSI_SCAN_TYPE_DEFAULT "async"
104 MODULE_PARM_DESC(scan, "sync, async, manual, or none. "
126  * scsi_enable_async_suspend - Enable async suspend and resume
131 	 * If a user has disabled async probing a likely reason is due to a  in scsi_enable_async_suspend()
132 	 * storage enclosure that does not inject staggered spin-ups. For  in scsi_enable_async_suspend()
135 	if (strncmp(scsi_scan_type, "async", 5) != 0)  in scsi_enable_async_suspend()
142  * scsi_complete_async_scans - Wait for asynchronous scans to complete
157 		 * sleep a little.  Even if we never get memory, the async  in scsi_complete_async_scans()
165 	data->shost = NULL;  in scsi_complete_async_scans()
166 	init_completion(&data->prev_finished);  in scsi_complete_async_scans()
172 	list_add_tail(&data->list, &scanning_hosts);  in scsi_complete_async_scans()
176 	wait_for_completion(&data->prev_finished);  in scsi_complete_async_scans()
179 	list_del(&data->list);  in scsi_complete_async_scans()
183 		complete(&next->prev_finished);  in scsi_complete_async_scans()
193  * scsi_unlock_floptical - unlock device via a special MODE SENSE command
221 	bool need_alloc = !sdev->budget_map.map;  in scsi_realloc_sdev_budget_map()
230 	 * up one new default queue depth after calling ->slave_configure  in scsi_realloc_sdev_budget_map()
232 	if (!need_alloc && new_shift != sdev->budget_map.shift)  in scsi_realloc_sdev_budget_map()
243 		blk_mq_freeze_queue(sdev->request_queue);  in scsi_realloc_sdev_budget_map()
244 		sb_backup = sdev->budget_map;  in scsi_realloc_sdev_budget_map()
246 	ret = sbitmap_init_node(&sdev->budget_map,  in scsi_realloc_sdev_budget_map()
249 				sdev->request_queue->node, false, true);  in scsi_realloc_sdev_budget_map()
251 		sbitmap_resize(&sdev->budget_map, depth);  in scsi_realloc_sdev_budget_map()
255 			sdev->budget_map = sb_backup;  in scsi_realloc_sdev_budget_map()
259 		blk_mq_unfreeze_queue(sdev->request_queue);  in scsi_realloc_sdev_budget_map()
265  * scsi_alloc_sdev - allocate and setup a scsi_Device
268  * @hostdata: usually NULL and set by ->slave_alloc instead
285 	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);  in scsi_alloc_sdev()
287 	sdev = kzalloc(sizeof(*sdev) + shost->transportt->device_size,  in scsi_alloc_sdev()
292 	sdev->vendor = scsi_null_device_strs;  in scsi_alloc_sdev()
293 	sdev->model = scsi_null_device_strs;  in scsi_alloc_sdev()
294 	sdev->rev = scsi_null_device_strs;  in scsi_alloc_sdev()
295 	sdev->host = shost;  in scsi_alloc_sdev()
296 	sdev->queue_ramp_up_period = SCSI_DEFAULT_RAMP_UP_PERIOD;  in scsi_alloc_sdev()
297 	sdev->id = starget->id;  in scsi_alloc_sdev()
298 	sdev->lun = lun;  in scsi_alloc_sdev()
299 	sdev->channel = starget->channel;  in scsi_alloc_sdev()
300 	mutex_init(&sdev->state_mutex);  in scsi_alloc_sdev()
301 	sdev->sdev_state = SDEV_CREATED;  in scsi_alloc_sdev()
302 	INIT_LIST_HEAD(&sdev->siblings);  in scsi_alloc_sdev()
303 	INIT_LIST_HEAD(&sdev->same_target_siblings);  in scsi_alloc_sdev()
304 	INIT_LIST_HEAD(&sdev->starved_entry);  in scsi_alloc_sdev()
305 	INIT_LIST_HEAD(&sdev->event_list);  in scsi_alloc_sdev()
306 	spin_lock_init(&sdev->list_lock);  in scsi_alloc_sdev()
307 	mutex_init(&sdev->inquiry_mutex);  in scsi_alloc_sdev()
308 	INIT_WORK(&sdev->event_work, scsi_evt_thread);  in scsi_alloc_sdev()
309 	INIT_WORK(&sdev->requeue_work, scsi_requeue_run_queue);  in scsi_alloc_sdev()
311 	sdev->sdev_gendev.parent = get_device(&starget->dev);  in scsi_alloc_sdev()
312 	sdev->sdev_target = starget;  in scsi_alloc_sdev()
314 	/* usually NULL and set by ->slave_alloc instead */  in scsi_alloc_sdev()
315 	sdev->hostdata = hostdata;  in scsi_alloc_sdev()
319 	sdev->max_device_blocked = SCSI_DEFAULT_DEVICE_BLOCKED;  in scsi_alloc_sdev()
322 	 * Some low level driver could use device->type  in scsi_alloc_sdev()
324 	sdev->type = -1;  in scsi_alloc_sdev()
331 	sdev->borken = 1;  in scsi_alloc_sdev()
333 	sdev->sg_reserved_size = INT_MAX;  in scsi_alloc_sdev()
335 	q = blk_mq_init_queue(&sdev->host->tag_set);  in scsi_alloc_sdev()
339 		put_device(&starget->dev);  in scsi_alloc_sdev()
343 	kref_get(&sdev->host->tagset_refcnt);  in scsi_alloc_sdev()
344 	sdev->request_queue = q;  in scsi_alloc_sdev()
345 	q->queuedata = sdev;  in scsi_alloc_sdev()
346 	__scsi_init_queue(sdev->host, q);  in scsi_alloc_sdev()
348 	depth = sdev->host->cmd_per_lun ?: 1;  in scsi_alloc_sdev()
357 		put_device(&starget->dev);  in scsi_alloc_sdev()
366 	if (shost->hostt->slave_alloc) {  in scsi_alloc_sdev()
367 		ret = shost->hostt->slave_alloc(sdev);  in scsi_alloc_sdev()
373 			if (ret == -ENXIO)  in scsi_alloc_sdev()
391 	struct device *dev = &starget->dev;  in scsi_target_destroy()
392 	struct Scsi_Host *shost = dev_to_shost(dev->parent);  in scsi_target_destroy()
395 	BUG_ON(starget->state == STARGET_DEL);  in scsi_target_destroy()
396 	starget->state = STARGET_DEL;  in scsi_target_destroy()
398 	spin_lock_irqsave(shost->host_lock, flags);  in scsi_target_destroy()
399 	if (shost->hostt->target_destroy)  in scsi_target_destroy()
400 		shost->hostt->target_destroy(starget);  in scsi_target_destroy()
401 	list_del_init(&starget->siblings);  in scsi_target_destroy()
402 	spin_unlock_irqrestore(shost->host_lock, flags);  in scsi_target_destroy()
408 	struct device *parent = dev->parent;  in scsi_target_dev_release()
422 	return dev->type == &scsi_target_type;  in scsi_is_target_device()
434 	list_for_each_entry(starget, &shost->__targets, siblings) {  in __scsi_find_target()
435 		if (starget->id == id &&  in __scsi_find_target()
436 		    starget->channel == channel) {  in __scsi_find_target()
442 		get_device(&found_starget->dev);  in __scsi_find_target()
448  * scsi_target_reap_ref_release - remove target from visibility
466 	if ((starget->state != STARGET_CREATED) &&  in scsi_target_reap_ref_release()
467 	    (starget->state != STARGET_CREATED_REMOVE)) {  in scsi_target_reap_ref_release()
468 		transport_remove_device(&starget->dev);  in scsi_target_reap_ref_release()
469 		device_del(&starget->dev);  in scsi_target_reap_ref_release()
476 	kref_put(&starget->reap_ref, scsi_target_reap_ref_release);  in scsi_target_reap_ref_put()
480  * scsi_alloc_target - allocate a new or find an existing target
498 		+ shost->transportt->target_size;  in scsi_alloc_target()
508 	dev = &starget->dev;  in scsi_alloc_target()
510 	kref_init(&starget->reap_ref);  in scsi_alloc_target()
511 	dev->parent = get_device(parent);  in scsi_alloc_target()
512 	dev_set_name(dev, "target%d:%d:%d", shost->host_no, channel, id);  in scsi_alloc_target()
513 	dev->bus = &scsi_bus_type;  in scsi_alloc_target()
514 	dev->type = &scsi_target_type;  in scsi_alloc_target()
516 	starget->id = id;  in scsi_alloc_target()
517 	starget->channel = channel;  in scsi_alloc_target()
518 	starget->can_queue = 0;  in scsi_alloc_target()
519 	INIT_LIST_HEAD(&starget->siblings);  in scsi_alloc_target()
520 	INIT_LIST_HEAD(&starget->devices);  in scsi_alloc_target()
521 	starget->state = STARGET_CREATED;  in scsi_alloc_target()
522 	starget->scsi_level = SCSI_2;  in scsi_alloc_target()
523 	starget->max_target_blocked = SCSI_DEFAULT_TARGET_BLOCKED;  in scsi_alloc_target()
525 	spin_lock_irqsave(shost->host_lock, flags);  in scsi_alloc_target()
531 	list_add_tail(&starget->siblings, &shost->__targets);  in scsi_alloc_target()
532 	spin_unlock_irqrestore(shost->host_lock, flags);  in scsi_alloc_target()
535 	if (shost->hostt->target_alloc) {  in scsi_alloc_target()
536 		error = shost->hostt->target_alloc(starget);  in scsi_alloc_target()
539 			if (error != -ENXIO)  in scsi_alloc_target()
557 	ref_got = kref_get_unless_zero(&found_target->reap_ref);  in scsi_alloc_target()
559 	spin_unlock_irqrestore(shost->host_lock, flags);  in scsi_alloc_target()
573 	put_device(&found_target->dev);  in scsi_alloc_target()
583  * scsi_target_reap - check to see if target is in use and destroy if not
597 	BUG_ON(starget->state == STARGET_DEL);  in scsi_target_reap()
602  * scsi_sanitize_inquiry_string - remove non-graphical chars from an
611  *	this rule, we will replace non-graphic or non-ASCII characters
620 	for (; len > 0; (--len, ++s)) {  in scsi_sanitize_inquiry_string()
630  * scsi_probe_lun - probe a single LUN using a SCSI INQUIRY
659 	 * transfer length of 36 unless sdev->inquiry_len specifies a  in scsi_probe_lun()
661 	first_inquiry_len = sdev->inquiry_len ? sdev->inquiry_len : 36;  in scsi_probe_lun()
689 			 * not-ready to ready transition [asc/ascq=0x28/0x0]  in scsi_probe_lun()
690 			 * or power-on, reset [asc/ascq=0x29/0x0], continue.  in scsi_probe_lun()
739 			 * LLD specified a maximum sdev->inquiry_len  in scsi_probe_lun()
742 			 * devices. If a device supports SPC-4 (2014)  in scsi_probe_lun()
746 			else if (sdev->inquiry_len &&  in scsi_probe_lun()
747 				 response_len > sdev->inquiry_len &&  in scsi_probe_lun()
748 				 (inq_result[2] & 0x7) < 6) /* SPC-4 */  in scsi_probe_lun()
749 				next_inquiry_len = sdev->inquiry_len;  in scsi_probe_lun()
777 		return -EIO;  in scsi_probe_lun()
780 	sdev->inquiry_len = min(try_inquiry_len, response_len);  in scsi_probe_lun()
785 	 * and it would be possible to take an incorrect action - we do  in scsi_probe_lun()
793 	 * better than copying < 36 bytes to the inquiry-result buffer  in scsi_probe_lun()
797 	if (sdev->inquiry_len < 36) {  in scsi_probe_lun()
798 		if (!sdev->host->short_inquiry) {  in scsi_probe_lun()
799 			shost_printk(KERN_INFO, sdev->host,  in scsi_probe_lun()
801 				    " using 36\n", sdev->inquiry_len);  in scsi_probe_lun()
802 			sdev->host->short_inquiry = 1;  in scsi_probe_lun()
804 		sdev->inquiry_len = 36;  in scsi_probe_lun()
823 	 * non-zero LUNs can be scanned.  in scsi_probe_lun()
825 	sdev->scsi_level = inq_result[2] & 0x0f;  in scsi_probe_lun()
826 	if (sdev->scsi_level >= 2 ||  in scsi_probe_lun()
827 	    (sdev->scsi_level == 1 && (inq_result[3] & 0x0f) == 1))  in scsi_probe_lun()
828 		sdev->scsi_level++;  in scsi_probe_lun()
829 	sdev->sdev_target->scsi_level = sdev->scsi_level;  in scsi_probe_lun()
832 	 * If SCSI-2 or lower, and if the transport requires it,  in scsi_probe_lun()
835 	sdev->lun_in_cdb = 0;  in scsi_probe_lun()
836 	if (sdev->scsi_level <= SCSI_2 &&  in scsi_probe_lun()
837 	    sdev->scsi_level != SCSI_UNKNOWN &&  in scsi_probe_lun()
838 	    !sdev->host->no_scsi2_lun_in_cdb)  in scsi_probe_lun()
839 		sdev->lun_in_cdb = 1;  in scsi_probe_lun()
845  * scsi_add_lun - allocate and fully initialze a scsi_device
849  * @async:	1 if this device is being scanned asynchronously
860 		blist_flags_t *bflags, int async)  in scsi_add_lun()  argument
884 	sdev->inquiry = kmemdup(inq_result,  in scsi_add_lun()
885 				max_t(size_t, sdev->inquiry_len, 36),  in scsi_add_lun()
887 	if (sdev->inquiry == NULL)  in scsi_add_lun()
890 	sdev->vendor = (char *) (sdev->inquiry + 8);  in scsi_add_lun()
891 	sdev->model = (char *) (sdev->inquiry + 16);  in scsi_add_lun()
892 	sdev->rev = (char *) (sdev->inquiry + 32);  in scsi_add_lun()
894 	if (strncmp(sdev->vendor, "ATA     ", 8) == 0) {  in scsi_add_lun()
901 		sdev->allow_restart = 1;  in scsi_add_lun()
905 		sdev->type = TYPE_ROM;  in scsi_add_lun()
906 		sdev->removable = 1;  in scsi_add_lun()
908 		sdev->type = (inq_result[0] & 0x1f);  in scsi_add_lun()
909 		sdev->removable = (inq_result[1] & 0x80) >> 7;  in scsi_add_lun()
913 		 * well-known logical units. Force well-known type  in scsi_add_lun()
916 		if (scsi_is_wlun(sdev->lun) && sdev->type != TYPE_WLUN) {  in scsi_add_lun()
918 				"%s: correcting incorrect peripheral device type 0x%x for W-LUN 0x%16xhN\n",  in scsi_add_lun()
919 				__func__, sdev->type, (unsigned int)sdev->lun);  in scsi_add_lun()
920 			sdev->type = TYPE_WLUN;  in scsi_add_lun()
925 	if (sdev->type == TYPE_RBC || sdev->type == TYPE_ROM) {  in scsi_add_lun()
926 		/* RBC and MMC devices can return SCSI-3 compliance and yet  in scsi_add_lun()
950 	sdev->inq_periph_qual = (inq_result[0] >> 5) & 7;  in scsi_add_lun()
951 	sdev->lockable = sdev->removable;  in scsi_add_lun()
952 	sdev->soft_reset = (inq_result[7] & 1) && ((inq_result[3] & 7) == 2);  in scsi_add_lun()
954 	if (sdev->scsi_level >= SCSI_3 ||  in scsi_add_lun()
955 			(sdev->inquiry_len > 56 && inq_result[56] & 0x04))  in scsi_add_lun()
956 		sdev->ppr = 1;  in scsi_add_lun()
958 		sdev->wdtr = 1;  in scsi_add_lun()
960 		sdev->sdtr = 1;  in scsi_add_lun()
963 			"ANSI: %d%s\n", scsi_device_type(sdev->type),  in scsi_add_lun()
964 			sdev->vendor, sdev->model, sdev->rev,  in scsi_add_lun()
965 			sdev->inq_periph_qual, inq_result[2] & 0x07,  in scsi_add_lun()
968 	if ((sdev->scsi_level >= SCSI_2) && (inq_result[7] & 2) &&  in scsi_add_lun()
970 		sdev->tagged_supported = 1;  in scsi_add_lun()
971 		sdev->simple_tags = 1;  in scsi_add_lun()
980 		sdev->borken = 0;  in scsi_add_lun()
983 		sdev->no_uld_attach = 1;  in scsi_add_lun()
990 		sdev->select_no_atn = 1;  in scsi_add_lun()
997 		blk_queue_max_hw_sectors(sdev->request_queue, 512);  in scsi_add_lun()
1003 		blk_queue_max_hw_sectors(sdev->request_queue, 1024);  in scsi_add_lun()
1010 		sdev->no_start_on_add = 1;  in scsi_add_lun()
1013 		scsi_target(sdev)->single_lun = 1;  in scsi_add_lun()
1015 	sdev->use_10_for_rw = 1;  in scsi_add_lun()
1021 		sdev->no_report_opcodes = 1;  in scsi_add_lun()
1025 	mutex_lock(&sdev->state_mutex);  in scsi_add_lun()
1029 	mutex_unlock(&sdev->state_mutex);  in scsi_add_lun()
1034 			    scsi_device_state_name(sdev->sdev_state));  in scsi_add_lun()
1039 		sdev->lockable = 0;  in scsi_add_lun()
1042 		sdev->retry_hwerror = 1;  in scsi_add_lun()
1045 		sdev->no_dif = 1;  in scsi_add_lun()
1048 		sdev->unmap_limit_for_ws = 1;  in scsi_add_lun()
1051 		sdev->ignore_media_change = 1;  in scsi_add_lun()
1053 	sdev->eh_timeout = SCSI_DEFAULT_EH_TIMEOUT;  in scsi_add_lun()
1056 		sdev->try_vpd_pages = 1;  in scsi_add_lun()
1058 		sdev->skip_vpd_pages = 1;  in scsi_add_lun()
1061 		sdev->no_vpd_size = 1;  in scsi_add_lun()
1063 	transport_configure_device(&sdev->sdev_gendev);  in scsi_add_lun()
1065 	if (sdev->host->hostt->slave_configure) {  in scsi_add_lun()
1066 		ret = sdev->host->hostt->slave_configure(sdev);  in scsi_add_lun()
1072 			if (ret != -ENXIO) {  in scsi_add_lun()
1080 		 * The queue_depth is often changed in ->slave_configure.  in scsi_add_lun()
1084 		scsi_realloc_sdev_budget_map(sdev, sdev->queue_depth);  in scsi_add_lun()
1087 	if (sdev->scsi_level >= SCSI_3)  in scsi_add_lun()
1092 	sdev->max_queue_depth = sdev->queue_depth;  in scsi_add_lun()
1093 	WARN_ON_ONCE(sdev->max_queue_depth > sdev->budget_map.depth);  in scsi_add_lun()
1094 	sdev->sdev_bflags = *bflags;  in scsi_add_lun()
1101 	if (!async && scsi_sysfs_add_sdev(sdev) != 0)  in scsi_add_lun()
1109  * scsi_inq_str - print INQUIRY data from min to max index, strip trailing whitespace
1110  * @buf:   Output buffer with at least end-first+1 bytes of space
1134  * scsi_probe_and_add_lun - probe a LUN, if a LUN is found add it
1149  *   - SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device
1150  *   - SCSI_SCAN_TARGET_PRESENT: target responded, but no device is
1152  *   - SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized
1164 	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);  in scsi_probe_and_add_lun()
1175 				dev_name(&sdev->sdev_gendev)));  in scsi_probe_and_add_lun()
1183 								 sdev->vendor,  in scsi_probe_and_add_lun()
1184 								 sdev->model);  in scsi_probe_and_add_lun()
1213 		 * logical disk configured at sdev->lun, but there  in scsi_probe_and_add_lun()
1246 	 * 1) SCSI SPC-3, pp. 145-146  in scsi_probe_and_add_lun()
1253 	 * PDT=00h Direct-access device (floppy)  in scsi_probe_and_add_lun()
1256 	if (((result[0] >> 5) == 1 || starget->pdt_1f_for_no_lun) &&  in scsi_probe_and_add_lun()
1266 	res = scsi_add_lun(sdev, result, &bflags, shost->async_scan);  in scsi_probe_and_add_lun()
1269 			sdev->lockable = 0;  in scsi_probe_and_add_lun()
1293  * scsi_sequential_lun_scan - sequentially scan a SCSI target
1304  *     Modifies sdevscan->lun.
1312 	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);  in scsi_sequential_lun_scan()
1317 	max_dev_lun = min(max_scsi_luns, shost->max_lun);  in scsi_sequential_lun_scan()
1321 	 * SCSI-3 devices should be scanned via the REPORT LUNS.  in scsi_sequential_lun_scan()
1324 		max_dev_lun = shost->max_lun;  in scsi_sequential_lun_scan()
1337 	 * scan any SCSI_1 device for non-0 luns, but that check would best  in scsi_sequential_lun_scan()
1341 	if ((sdevscan->scsi_level < SCSI_1_CCS) &&  in scsi_sequential_lun_scan()
1351 		max_dev_lun = shost->max_lun;  in scsi_sequential_lun_scan()
1353 	 * REGAL CDC-4X: avoid hang after LUN 4  in scsi_sequential_lun_scan()
1358 	 * Do not scan SCSI-2 or lower device past LUN 7, unless  in scsi_sequential_lun_scan()
1379  * scsi_report_lun_scan - Scan using SCSI REPORT LUN results
1385  *   Fast scanning for modern (SCSI-3) devices by sending a REPORT LUN command.
1389  *   LUNs even if it's older than SCSI-3.
1392  *   If starget->no_report_luns is set, return 1 always.
1410 	struct Scsi_Host *shost = dev_to_shost(&starget->dev);  in scsi_report_lun_scan()
1417 	 * Only support SCSI-3 and up devices if BLIST_NOREPORTLUN is not set.  in scsi_report_lun_scan()
1418 	 * Also allow SCSI-2 if BLIST_REPORTLUN2 is set and host adapter does  in scsi_report_lun_scan()
1424 	if (starget->scsi_level < SCSI_2 &&  in scsi_report_lun_scan()
1425 	    starget->scsi_level != SCSI_UNKNOWN)  in scsi_report_lun_scan()
1427 	if (starget->scsi_level < SCSI_3 &&  in scsi_report_lun_scan()
1428 	    (!(bflags & BLIST_REPORTLUN2) || shost->max_lun <= 8))  in scsi_report_lun_scan()
1432 	if (starget->no_report_luns)  in scsi_report_lun_scan()
1461 	 * bytes 1 - 5: reserved, set to zero.  in scsi_report_lun_scan()
1466 	 * bytes 6 - 9: length of the command.  in scsi_report_lun_scan()
1517 	if (get_unaligned_be32(lun_data->scsi_lun) +  in scsi_report_lun_scan()
1519 		length = get_unaligned_be32(lun_data->scsi_lun) +  in scsi_report_lun_scan()
1524 	length = get_unaligned_be32(lun_data->scsi_lun);  in scsi_report_lun_scan()
1538 		if (lun > sdev->host->max_lun) {  in scsi_report_lun_scan()
1575 	struct scsi_device *sdev = ERR_PTR(-ENODEV);  in __scsi_add_device()
1576 	struct device *parent = &shost->shost_gendev;  in __scsi_add_device()
1580 		return ERR_PTR(-ENODEV);  in __scsi_add_device()
1584 		return ERR_PTR(-ENOMEM);  in __scsi_add_device()
1587 	mutex_lock(&shost->scan_mutex);  in __scsi_add_device()
1588 	if (!shost->async_scan)  in __scsi_add_device()
1596 	mutex_unlock(&shost->scan_mutex);  in __scsi_add_device()
1603 	put_device(&starget->dev);  in __scsi_add_device()
1624 	struct device *dev = &sdev->sdev_gendev;  in scsi_rescan_device()
1633 	 * in the power management core code when system resume is on-going.  in scsi_rescan_device()
1635 	if (sdev->sdev_state != SDEV_RUNNING ||  in scsi_rescan_device()
1636 	    blk_queue_pm_only(sdev->request_queue)) {  in scsi_rescan_device()
1637 		ret = -EWOULDBLOCK;  in scsi_rescan_device()
1644 	if (sdev->handler && sdev->handler->rescan)  in scsi_rescan_device()
1645 		sdev->handler->rescan(sdev);  in scsi_rescan_device()
1647 	if (dev->driver && try_module_get(dev->driver->owner)) {  in scsi_rescan_device()
1648 		struct scsi_driver *drv = to_scsi_driver(dev->driver);  in scsi_rescan_device()
1650 		if (drv->rescan)  in scsi_rescan_device()
1651 			drv->rescan(dev);  in scsi_rescan_device()
1652 		module_put(dev->driver->owner);  in scsi_rescan_device()
1670 	if (shost->this_id == id)  in __scsi_scan_target()
1701 						 starget->scsi_level, rescan);  in __scsi_scan_target()
1712 	put_device(&starget->dev);  in __scsi_scan_target()
1716  * scsi_scan_target - scan a target id, possibly including all LUNs on the target.
1745 	mutex_lock(&shost->scan_mutex);  in scsi_scan_target()
1746 	if (!shost->async_scan)  in scsi_scan_target()
1753 	mutex_unlock(&shost->scan_mutex);  in scsi_scan_target()
1764 		for (id = 0; id < shost->max_id; ++id) {  in scsi_scan_channel()
1774 			if (shost->reverse_ordering)  in scsi_scan_channel()
1778 				order_id = shost->max_id - id - 1;  in scsi_scan_channel()
1781 			__scsi_scan_target(&shost->shost_gendev, channel,  in scsi_scan_channel()
1785 		__scsi_scan_target(&shost->shost_gendev, channel,  in scsi_scan_channel()
1797 	if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) ||  in scsi_scan_host_selected()
1798 	    ((id != SCAN_WILD_CARD) && (id >= shost->max_id)) ||  in scsi_scan_host_selected()
1799 	    ((lun != SCAN_WILD_CARD) && (lun >= shost->max_lun)))  in scsi_scan_host_selected()
1800 		return -EINVAL;  in scsi_scan_host_selected()
1802 	mutex_lock(&shost->scan_mutex);  in scsi_scan_host_selected()
1803 	if (!shost->async_scan)  in scsi_scan_host_selected()
1808 			for (channel = 0; channel <= shost->max_channel;  in scsi_scan_host_selected()
1816 	mutex_unlock(&shost->scan_mutex);  in scsi_scan_host_selected()
1826 		if (sdev->sdev_state == SDEV_DEL)  in scsi_sysfs_add_devices()
1829 		if (sdev->is_visible)  in scsi_sysfs_add_devices()
1838  * scsi_prep_async_scan - prepare for an async scan
1855 	mutex_lock(&shost->scan_mutex);  in scsi_prep_async_scan()
1856 	if (shost->async_scan) {  in scsi_prep_async_scan()
1864 	data->shost = scsi_host_get(shost);  in scsi_prep_async_scan()
1865 	if (!data->shost)  in scsi_prep_async_scan()
1867 	init_completion(&data->prev_finished);  in scsi_prep_async_scan()
1869 	spin_lock_irqsave(shost->host_lock, flags);  in scsi_prep_async_scan()
1870 	shost->async_scan = 1;  in scsi_prep_async_scan()
1871 	spin_unlock_irqrestore(shost->host_lock, flags);  in scsi_prep_async_scan()
1872 	mutex_unlock(&shost->scan_mutex);  in scsi_prep_async_scan()
1876 		complete(&data->prev_finished);  in scsi_prep_async_scan()
1877 	list_add_tail(&data->list, &scanning_hosts);  in scsi_prep_async_scan()
1883 	mutex_unlock(&shost->scan_mutex);  in scsi_prep_async_scan()
1889  * scsi_finish_async_scan - asynchronous scan has finished
1904 	shost = data->shost;  in scsi_finish_async_scan()
1906 	mutex_lock(&shost->scan_mutex);  in scsi_finish_async_scan()
1908 	if (!shost->async_scan) {  in scsi_finish_async_scan()
1911 		mutex_unlock(&shost->scan_mutex);  in scsi_finish_async_scan()
1915 	wait_for_completion(&data->prev_finished);  in scsi_finish_async_scan()
1919 	spin_lock_irqsave(shost->host_lock, flags);  in scsi_finish_async_scan()
1920 	shost->async_scan = 0;  in scsi_finish_async_scan()
1921 	spin_unlock_irqrestore(shost->host_lock, flags);  in scsi_finish_async_scan()
1923 	mutex_unlock(&shost->scan_mutex);  in scsi_finish_async_scan()
1926 	list_del(&data->list);  in scsi_finish_async_scan()
1930 		complete(&next->prev_finished);  in scsi_finish_async_scan()
1941 	if (shost->hostt->scan_finished) {  in do_scsi_scan_host()
1943 		if (shost->hostt->scan_start)  in do_scsi_scan_host()
1944 			shost->hostt->scan_start(shost);  in do_scsi_scan_host()
1946 		while (!shost->hostt->scan_finished(shost, jiffies - start))  in do_scsi_scan_host()
1957 	struct Scsi_Host *shost = data->shost;  in do_scan_async()
1964  * scsi_scan_host - scan the given adapter
1984 	/* register with the async subsystem so wait_for_device_probe()  in scsi_scan_host()
1999 	spin_lock_irqsave(shost->host_lock, flags);  in scsi_forget_host()
2000 	list_for_each_entry(sdev, &shost->__devices, siblings) {  in scsi_forget_host()
2001 		if (sdev->sdev_state == SDEV_DEL)  in scsi_forget_host()
2003 		spin_unlock_irqrestore(shost->host_lock, flags);  in scsi_forget_host()
2007 	spin_unlock_irqrestore(shost->host_lock, flags);  in scsi_forget_host()