4 * Copyright (C) 2000 Eric Youngdale,
5 * Copyright (C) 2002 Patrick Mansfield
7 * The general scanning/probing algorithm is as follows, exceptions are
8 * made to it depending on device specific flags, compilation options, and
9 * global variable (boot or module load time) settings.
11 * A specific LUN is scanned via an INQUIRY command; if the LUN has a
12 * device attached, a scsi_device is allocated and setup for it.
14 * For every id of every channel on the given host:
16 * Scan LUN 0; if the target responds to LUN 0 (even if there is no
17 * device or storage attached to LUN 0):
19 * If LUN 0 has a device attached, allocate and setup a
22 * If target is SCSI-3 or up, issue a REPORT LUN, and scan
23 * all of the LUNs returned by the REPORT LUN; else,
24 * sequentially scan LUNs up until some maximum is reached,
25 * or a LUN is seen that cannot have a device attached to it.
28 #include <linux/module.h>
29 #include <linux/moduleparam.h>
30 #include <linux/init.h>
31 #include <linux/blkdev.h>
32 #include <asm/semaphore.h>
34 #include <scsi/scsi.h>
35 #include <scsi/scsi_cmnd.h>
36 #include <scsi/scsi_device.h>
37 #include <scsi/scsi_driver.h>
38 #include <scsi/scsi_devinfo.h>
39 #include <scsi/scsi_host.h>
40 #include <scsi/scsi_transport.h>
41 #include <scsi/scsi_eh.h>
43 #include "scsi_priv.h"
44 #include "scsi_logging.h"
46 #define ALLOC_FAILURE_MSG KERN_ERR "%s: Allocation failure during" \
47 " SCSI scanning, some SCSI devices might not be configured\n"
52 #define SCSI_TIMEOUT (2*HZ)
55 * Prefix values for the SCSI id's (stored in driverfs name field)
57 #define SCSI_UID_SER_NUM 'S'
58 #define SCSI_UID_UNKNOWN 'Z'
61 * Return values of some of the scanning functions.
63 * SCSI_SCAN_NO_RESPONSE: no valid response received from the target, this
64 * includes allocation or general failures preventing IO from being sent.
66 * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is available
69 * SCSI_SCAN_LUN_PRESENT: target responded, and a device is available on a
72 #define SCSI_SCAN_NO_RESPONSE 0
73 #define SCSI_SCAN_TARGET_PRESENT 1
74 #define SCSI_SCAN_LUN_PRESENT 2
76 static const char *scsi_null_device_strs = "nullnullnullnull";
78 #define MAX_SCSI_LUNS 512
80 #ifdef CONFIG_SCSI_MULTI_LUN
81 static unsigned int max_scsi_luns = MAX_SCSI_LUNS;
83 static unsigned int max_scsi_luns = 1;
86 module_param_named(max_luns, max_scsi_luns, int, S_IRUGO|S_IWUSR);
87 MODULE_PARM_DESC(max_luns,
88 "last scsi LUN (should be between 1 and 2^32-1)");
91 * max_scsi_report_luns: the maximum number of LUNS that will be
92 * returned from the REPORT LUNS command. 8 times this value must
93 * be allocated. In theory this could be up to an 8 byte value, but
94 * in practice, the maximum number of LUNs suppored by any device
97 static unsigned int max_scsi_report_luns = 511;
99 module_param_named(max_report_luns, max_scsi_report_luns, int, S_IRUGO|S_IWUSR);
100 MODULE_PARM_DESC(max_report_luns,
101 "REPORT LUNS maximum number of LUNS received (should be"
102 " between 1 and 16384)");
104 static unsigned int scsi_inq_timeout = SCSI_TIMEOUT/HZ+3;
106 module_param_named(inq_timeout, scsi_inq_timeout, int, S_IRUGO|S_IWUSR);
107 MODULE_PARM_DESC(inq_timeout,
108 "Timeout (in seconds) waiting for devices to answer INQUIRY."
109 " Default is 5. Some non-compliant devices need more.");
112 * scsi_unlock_floptical - unlock device via a special MODE SENSE command
113 * @sdev: scsi device to send command to
114 * @result: area to store the result of the MODE SENSE
117 * Send a vendor specific MODE SENSE (not a MODE SELECT) command.
118 * Called for BLIST_KEY devices.
120 static void scsi_unlock_floptical(struct scsi_device *sdev,
121 unsigned char *result)
123 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
125 printk(KERN_NOTICE "scsi: unlocking floptical drive\n");
126 scsi_cmd[0] = MODE_SENSE;
130 scsi_cmd[4] = 0x2a; /* size */
132 scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, result, 0x2a, NULL,
137 * print_inquiry - printk the inquiry information
138 * @inq_result: printk this SCSI INQUIRY
141 * printk the vendor, model, and other information found in the
142 * INQUIRY data in @inq_result.
145 * Remove this, and replace with a hotplug event that logs any
146 * relevant information.
148 static void print_inquiry(unsigned char *inq_result)
152 printk(KERN_NOTICE " Vendor: ");
153 for (i = 8; i < 16; i++)
154 if (inq_result[i] >= 0x20 && i < inq_result[4] + 5)
155 printk("%c", inq_result[i]);
160 for (i = 16; i < 32; i++)
161 if (inq_result[i] >= 0x20 && i < inq_result[4] + 5)
162 printk("%c", inq_result[i]);
167 for (i = 32; i < 36; i++)
168 if (inq_result[i] >= 0x20 && i < inq_result[4] + 5)
169 printk("%c", inq_result[i]);
175 i = inq_result[0] & 0x1f;
177 printk(KERN_NOTICE " Type: %s ",
179 MAX_SCSI_DEVICE_CODE ? scsi_device_types[i] :
181 printk(" ANSI SCSI revision: %02x",
182 inq_result[2] & 0x07);
183 if ((inq_result[2] & 0x07) == 1 && (inq_result[3] & 0x0f) == 1)
190 * scsi_alloc_sdev - allocate and setup a scsi_Device
193 * Allocate, initialize for io, and return a pointer to a scsi_Device.
194 * Stores the @shost, @channel, @id, and @lun in the scsi_Device, and
195 * adds scsi_Device to the appropriate list.
198 * scsi_Device pointer, or NULL on failure.
200 static struct scsi_device *scsi_alloc_sdev(struct scsi_target *starget,
201 unsigned int lun, void *hostdata)
203 struct scsi_device *sdev;
204 int display_failure_msg = 1, ret;
205 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
207 sdev = kzalloc(sizeof(*sdev) + shost->transportt->device_size,
212 sdev->vendor = scsi_null_device_strs;
213 sdev->model = scsi_null_device_strs;
214 sdev->rev = scsi_null_device_strs;
216 sdev->id = starget->id;
218 sdev->channel = starget->channel;
219 sdev->sdev_state = SDEV_CREATED;
220 INIT_LIST_HEAD(&sdev->siblings);
221 INIT_LIST_HEAD(&sdev->same_target_siblings);
222 INIT_LIST_HEAD(&sdev->cmd_list);
223 INIT_LIST_HEAD(&sdev->starved_entry);
224 spin_lock_init(&sdev->list_lock);
226 sdev->sdev_gendev.parent = get_device(&starget->dev);
227 sdev->sdev_target = starget;
229 /* usually NULL and set by ->slave_alloc instead */
230 sdev->hostdata = hostdata;
232 /* if the device needs this changing, it may do so in the
233 * slave_configure function */
234 sdev->max_device_blocked = SCSI_DEFAULT_DEVICE_BLOCKED;
237 * Some low level driver could use device->type
242 * Assume that the device will have handshaking problems,
243 * and then fix this field later if it turns out it
248 sdev->request_queue = scsi_alloc_queue(sdev);
249 if (!sdev->request_queue) {
250 /* release fn is set up in scsi_sysfs_device_initialise, so
251 * have to free and put manually here */
252 put_device(&starget->dev);
257 sdev->request_queue->queuedata = sdev;
258 scsi_adjust_queue_depth(sdev, 0, sdev->host->cmd_per_lun);
260 scsi_sysfs_device_initialize(sdev);
262 if (shost->hostt->slave_alloc) {
263 ret = shost->hostt->slave_alloc(sdev);
266 * if LLDD reports slave not present, don't clutter
267 * console with alloc failure messages
270 display_failure_msg = 0;
271 goto out_device_destroy;
278 transport_destroy_device(&sdev->sdev_gendev);
279 put_device(&sdev->sdev_gendev);
281 if (display_failure_msg)
282 printk(ALLOC_FAILURE_MSG, __FUNCTION__);
286 static void scsi_target_dev_release(struct device *dev)
288 struct device *parent = dev->parent;
289 struct scsi_target *starget = to_scsi_target(dev);
295 int scsi_is_target_device(const struct device *dev)
297 return dev->release == scsi_target_dev_release;
299 EXPORT_SYMBOL(scsi_is_target_device);
301 static struct scsi_target *__scsi_find_target(struct device *parent,
302 int channel, uint id)
304 struct scsi_target *starget, *found_starget = NULL;
305 struct Scsi_Host *shost = dev_to_shost(parent);
307 * Search for an existing target for this sdev.
309 list_for_each_entry(starget, &shost->__targets, siblings) {
310 if (starget->id == id &&
311 starget->channel == channel) {
312 found_starget = starget;
317 get_device(&found_starget->dev);
319 return found_starget;
322 static struct scsi_target *scsi_alloc_target(struct device *parent,
323 int channel, uint id)
325 struct Scsi_Host *shost = dev_to_shost(parent);
326 struct device *dev = NULL;
328 const int size = sizeof(struct scsi_target)
329 + shost->transportt->target_size;
330 struct scsi_target *starget;
331 struct scsi_target *found_target;
334 starget = kzalloc(size, GFP_KERNEL);
336 printk(KERN_ERR "%s: allocation failure\n", __FUNCTION__);
340 device_initialize(dev);
341 starget->reap_ref = 1;
342 dev->parent = get_device(parent);
343 dev->release = scsi_target_dev_release;
344 sprintf(dev->bus_id, "target%d:%d:%d",
345 shost->host_no, channel, id);
347 starget->channel = channel;
348 INIT_LIST_HEAD(&starget->siblings);
349 INIT_LIST_HEAD(&starget->devices);
350 starget->state = STARGET_RUNNING;
352 spin_lock_irqsave(shost->host_lock, flags);
354 found_target = __scsi_find_target(parent, channel, id);
358 list_add_tail(&starget->siblings, &shost->__targets);
359 spin_unlock_irqrestore(shost->host_lock, flags);
360 /* allocate and add */
361 transport_setup_device(dev);
362 error = device_add(dev);
364 dev_err(dev, "target device_add failed, error %d\n", error);
365 spin_lock_irqsave(shost->host_lock, flags);
366 list_del_init(&starget->siblings);
367 spin_unlock_irqrestore(shost->host_lock, flags);
368 transport_destroy_device(dev);
373 transport_add_device(dev);
374 if (shost->hostt->target_alloc) {
375 error = shost->hostt->target_alloc(starget);
378 dev_printk(KERN_ERR, dev, "target allocation failed, error %d\n", error);
379 /* don't want scsi_target_reap to do the final
380 * put because it will be under the host lock */
382 scsi_target_reap(starget);
391 found_target->reap_ref++;
392 spin_unlock_irqrestore(shost->host_lock, flags);
394 if (found_target->state != STARGET_DEL) {
398 /* Unfortunately, we found a dying target; need to
399 * wait until it's dead before we can get a new one */
400 put_device(&found_target->dev);
401 flush_scheduled_work();
405 static void scsi_target_reap_usercontext(void *data)
407 struct scsi_target *starget = data;
408 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
411 transport_remove_device(&starget->dev);
412 device_del(&starget->dev);
413 transport_destroy_device(&starget->dev);
414 spin_lock_irqsave(shost->host_lock, flags);
415 if (shost->hostt->target_destroy)
416 shost->hostt->target_destroy(starget);
417 list_del_init(&starget->siblings);
418 spin_unlock_irqrestore(shost->host_lock, flags);
419 put_device(&starget->dev);
423 * scsi_target_reap - check to see if target is in use and destroy if not
425 * @starget: target to be checked
427 * This is used after removing a LUN or doing a last put of the target
428 * it checks atomically that nothing is using the target and removes
431 void scsi_target_reap(struct scsi_target *starget)
433 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
436 spin_lock_irqsave(shost->host_lock, flags);
438 if (--starget->reap_ref == 0 && list_empty(&starget->devices)) {
439 BUG_ON(starget->state == STARGET_DEL);
440 starget->state = STARGET_DEL;
441 spin_unlock_irqrestore(shost->host_lock, flags);
442 execute_in_process_context(scsi_target_reap_usercontext,
443 starget, &starget->ew);
447 spin_unlock_irqrestore(shost->host_lock, flags);
453 * scsi_probe_lun - probe a single LUN using a SCSI INQUIRY
454 * @sdev: scsi_device to probe
455 * @inq_result: area to store the INQUIRY result
456 * @result_len: len of inq_result
457 * @bflags: store any bflags found here
460 * Probe the lun associated with @req using a standard SCSI INQUIRY;
462 * If the INQUIRY is successful, zero is returned and the
463 * INQUIRY data is in @inq_result; the scsi_level and INQUIRY length
464 * are copied to the scsi_device any flags value is stored in *@bflags.
466 static int scsi_probe_lun(struct scsi_device *sdev, char *inq_result,
467 int result_len, int *bflags)
469 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
470 int first_inquiry_len, try_inquiry_len, next_inquiry_len;
471 int response_len = 0;
472 int pass, count, result;
473 struct scsi_sense_hdr sshdr;
477 /* Perform up to 3 passes. The first pass uses a conservative
478 * transfer length of 36 unless sdev->inquiry_len specifies a
479 * different value. */
480 first_inquiry_len = sdev->inquiry_len ? sdev->inquiry_len : 36;
481 try_inquiry_len = first_inquiry_len;
485 SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev,
486 "scsi scan: INQUIRY pass %d length %d\n",
487 pass, try_inquiry_len));
489 /* Each pass gets up to three chances to ignore Unit Attention */
490 for (count = 0; count < 3; ++count) {
491 memset(scsi_cmd, 0, 6);
492 scsi_cmd[0] = INQUIRY;
493 scsi_cmd[4] = (unsigned char) try_inquiry_len;
495 memset(inq_result, 0, try_inquiry_len);
497 result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE,
498 inq_result, try_inquiry_len, &sshdr,
499 HZ / 2 + HZ * scsi_inq_timeout, 3);
501 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: INQUIRY %s "
503 result ? "failed" : "successful", result));
507 * not-ready to ready transition [asc/ascq=0x28/0x0]
508 * or power-on, reset [asc/ascq=0x29/0x0], continue.
509 * INQUIRY should not yield UNIT_ATTENTION
510 * but many buggy devices do so anyway.
512 if ((driver_byte(result) & DRIVER_SENSE) &&
513 scsi_sense_valid(&sshdr)) {
514 if ((sshdr.sense_key == UNIT_ATTENTION) &&
515 ((sshdr.asc == 0x28) ||
516 (sshdr.asc == 0x29)) &&
525 response_len = (unsigned char) inq_result[4] + 5;
526 if (response_len > 255)
527 response_len = first_inquiry_len; /* sanity */
530 * Get any flags for this device.
532 * XXX add a bflags to scsi_device, and replace the
533 * corresponding bit fields in scsi_device, so bflags
534 * need not be passed as an argument.
536 *bflags = scsi_get_device_flags(sdev, &inq_result[8],
539 /* When the first pass succeeds we gain information about
540 * what larger transfer lengths might work. */
542 if (BLIST_INQUIRY_36 & *bflags)
543 next_inquiry_len = 36;
544 else if (BLIST_INQUIRY_58 & *bflags)
545 next_inquiry_len = 58;
546 else if (sdev->inquiry_len)
547 next_inquiry_len = sdev->inquiry_len;
549 next_inquiry_len = response_len;
551 /* If more data is available perform the second pass */
552 if (next_inquiry_len > try_inquiry_len) {
553 try_inquiry_len = next_inquiry_len;
559 } else if (pass == 2) {
560 printk(KERN_INFO "scsi scan: %d byte inquiry failed. "
561 "Consider BLIST_INQUIRY_36 for this device\n",
564 /* If this pass failed, the third pass goes back and transfers
565 * the same amount as we successfully got in the first pass. */
566 try_inquiry_len = first_inquiry_len;
571 /* If the last transfer attempt got an error, assume the
572 * peripheral doesn't exist or is dead. */
576 /* Don't report any more data than the device says is valid */
577 sdev->inquiry_len = min(try_inquiry_len, response_len);
580 * XXX Abort if the response length is less than 36? If less than
581 * 32, the lookup of the device flags (above) could be invalid,
582 * and it would be possible to take an incorrect action - we do
583 * not want to hang because of a short INQUIRY. On the flip side,
584 * if the device is spun down or becoming ready (and so it gives a
585 * short INQUIRY), an abort here prevents any further use of the
586 * device, including spin up.
588 * Related to the above issue:
590 * XXX Devices (disk or all?) should be sent a TEST UNIT READY,
591 * and if not ready, sent a START_STOP to start (maybe spin up) and
592 * then send the INQUIRY again, since the INQUIRY can change after
593 * a device is initialized.
595 * Ideally, start a device if explicitly asked to do so. This
596 * assumes that a device is spun up on power on, spun down on
597 * request, and then spun up on request.
601 * The scanning code needs to know the scsi_level, even if no
602 * device is attached at LUN 0 (SCSI_SCAN_TARGET_PRESENT) so
603 * non-zero LUNs can be scanned.
605 sdev->scsi_level = inq_result[2] & 0x07;
606 if (sdev->scsi_level >= 2 ||
607 (sdev->scsi_level == 1 && (inq_result[3] & 0x0f) == 1))
609 sdev->sdev_target->scsi_level = sdev->scsi_level;
615 * scsi_add_lun - allocate and fully initialze a scsi_device
616 * @sdevscan: holds information to be stored in the new scsi_device
617 * @sdevnew: store the address of the newly allocated scsi_device
618 * @inq_result: holds the result of a previous INQUIRY to the LUN
619 * @bflags: black/white list flag
622 * Allocate and initialize a scsi_device matching sdevscan. Optionally
623 * set fields based on values in *@bflags. If @sdevnew is not
624 * NULL, store the address of the new scsi_device in *@sdevnew (needed
625 * when scanning a particular LUN).
628 * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device
629 * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized
631 static int scsi_add_lun(struct scsi_device *sdev, char *inq_result, int *bflags)
634 * XXX do not save the inquiry, since it can change underneath us,
635 * save just vendor/model/rev.
637 * Rather than save it and have an ioctl that retrieves the saved
638 * value, have an ioctl that executes the same INQUIRY code used
639 * in scsi_probe_lun, let user level programs doing INQUIRY
640 * scanning run at their own risk, or supply a user level program
641 * that can correctly scan.
643 sdev->inquiry = kmalloc(sdev->inquiry_len, GFP_ATOMIC);
644 if (sdev->inquiry == NULL) {
645 return SCSI_SCAN_NO_RESPONSE;
648 memcpy(sdev->inquiry, inq_result, sdev->inquiry_len);
649 sdev->vendor = (char *) (sdev->inquiry + 8);
650 sdev->model = (char *) (sdev->inquiry + 16);
651 sdev->rev = (char *) (sdev->inquiry + 32);
653 if (*bflags & BLIST_ISROM) {
655 * It would be better to modify sdev->type, and set
656 * sdev->removable, but then the print_inquiry() output
657 * would not show TYPE_ROM; if print_inquiry() is removed
658 * the issue goes away.
660 inq_result[0] = TYPE_ROM;
661 inq_result[1] |= 0x80; /* removable */
662 } else if (*bflags & BLIST_NO_ULD_ATTACH)
663 sdev->no_uld_attach = 1;
665 switch (sdev->type = (inq_result[0] & 0x1f)) {
672 case TYPE_MEDIUM_CHANGER:
684 printk(KERN_INFO "scsi: unknown device type %d\n", sdev->type);
687 print_inquiry(inq_result);
690 * For a peripheral qualifier (PQ) value of 1 (001b), the SCSI
691 * spec says: The device server is capable of supporting the
692 * specified peripheral device type on this logical unit. However,
693 * the physical device is not currently connected to this logical
696 * The above is vague, as it implies that we could treat 001 and
697 * 011 the same. Stay compatible with previous code, and create a
698 * scsi_device for a PQ of 1
700 * Don't set the device offline here; rather let the upper
701 * level drivers eval the PQ to decide whether they should
702 * attach. So remove ((inq_result[0] >> 5) & 7) == 1 check.
705 sdev->inq_periph_qual = (inq_result[0] >> 5) & 7;
706 sdev->removable = (0x80 & inq_result[1]) >> 7;
707 sdev->lockable = sdev->removable;
708 sdev->soft_reset = (inq_result[7] & 1) && ((inq_result[3] & 7) == 2);
710 if (sdev->scsi_level >= SCSI_3 || (sdev->inquiry_len > 56 &&
711 inq_result[56] & 0x04))
713 if (inq_result[7] & 0x60)
715 if (inq_result[7] & 0x10)
722 if ((sdev->scsi_level >= SCSI_2) && (inq_result[7] & 2) &&
723 !(*bflags & BLIST_NOTQ))
724 sdev->tagged_supported = 1;
726 * Some devices (Texel CD ROM drives) have handshaking problems
727 * when used with the Seagate controllers. borken is initialized
728 * to 1, and then set it to 0 here.
730 if ((*bflags & BLIST_BORKEN) == 0)
734 * Apparently some really broken devices (contrary to the SCSI
735 * standards) need to be selected without asserting ATN
737 if (*bflags & BLIST_SELECT_NO_ATN)
738 sdev->select_no_atn = 1;
741 * Maximum 512 sector transfer length
742 * broken RA4x00 Compaq Disk Array
744 if (*bflags & BLIST_MAX_512)
745 blk_queue_max_sectors(sdev->request_queue, 512);
748 * Some devices may not want to have a start command automatically
749 * issued when a device is added.
751 if (*bflags & BLIST_NOSTARTONADD)
752 sdev->no_start_on_add = 1;
754 if (*bflags & BLIST_SINGLELUN)
755 sdev->single_lun = 1;
758 sdev->use_10_for_rw = 1;
760 if (*bflags & BLIST_MS_SKIP_PAGE_08)
761 sdev->skip_ms_page_8 = 1;
763 if (*bflags & BLIST_MS_SKIP_PAGE_3F)
764 sdev->skip_ms_page_3f = 1;
766 if (*bflags & BLIST_USE_10_BYTE_MS)
767 sdev->use_10_for_ms = 1;
769 /* set the device running here so that slave configure
771 scsi_device_set_state(sdev, SDEV_RUNNING);
773 if (*bflags & BLIST_MS_192_BYTES_FOR_3F)
774 sdev->use_192_bytes_for_3f = 1;
776 if (*bflags & BLIST_NOT_LOCKABLE)
779 if (*bflags & BLIST_RETRY_HWERROR)
780 sdev->retry_hwerror = 1;
782 transport_configure_device(&sdev->sdev_gendev);
784 if (sdev->host->hostt->slave_configure) {
785 int ret = sdev->host->hostt->slave_configure(sdev);
788 * if LLDD reports slave not present, don't clutter
789 * console with alloc failure messages
792 sdev_printk(KERN_ERR, sdev,
793 "failed to configure device\n");
795 return SCSI_SCAN_NO_RESPONSE;
800 * Ok, the device is now all set up, we can
801 * register it and tell the rest of the kernel
804 if (scsi_sysfs_add_sdev(sdev) != 0)
805 return SCSI_SCAN_NO_RESPONSE;
807 return SCSI_SCAN_LUN_PRESENT;
810 static inline void scsi_destroy_sdev(struct scsi_device *sdev)
812 if (sdev->host->hostt->slave_destroy)
813 sdev->host->hostt->slave_destroy(sdev);
814 transport_destroy_device(&sdev->sdev_gendev);
815 put_device(&sdev->sdev_gendev);
818 #ifdef CONFIG_SCSI_LOGGING
820 * scsi_inq_str - print INQUIRY data from min to max index,
821 * strip trailing whitespace
822 * @buf: Output buffer with at least end-first+1 bytes of space
823 * @inq: Inquiry buffer (input)
824 * @first: Offset of string into inq
825 * @end: Index after last character in inq
827 static unsigned char *scsi_inq_str(unsigned char *buf, unsigned char *inq,
828 unsigned first, unsigned end)
830 unsigned term = 0, idx;
832 for (idx = 0; idx + first < end && idx + first < inq[4] + 5; idx++) {
833 if (inq[idx+first] > ' ') {
834 buf[idx] = inq[idx+first];
846 * scsi_probe_and_add_lun - probe a LUN, if a LUN is found add it
847 * @starget: pointer to target device structure
848 * @lun: LUN of target device
849 * @sdevscan: probe the LUN corresponding to this scsi_device
850 * @sdevnew: store the value of any new scsi_device allocated
851 * @bflagsp: store bflags here if not NULL
854 * Call scsi_probe_lun, if a LUN with an attached device is found,
855 * allocate and set it up by calling scsi_add_lun.
858 * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device
859 * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is
860 * attached at the LUN
861 * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized
863 static int scsi_probe_and_add_lun(struct scsi_target *starget,
864 uint lun, int *bflagsp,
865 struct scsi_device **sdevp, int rescan,
868 struct scsi_device *sdev;
869 unsigned char *result;
870 int bflags, res = SCSI_SCAN_NO_RESPONSE, result_len = 256;
871 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
874 * The rescan flag is used as an optimization, the first scan of a
875 * host adapter calls into here with rescan == 0.
877 sdev = scsi_device_lookup_by_target(starget, lun);
879 if (rescan || sdev->sdev_state != SDEV_CREATED) {
880 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
881 "scsi scan: device exists on %s\n",
882 sdev->sdev_gendev.bus_id));
886 scsi_device_put(sdev);
889 *bflagsp = scsi_get_device_flags(sdev,
892 return SCSI_SCAN_LUN_PRESENT;
894 scsi_device_put(sdev);
896 sdev = scsi_alloc_sdev(starget, lun, hostdata);
900 result = kmalloc(result_len, GFP_ATOMIC |
901 ((shost->unchecked_isa_dma) ? __GFP_DMA : 0));
905 if (scsi_probe_lun(sdev, result, result_len, &bflags))
906 goto out_free_result;
911 * result contains valid SCSI INQUIRY data.
913 if (((result[0] >> 5) == 3) && !(bflags & BLIST_ATTACH_PQ3)) {
915 * For a Peripheral qualifier 3 (011b), the SCSI
916 * spec says: The device server is not capable of
917 * supporting a physical device on this logical
920 * For disks, this implies that there is no
921 * logical disk configured at sdev->lun, but there
922 * is a target id responding.
924 SCSI_LOG_SCAN_BUS(2, sdev_printk(KERN_INFO, sdev, "scsi scan:"
925 " peripheral qualifier of 3, device not"
928 SCSI_LOG_SCAN_BUS(1, {
929 unsigned char vend[9];
930 unsigned char mod[17];
932 sdev_printk(KERN_INFO, sdev,
933 "scsi scan: consider passing scsi_mod."
934 "dev_flags=%s:%s:0x240 or 0x800240\n",
935 scsi_inq_str(vend, result, 8, 16),
936 scsi_inq_str(mod, result, 16, 32));
940 res = SCSI_SCAN_TARGET_PRESENT;
941 goto out_free_result;
945 * Non-standard SCSI targets may set the PDT to 0x1f (unknown or
946 * no device type) instead of using the Peripheral Qualifier to
947 * indicate that no LUN is present. For example, USB UFI does this.
949 if (starget->pdt_1f_for_no_lun && (result[0] & 0x1f) == 0x1f) {
950 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
951 "scsi scan: peripheral device type"
952 " of 31, no device added\n"));
953 res = SCSI_SCAN_TARGET_PRESENT;
954 goto out_free_result;
957 res = scsi_add_lun(sdev, result, &bflags);
958 if (res == SCSI_SCAN_LUN_PRESENT) {
959 if (bflags & BLIST_KEY) {
961 scsi_unlock_floptical(sdev, result);
968 if (res == SCSI_SCAN_LUN_PRESENT) {
970 if (scsi_device_get(sdev) == 0) {
973 __scsi_remove_device(sdev);
974 res = SCSI_SCAN_NO_RESPONSE;
978 scsi_destroy_sdev(sdev);
984 * scsi_sequential_lun_scan - sequentially scan a SCSI target
985 * @starget: pointer to target structure to scan
986 * @bflags: black/white list flag for LUN 0
989 * Generally, scan from LUN 1 (LUN 0 is assumed to already have been
990 * scanned) to some maximum lun until a LUN is found with no device
991 * attached. Use the bflags to figure out any oddities.
993 * Modifies sdevscan->lun.
995 static void scsi_sequential_lun_scan(struct scsi_target *starget,
996 int bflags, int scsi_level, int rescan)
998 unsigned int sparse_lun, lun, max_dev_lun;
999 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1001 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: Sequential scan of"
1002 "%s\n", starget->dev.bus_id));
1004 max_dev_lun = min(max_scsi_luns, shost->max_lun);
1006 * If this device is known to support sparse multiple units,
1007 * override the other settings, and scan all of them. Normally,
1008 * SCSI-3 devices should be scanned via the REPORT LUNS.
1010 if (bflags & BLIST_SPARSELUN) {
1011 max_dev_lun = shost->max_lun;
1017 * If less than SCSI_1_CSS, and no special lun scaning, stop
1018 * scanning; this matches 2.4 behaviour, but could just be a bug
1019 * (to continue scanning a SCSI_1_CSS device).
1021 * This test is broken. We might not have any device on lun0 for
1022 * a sparselun device, and if that's the case then how would we
1023 * know the real scsi_level, eh? It might make sense to just not
1024 * scan any SCSI_1 device for non-0 luns, but that check would best
1025 * go into scsi_alloc_sdev() and just have it return null when asked
1026 * to alloc an sdev for lun > 0 on an already found SCSI_1 device.
1028 if ((sdevscan->scsi_level < SCSI_1_CCS) &&
1029 ((bflags & (BLIST_FORCELUN | BLIST_SPARSELUN | BLIST_MAX5LUN))
1034 * If this device is known to support multiple units, override
1035 * the other settings, and scan all of them.
1037 if (bflags & BLIST_FORCELUN)
1038 max_dev_lun = shost->max_lun;
1040 * REGAL CDC-4X: avoid hang after LUN 4
1042 if (bflags & BLIST_MAX5LUN)
1043 max_dev_lun = min(5U, max_dev_lun);
1045 * Do not scan SCSI-2 or lower device past LUN 7, unless
1048 if (scsi_level < SCSI_3 && !(bflags & BLIST_LARGELUN))
1049 max_dev_lun = min(8U, max_dev_lun);
1052 * We have already scanned LUN 0, so start at LUN 1. Keep scanning
1053 * until we reach the max, or no LUN is found and we are not
1056 for (lun = 1; lun < max_dev_lun; ++lun)
1057 if ((scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan,
1058 NULL) != SCSI_SCAN_LUN_PRESENT) &&
1064 * scsilun_to_int: convert a scsi_lun to an int
1065 * @scsilun: struct scsi_lun to be converted.
1068 * Convert @scsilun from a struct scsi_lun to a four byte host byte-ordered
1069 * integer, and return the result. The caller must check for
1070 * truncation before using this function.
1073 * The struct scsi_lun is assumed to be four levels, with each level
1074 * effectively containing a SCSI byte-ordered (big endian) short; the
1075 * addressing bits of each level are ignored (the highest two bits).
1076 * For a description of the LUN format, post SCSI-3 see the SCSI
1077 * Architecture Model, for SCSI-3 see the SCSI Controller Commands.
1079 * Given a struct scsi_lun of: 0a 04 0b 03 00 00 00 00, this function returns
1080 * the integer: 0x0b030a04
1082 static int scsilun_to_int(struct scsi_lun *scsilun)
1088 for (i = 0; i < sizeof(lun); i += 2)
1089 lun = lun | (((scsilun->scsi_lun[i] << 8) |
1090 scsilun->scsi_lun[i + 1]) << (i * 8));
1095 * int_to_scsilun: reverts an int into a scsi_lun
1096 * @int: integer to be reverted
1097 * @scsilun: struct scsi_lun to be set.
1100 * Reverts the functionality of the scsilun_to_int, which packed
1101 * an 8-byte lun value into an int. This routine unpacks the int
1102 * back into the lun value.
1103 * Note: the scsilun_to_int() routine does not truly handle all
1104 * 8bytes of the lun value. This functions restores only as much
1105 * as was set by the routine.
1108 * Given an integer : 0x0b030a04, this function returns a
1109 * scsi_lun of : struct scsi_lun of: 0a 04 0b 03 00 00 00 00
1112 void int_to_scsilun(unsigned int lun, struct scsi_lun *scsilun)
1116 memset(scsilun->scsi_lun, 0, sizeof(scsilun->scsi_lun));
1118 for (i = 0; i < sizeof(lun); i += 2) {
1119 scsilun->scsi_lun[i] = (lun >> 8) & 0xFF;
1120 scsilun->scsi_lun[i+1] = lun & 0xFF;
1124 EXPORT_SYMBOL(int_to_scsilun);
1127 * scsi_report_lun_scan - Scan using SCSI REPORT LUN results
1128 * @sdevscan: scan the host, channel, and id of this scsi_device
1131 * If @sdevscan is for a SCSI-3 or up device, send a REPORT LUN
1132 * command, and scan the resulting list of LUNs by calling
1133 * scsi_probe_and_add_lun.
1135 * Modifies sdevscan->lun.
1138 * 0: scan completed (or no memory, so further scanning is futile)
1139 * 1: no report lun scan, or not configured
1141 static int scsi_report_lun_scan(struct scsi_target *starget, int bflags,
1145 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
1146 unsigned int length;
1148 unsigned int num_luns;
1149 unsigned int retries;
1151 struct scsi_lun *lunp, *lun_data;
1153 struct scsi_sense_hdr sshdr;
1154 struct scsi_device *sdev;
1155 struct Scsi_Host *shost = dev_to_shost(&starget->dev);
1159 * Only support SCSI-3 and up devices if BLIST_NOREPORTLUN is not set.
1160 * Also allow SCSI-2 if BLIST_REPORTLUN2 is set and host adapter does
1161 * support more than 8 LUNs.
1163 if (bflags & BLIST_NOREPORTLUN)
1165 if (starget->scsi_level < SCSI_2 &&
1166 starget->scsi_level != SCSI_UNKNOWN)
1168 if (starget->scsi_level < SCSI_3 &&
1169 (!(bflags & BLIST_REPORTLUN2) || shost->max_lun <= 8))
1171 if (bflags & BLIST_NOLUN)
1174 if (!(sdev = scsi_device_lookup_by_target(starget, 0))) {
1175 sdev = scsi_alloc_sdev(starget, 0, NULL);
1178 if (scsi_device_get(sdev))
1182 sprintf(devname, "host %d channel %d id %d",
1183 shost->host_no, sdev->channel, sdev->id);
1186 * Allocate enough to hold the header (the same size as one scsi_lun)
1187 * plus the max number of luns we are requesting.
1189 * Reallocating and trying again (with the exact amount we need)
1190 * would be nice, but then we need to somehow limit the size
1191 * allocated based on the available memory and the limits of
1192 * kmalloc - we don't want a kmalloc() failure of a huge value to
1193 * prevent us from finding any LUNs on this target.
1195 length = (max_scsi_report_luns + 1) * sizeof(struct scsi_lun);
1196 lun_data = kmalloc(length, GFP_ATOMIC |
1197 (sdev->host->unchecked_isa_dma ? __GFP_DMA : 0));
1199 printk(ALLOC_FAILURE_MSG, __FUNCTION__);
1203 scsi_cmd[0] = REPORT_LUNS;
1206 * bytes 1 - 5: reserved, set to zero.
1208 memset(&scsi_cmd[1], 0, 5);
1211 * bytes 6 - 9: length of the command.
1213 scsi_cmd[6] = (unsigned char) (length >> 24) & 0xff;
1214 scsi_cmd[7] = (unsigned char) (length >> 16) & 0xff;
1215 scsi_cmd[8] = (unsigned char) (length >> 8) & 0xff;
1216 scsi_cmd[9] = (unsigned char) length & 0xff;
1218 scsi_cmd[10] = 0; /* reserved */
1219 scsi_cmd[11] = 0; /* control */
1222 * We can get a UNIT ATTENTION, for example a power on/reset, so
1223 * retry a few times (like sd.c does for TEST UNIT READY).
1224 * Experience shows some combinations of adapter/devices get at
1225 * least two power on/resets.
1227 * Illegal requests (for devices that do not support REPORT LUNS)
1228 * should come through as a check condition, and will not generate
1231 for (retries = 0; retries < 3; retries++) {
1232 SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "scsi scan: Sending"
1233 " REPORT LUNS to %s (try %d)\n", devname,
1236 result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE,
1237 lun_data, length, &sshdr,
1238 SCSI_TIMEOUT + 4 * HZ, 3);
1240 SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "scsi scan: REPORT LUNS"
1241 " %s (try %d) result 0x%x\n", result
1242 ? "failed" : "successful", retries, result));
1245 else if (scsi_sense_valid(&sshdr)) {
1246 if (sshdr.sense_key != UNIT_ATTENTION)
1253 * The device probably does not support a REPORT LUN command
1260 * Get the length from the first four bytes of lun_data.
1262 data = (u8 *) lun_data->scsi_lun;
1263 length = ((data[0] << 24) | (data[1] << 16) |
1264 (data[2] << 8) | (data[3] << 0));
1266 num_luns = (length / sizeof(struct scsi_lun));
1267 if (num_luns > max_scsi_report_luns) {
1268 printk(KERN_WARNING "scsi: On %s only %d (max_scsi_report_luns)"
1269 " of %d luns reported, try increasing"
1270 " max_scsi_report_luns.\n", devname,
1271 max_scsi_report_luns, num_luns);
1272 num_luns = max_scsi_report_luns;
1275 SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO, sdev,
1276 "scsi scan: REPORT LUN scan\n"));
1279 * Scan the luns in lun_data. The entry at offset 0 is really
1280 * the header, so start at 1 and go up to and including num_luns.
1282 for (lunp = &lun_data[1]; lunp <= &lun_data[num_luns]; lunp++) {
1283 lun = scsilun_to_int(lunp);
1286 * Check if the unused part of lunp is non-zero, and so
1287 * does not fit in lun.
1289 if (memcmp(&lunp->scsi_lun[sizeof(lun)], "\0\0\0\0", 4)) {
1293 * Output an error displaying the LUN in byte order,
1294 * this differs from what linux would print for the
1295 * integer LUN value.
1297 printk(KERN_WARNING "scsi: %s lun 0x", devname);
1298 data = (char *)lunp->scsi_lun;
1299 for (i = 0; i < sizeof(struct scsi_lun); i++)
1300 printk("%02x", data[i]);
1301 printk(" has a LUN larger than currently supported.\n");
1302 } else if (lun > sdev->host->max_lun) {
1303 printk(KERN_WARNING "scsi: %s lun%d has a LUN larger"
1304 " than allowed by the host adapter\n",
1309 res = scsi_probe_and_add_lun(starget,
1310 lun, NULL, NULL, rescan, NULL);
1311 if (res == SCSI_SCAN_NO_RESPONSE) {
1313 * Got some results, but now none, abort.
1315 sdev_printk(KERN_ERR, sdev,
1316 "Unexpected response"
1317 " from lun %d while scanning, scan"
1327 scsi_device_put(sdev);
1328 if (sdev->sdev_state == SDEV_CREATED)
1330 * the sdev we used didn't appear in the report luns scan
1332 scsi_destroy_sdev(sdev);
1336 struct scsi_device *__scsi_add_device(struct Scsi_Host *shost, uint channel,
1337 uint id, uint lun, void *hostdata)
1339 struct scsi_device *sdev = ERR_PTR(-ENODEV);
1340 struct device *parent = &shost->shost_gendev;
1341 struct scsi_target *starget;
1343 starget = scsi_alloc_target(parent, channel, id);
1345 return ERR_PTR(-ENOMEM);
1347 get_device(&starget->dev);
1348 mutex_lock(&shost->scan_mutex);
1349 if (scsi_host_scan_allowed(shost))
1350 scsi_probe_and_add_lun(starget, lun, NULL, &sdev, 1, hostdata);
1351 mutex_unlock(&shost->scan_mutex);
1352 scsi_target_reap(starget);
1353 put_device(&starget->dev);
1357 EXPORT_SYMBOL(__scsi_add_device);
1359 int scsi_add_device(struct Scsi_Host *host, uint channel,
1360 uint target, uint lun)
1362 struct scsi_device *sdev =
1363 __scsi_add_device(host, channel, target, lun, NULL);
1365 return PTR_ERR(sdev);
1367 scsi_device_put(sdev);
1370 EXPORT_SYMBOL(scsi_add_device);
1372 void scsi_rescan_device(struct device *dev)
1374 struct scsi_driver *drv;
1379 drv = to_scsi_driver(dev->driver);
1380 if (try_module_get(drv->owner)) {
1383 module_put(drv->owner);
1386 EXPORT_SYMBOL(scsi_rescan_device);
1388 static void __scsi_scan_target(struct device *parent, unsigned int channel,
1389 unsigned int id, unsigned int lun, int rescan)
1391 struct Scsi_Host *shost = dev_to_shost(parent);
1394 struct scsi_target *starget;
1396 if (shost->this_id == id)
1398 * Don't scan the host adapter
1402 starget = scsi_alloc_target(parent, channel, id);
1406 get_device(&starget->dev);
1407 if (lun != SCAN_WILD_CARD) {
1409 * Scan for a specific host/chan/id/lun.
1411 scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan, NULL);
1416 * Scan LUN 0, if there is some response, scan further. Ideally, we
1417 * would not configure LUN 0 until all LUNs are scanned.
1419 res = scsi_probe_and_add_lun(starget, 0, &bflags, NULL, rescan, NULL);
1420 if (res == SCSI_SCAN_LUN_PRESENT || res == SCSI_SCAN_TARGET_PRESENT) {
1421 if (scsi_report_lun_scan(starget, bflags, rescan) != 0)
1423 * The REPORT LUN did not scan the target,
1424 * do a sequential scan.
1426 scsi_sequential_lun_scan(starget, bflags,
1427 starget->scsi_level, rescan);
1431 /* now determine if the target has any children at all
1432 * and if not, nuke it */
1433 scsi_target_reap(starget);
1435 put_device(&starget->dev);
1439 * scsi_scan_target - scan a target id, possibly including all LUNs on the
1441 * @parent: host to scan
1442 * @channel: channel to scan
1443 * @id: target id to scan
1444 * @lun: Specific LUN to scan or SCAN_WILD_CARD
1445 * @rescan: passed to LUN scanning routines
1448 * Scan the target id on @parent, @channel, and @id. Scan at least LUN 0,
1449 * and possibly all LUNs on the target id.
1451 * First try a REPORT LUN scan, if that does not scan the target, do a
1452 * sequential scan of LUNs on the target id.
1454 void scsi_scan_target(struct device *parent, unsigned int channel,
1455 unsigned int id, unsigned int lun, int rescan)
1457 struct Scsi_Host *shost = dev_to_shost(parent);
1459 mutex_lock(&shost->scan_mutex);
1460 if (scsi_host_scan_allowed(shost))
1461 __scsi_scan_target(parent, channel, id, lun, rescan);
1462 mutex_unlock(&shost->scan_mutex);
1464 EXPORT_SYMBOL(scsi_scan_target);
1466 static void scsi_scan_channel(struct Scsi_Host *shost, unsigned int channel,
1467 unsigned int id, unsigned int lun, int rescan)
1471 if (id == SCAN_WILD_CARD)
1472 for (id = 0; id < shost->max_id; ++id) {
1474 * XXX adapter drivers when possible (FCP, iSCSI)
1475 * could modify max_id to match the current max,
1476 * not the absolute max.
1478 * XXX add a shost id iterator, so for example,
1479 * the FC ID can be the same as a target id
1480 * without a huge overhead of sparse id's.
1482 if (shost->reverse_ordering)
1484 * Scan from high to low id.
1486 order_id = shost->max_id - id - 1;
1489 __scsi_scan_target(&shost->shost_gendev, channel,
1490 order_id, lun, rescan);
1493 __scsi_scan_target(&shost->shost_gendev, channel,
1497 int scsi_scan_host_selected(struct Scsi_Host *shost, unsigned int channel,
1498 unsigned int id, unsigned int lun, int rescan)
1500 SCSI_LOG_SCAN_BUS(3, shost_printk (KERN_INFO, shost,
1502 __FUNCTION__, channel, id, lun));
1504 if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) ||
1505 ((id != SCAN_WILD_CARD) && (id >= shost->max_id)) ||
1506 ((lun != SCAN_WILD_CARD) && (lun > shost->max_lun)))
1509 mutex_lock(&shost->scan_mutex);
1510 if (scsi_host_scan_allowed(shost)) {
1511 if (channel == SCAN_WILD_CARD)
1512 for (channel = 0; channel <= shost->max_channel;
1514 scsi_scan_channel(shost, channel, id, lun,
1517 scsi_scan_channel(shost, channel, id, lun, rescan);
1519 mutex_unlock(&shost->scan_mutex);
1525 * scsi_scan_host - scan the given adapter
1526 * @shost: adapter to scan
1528 void scsi_scan_host(struct Scsi_Host *shost)
1530 scsi_scan_host_selected(shost, SCAN_WILD_CARD, SCAN_WILD_CARD,
1533 EXPORT_SYMBOL(scsi_scan_host);
1535 void scsi_forget_host(struct Scsi_Host *shost)
1537 struct scsi_device *sdev;
1538 unsigned long flags;
1541 spin_lock_irqsave(shost->host_lock, flags);
1542 list_for_each_entry(sdev, &shost->__devices, siblings) {
1543 if (sdev->sdev_state == SDEV_DEL)
1545 spin_unlock_irqrestore(shost->host_lock, flags);
1546 __scsi_remove_device(sdev);
1549 spin_unlock_irqrestore(shost->host_lock, flags);
1553 * Function: scsi_get_host_dev()
1555 * Purpose: Create a scsi_device that points to the host adapter itself.
1557 * Arguments: SHpnt - Host that needs a scsi_device
1559 * Lock status: None assumed.
1561 * Returns: The scsi_device or NULL
1564 * Attach a single scsi_device to the Scsi_Host - this should
1565 * be made to look like a "pseudo-device" that points to the
1568 * Note - this device is not accessible from any high-level
1569 * drivers (including generics), which is probably not
1570 * optimal. We can add hooks later to attach
1572 struct scsi_device *scsi_get_host_dev(struct Scsi_Host *shost)
1574 struct scsi_device *sdev = NULL;
1575 struct scsi_target *starget;
1577 mutex_lock(&shost->scan_mutex);
1578 if (!scsi_host_scan_allowed(shost))
1580 starget = scsi_alloc_target(&shost->shost_gendev, 0, shost->this_id);
1584 sdev = scsi_alloc_sdev(starget, 0, NULL);
1586 sdev->sdev_gendev.parent = get_device(&starget->dev);
1589 put_device(&starget->dev);
1591 mutex_unlock(&shost->scan_mutex);
1594 EXPORT_SYMBOL(scsi_get_host_dev);
1597 * Function: scsi_free_host_dev()
1599 * Purpose: Free a scsi_device that points to the host adapter itself.
1601 * Arguments: SHpnt - Host that needs a scsi_device
1603 * Lock status: None assumed.
1609 void scsi_free_host_dev(struct scsi_device *sdev)
1611 BUG_ON(sdev->id != sdev->host->this_id);
1613 scsi_destroy_sdev(sdev);
1615 EXPORT_SYMBOL(scsi_free_host_dev);