drivers/scsi/scsi_devinfo.c - kernel/msm-4.9 - Gitiles


 #include <linux/blkdev.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/moduleparam.h>
 #include <linux/proc_fs.h>
 #include <linux/seq_file.h>

 #include <scsi/scsi_device.h>
 #include <scsi/scsi_devinfo.h>

 #include "scsi_priv.h"


 /*
  * scsi_dev_info_list: structure to hold black/white listed devices.
  */
 struct scsi_dev_info_list {
 	struct list_head dev_info_list;
 	char vendor[8];
 	char model[16];
 	unsigned flags;
 	unsigned compatible; /* for use with scsi_static_device_list entries */
 };


 static const char spaces[] = "                "; /* 16 of them */
 static unsigned scsi_default_dev_flags;
 static LIST_HEAD(scsi_dev_info_list);
 static char scsi_dev_flags[256];

 /*
  * scsi_static_device_list: deprecated list of devices that require
  * settings that differ from the default, includes black-listed (broken)
  * devices. The entries here are added to the tail of scsi_dev_info_list
  * via scsi_dev_info_list_init.
  *
  * Do not add to this list, use the command line or proc interface to add
  * to the scsi_dev_info_list. This table will eventually go away.
  */
 static struct {
 	char *vendor;
 	char *model;
 	char *revision;	/* revision known to be bad, unused */
 	unsigned flags;
 } scsi_static_device_list[] __initdata = {
 	/*
 	 * The following devices are known not to tolerate a lun != 0 scan
 	 * for one reason or another. Some will respond to all luns,
 	 * others will lock up.
 	 */
 	{"Aashima", "IMAGERY 2400SP", "1.03", BLIST_NOLUN},	/* locks up */
 	{"CHINON", "CD-ROM CDS-431", "H42", BLIST_NOLUN},	/* locks up */
 	{"CHINON", "CD-ROM CDS-535", "Q14", BLIST_NOLUN},	/* locks up */
 	{"DENON", "DRD-25X", "V", BLIST_NOLUN},			/* locks up */
 	{"HITACHI", "DK312C", "CM81", BLIST_NOLUN},	/* responds to all lun */
 	{"HITACHI", "DK314C", "CR21", BLIST_NOLUN},	/* responds to all lun */
 	{"IBM", "2104-DU3", NULL, BLIST_NOLUN},		/* locks up */
 	{"IBM", "2104-TU3", NULL, BLIST_NOLUN},		/* locks up */
 	{"IMS", "CDD521/10", "2.06", BLIST_NOLUN},	/* locks up */
 	{"MAXTOR", "XT-3280", "PR02", BLIST_NOLUN},	/* locks up */
 	{"MAXTOR", "XT-4380S", "B3C", BLIST_NOLUN},	/* locks up */
 	{"MAXTOR", "MXT-1240S", "I1.2", BLIST_NOLUN},	/* locks up */
 	{"MAXTOR", "XT-4170S", "B5A", BLIST_NOLUN},	/* locks up */
 	{"MAXTOR", "XT-8760S", "B7B", BLIST_NOLUN},	/* locks up */
 	{"MEDIAVIS", "RENO CD-ROMX2A", "2.03", BLIST_NOLUN},	/* responds to all lun */
 	{"MICROTEK", "ScanMakerIII", "2.30", BLIST_NOLUN},	/* responds to all lun */
 	{"NEC", "CD-ROM DRIVE:841", "1.0", BLIST_NOLUN},/* locks up */
 	{"PHILIPS", "PCA80SC", "V4-2", BLIST_NOLUN},	/* responds to all lun */
 	{"RODIME", "RO3000S", "2.33", BLIST_NOLUN},	/* locks up */
 	{"SUN", "SENA", NULL, BLIST_NOLUN},		/* responds to all luns */
 	/*
 	 * The following causes a failed REQUEST SENSE on lun 1 for
 	 * aha152x controller, which causes SCSI code to reset bus.
 	 */
 	{"SANYO", "CRD-250S", "1.20", BLIST_NOLUN},
 	/*
 	 * The following causes a failed REQUEST SENSE on lun 1 for
 	 * aha152x controller, which causes SCSI code to reset bus.
 	 */
 	{"SEAGATE", "ST157N", "\004|j", BLIST_NOLUN},
 	{"SEAGATE", "ST296", "921", BLIST_NOLUN},	/* responds to all lun */
 	{"SEAGATE", "ST1581", "6538", BLIST_NOLUN},	/* responds to all lun */
 	{"SONY", "CD-ROM CDU-541", "4.3d", BLIST_NOLUN},
 	{"SONY", "CD-ROM CDU-55S", "1.0i", BLIST_NOLUN},
 	{"SONY", "CD-ROM CDU-561", "1.7x", BLIST_NOLUN},
 	{"SONY", "CD-ROM CDU-8012", NULL, BLIST_NOLUN},
 	{"SONY", "SDT-5000", "3.17", BLIST_SELECT_NO_ATN},
 	{"TANDBERG", "TDC 3600", "U07", BLIST_NOLUN},	/* locks up */
 	{"TEAC", "CD-R55S", "1.0H", BLIST_NOLUN},	/* locks up */
 	/*
 	 * The following causes a failed REQUEST SENSE on lun 1 for
 	 * seagate controller, which causes SCSI code to reset bus.
 	 */
 	{"TEAC", "CD-ROM", "1.06", BLIST_NOLUN},
 	{"TEAC", "MT-2ST/45S2-27", "RV M", BLIST_NOLUN},	/* responds to all lun */
 	/*
 	 * The following causes a failed REQUEST SENSE on lun 1 for
 	 * seagate controller, which causes SCSI code to reset bus.
 	 */
 	{"HP", "C1750A", "3226", BLIST_NOLUN},		/* scanjet iic */
 	{"HP", "C1790A", "", BLIST_NOLUN},		/* scanjet iip */
 	{"HP", "C2500A", "", BLIST_NOLUN},		/* scanjet iicx */
 	{"MEDIAVIS", "CDR-H93MV", "1.31", BLIST_NOLUN},	/* locks up */
 	{"MICROTEK", "ScanMaker II", "5.61", BLIST_NOLUN},	/* responds to all lun */
 	{"MITSUMI", "CD-R CR-2201CS", "6119", BLIST_NOLUN},	/* locks up */
 	{"NEC", "D3856", "0009", BLIST_NOLUN},
 	{"QUANTUM", "LPS525S", "3110", BLIST_NOLUN},	/* locks up */
 	{"QUANTUM", "PD1225S", "3110", BLIST_NOLUN},	/* locks up */
 	{"QUANTUM", "FIREBALL ST4.3S", "0F0C", BLIST_NOLUN},	/* locks up */
 	{"RELISYS", "Scorpio", NULL, BLIST_NOLUN},	/* responds to all lun */
 	{"SANKYO", "CP525", "6.64", BLIST_NOLUN},	/* causes failed REQ SENSE, extra reset */
 	{"TEXEL", "CD-ROM", "1.06", BLIST_NOLUN},
 	{"transtec", "T5008", "0001", BLIST_NOREPORTLUN },
 	{"YAMAHA", "CDR100", "1.00", BLIST_NOLUN},	/* locks up */
 	{"YAMAHA", "CDR102", "1.00", BLIST_NOLUN},	/* locks up */
 	{"YAMAHA", "CRW8424S", "1.0", BLIST_NOLUN},	/* locks up */
 	{"YAMAHA", "CRW6416S", "1.0c", BLIST_NOLUN},	/* locks up */
 	{"", "Scanner", "1.80", BLIST_NOLUN},	/* responds to all lun */

 	/*
 	 * Other types of devices that have special flags.
 	 * Note that all USB devices should have the BLIST_INQUIRY_36 flag.
 	 */
 	{"3PARdata", "VV", NULL, BLIST_REPORTLUN2},
 	{"ADAPTEC", "AACRAID", NULL, BLIST_FORCELUN},
 	{"ADAPTEC", "Adaptec 5400S", NULL, BLIST_FORCELUN},
 	{"AFT PRO", "-IX CF", "0.0>", BLIST_FORCELUN},
 	{"BELKIN", "USB 2 HS-CF", "1.95",  BLIST_FORCELUN | BLIST_INQUIRY_36},
 	{"BROWNIE", "1600U3P", NULL, BLIST_NOREPORTLUN},
 	{"CANON", "IPUBJD", NULL, BLIST_SPARSELUN},
 	{"CBOX3", "USB Storage-SMC", "300A", BLIST_FORCELUN | BLIST_INQUIRY_36},
 	{"CMD", "CRA-7280", NULL, BLIST_SPARSELUN},	/* CMD RAID Controller */
 	{"CNSI", "G7324", NULL, BLIST_SPARSELUN},	/* Chaparral G7324 RAID */
 	{"CNSi", "G8324", NULL, BLIST_SPARSELUN},	/* Chaparral G8324 RAID */
 	{"COMPAQ", "ARRAY CONTROLLER", NULL, BLIST_SPARSELUN | BLIST_LARGELUN |
 		BLIST_MAX_512 | BLIST_REPORTLUN2},	/* Compaq RA4x00 */
 	{"COMPAQ", "LOGICAL VOLUME", NULL, BLIST_FORCELUN | BLIST_MAX_512}, /* Compaq RA4x00 */
 	{"COMPAQ", "CR3500", NULL, BLIST_FORCELUN},
 	{"COMPAQ", "MSA1000", NULL, BLIST_SPARSELUN | BLIST_NOSTARTONADD},
 	{"COMPAQ", "MSA1000 VOLUME", NULL, BLIST_SPARSELUN | BLIST_NOSTARTONADD},
 	{"COMPAQ", "HSV110", NULL, BLIST_REPORTLUN2 | BLIST_NOSTARTONADD},
 	{"DDN", "SAN DataDirector", "*", BLIST_SPARSELUN},
 	{"DEC", "HSG80", NULL, BLIST_REPORTLUN2 | BLIST_NOSTARTONADD},
 	{"DELL", "PV660F", NULL, BLIST_SPARSELUN},
 	{"DELL", "PV660F   PSEUDO", NULL, BLIST_SPARSELUN},
 	{"DELL", "PSEUDO DEVICE .", NULL, BLIST_SPARSELUN},	/* Dell PV 530F */
 	{"DELL", "PV530F", NULL, BLIST_SPARSELUN},
 	{"DELL", "PERCRAID", NULL, BLIST_FORCELUN},
 	{"DGC", "RAID", NULL, BLIST_SPARSELUN},	/* Dell PV 650F, storage on LUN 0 */
 	{"DGC", "DISK", NULL, BLIST_SPARSELUN},	/* Dell PV 650F, no storage on LUN 0 */
 	{"EMC", "SYMMETRIX", NULL, BLIST_SPARSELUN | BLIST_LARGELUN | BLIST_FORCELUN},
 	{"EMULEX", "MD21/S2     ESDI", NULL, BLIST_SINGLELUN},
 	{"FSC", "CentricStor", "*", BLIST_SPARSELUN | BLIST_LARGELUN},
 	{"Generic", "USB SD Reader", "1.00", BLIST_FORCELUN | BLIST_INQUIRY_36},
 	{"Generic", "USB Storage-SMC", "0180", BLIST_FORCELUN | BLIST_INQUIRY_36},
 	{"Generic", "USB Storage-SMC", "0207", BLIST_FORCELUN | BLIST_INQUIRY_36},
 	{"HITACHI", "DF400", "*", BLIST_SPARSELUN},
 	{"HITACHI", "DF500", "*", BLIST_SPARSELUN},
 	{"HITACHI", "DF600", "*", BLIST_SPARSELUN},
 	{"HP", "A6189A", NULL, BLIST_SPARSELUN | BLIST_LARGELUN},	/* HP VA7400 */
 	{"HP", "OPEN-", "*", BLIST_SPARSELUN | BLIST_LARGELUN}, /* HP XP Arrays */
 	{"HP", "NetRAID-4M", NULL, BLIST_FORCELUN},
 	{"HP", "HSV100", NULL, BLIST_REPORTLUN2 | BLIST_NOSTARTONADD},
 	{"HP", "C1557A", NULL, BLIST_FORCELUN},
 	{"HP", "C3323-300", "4269", BLIST_NOTQ},
 	{"HP", "C5713A", NULL, BLIST_NOREPORTLUN},
 	{"IBM", "AuSaV1S2", NULL, BLIST_FORCELUN},
 	{"IBM", "ProFibre 4000R", "*", BLIST_SPARSELUN | BLIST_LARGELUN},
 	{"IBM", "2105", NULL, BLIST_RETRY_HWERROR},
 	{"iomega", "jaz 1GB", "J.86", BLIST_NOTQ | BLIST_NOLUN},
 	{"IOMEGA", "Io20S         *F", NULL, BLIST_KEY},
 	{"INSITE", "Floptical   F*8I", NULL, BLIST_KEY},
 	{"INSITE", "I325VM", NULL, BLIST_KEY},
 	{"iRiver", "iFP Mass Driver", NULL, BLIST_NOT_LOCKABLE | BLIST_INQUIRY_36},
 	{"LASOUND", "CDX7405", "3.10", BLIST_MAX5LUN | BLIST_SINGLELUN},
 	{"MATSHITA", "PD-1", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
 	{"MATSHITA", "DMC-LC5", NULL, BLIST_NOT_LOCKABLE | BLIST_INQUIRY_36},
 	{"MATSHITA", "DMC-LC40", NULL, BLIST_NOT_LOCKABLE | BLIST_INQUIRY_36},
 	{"Medion", "Flash XL  MMC/SD", "2.6D", BLIST_FORCELUN},
 	{"MegaRAID", "LD", NULL, BLIST_FORCELUN},
 	{"MICROP", "4110", NULL, BLIST_NOTQ},
 	{"MYLEX", "DACARMRB", "*", BLIST_REPORTLUN2},
 	{"nCipher", "Fastness Crypto", NULL, BLIST_FORCELUN},
 	{"NAKAMICH", "MJ-4.8S", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
 	{"NAKAMICH", "MJ-5.16S", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
 	{"NEC", "PD-1 ODX654P", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
 	{"NRC", "MBR-7", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
 	{"NRC", "MBR-7.4", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
 	{"PIONEER", "CD-ROM DRM-600", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
 	{"PIONEER", "CD-ROM DRM-602X", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
 	{"PIONEER", "CD-ROM DRM-604X", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
 	{"PIONEER", "CD-ROM DRM-624X", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
 	{"REGAL", "CDC-4X", NULL, BLIST_MAX5LUN | BLIST_SINGLELUN},
 	{"SanDisk", "ImageMate CF-SD1", NULL, BLIST_FORCELUN},
 	{"SEAGATE", "ST34555N", "0930", BLIST_NOTQ},	/* Chokes on tagged INQUIRY */
 	{"SEAGATE", "ST3390N", "9546", BLIST_NOTQ},
 	{"SGI", "RAID3", "*", BLIST_SPARSELUN},
 	{"SGI", "RAID5", "*", BLIST_SPARSELUN},
 	{"SGI", "TP9100", "*", BLIST_REPORTLUN2},
 	{"SGI", "Universal Xport", "*", BLIST_NO_ULD_ATTACH},
 	{"IBM", "Universal Xport", "*", BLIST_NO_ULD_ATTACH},
 	{"SMSC", "USB 2 HS-CF", NULL, BLIST_SPARSELUN | BLIST_INQUIRY_36},
 	{"SONY", "CD-ROM CDU-8001", NULL, BLIST_BORKEN},
 	{"SONY", "TSL", NULL, BLIST_FORCELUN},		/* DDS3 & DDS4 autoloaders */
 	{"ST650211", "CF", NULL, BLIST_RETRY_HWERROR},
 	{"SUN", "T300", "*", BLIST_SPARSELUN},
 	{"SUN", "T4", "*", BLIST_SPARSELUN},
 	{"TEXEL", "CD-ROM", "1.06", BLIST_BORKEN},
 	{"TOSHIBA", "CDROM", NULL, BLIST_ISROM},
 	{"TOSHIBA", "CD-ROM", NULL, BLIST_ISROM},
 	{"USB2.0", "SMARTMEDIA/XD", NULL, BLIST_FORCELUN | BLIST_INQUIRY_36},
 	{"WangDAT", "Model 2600", "01.7", BLIST_SELECT_NO_ATN},
 	{"WangDAT", "Model 3200", "02.2", BLIST_SELECT_NO_ATN},
 	{"WangDAT", "Model 1300", "02.4", BLIST_SELECT_NO_ATN},
 	{"WDC WD25", "00JB-00FUA0", NULL, BLIST_NOREPORTLUN},
 	{"XYRATEX", "RS", "*", BLIST_SPARSELUN | BLIST_LARGELUN},
 	{"Zzyzx", "RocketStor 500S", NULL, BLIST_SPARSELUN},
 	{"Zzyzx", "RocketStor 2000", NULL, BLIST_SPARSELUN},
 	{ NULL, NULL, NULL, 0 },
 };

 /*
  * scsi_strcpy_devinfo: called from scsi_dev_info_list_add to copy into
  * devinfo vendor and model strings.
  */
 static void scsi_strcpy_devinfo(char *name, char *to, size_t to_length,
 				char *from, int compatible)
 {
 	size_t from_length;

 	from_length = strlen(from);
 	strncpy(to, from, min(to_length, from_length));
 	if (from_length < to_length) {
 		if (compatible) {
 			/*
 			 * NUL terminate the string if it is short.
 			 */
 			to[from_length] = '\0';
 		} else {
 			/*
 			 * space pad the string if it is short.
 			 */
 			strncpy(&to[from_length], spaces,
 				to_length - from_length);
 		}
 	}
 	if (from_length > to_length)
 		 printk(KERN_WARNING "%s: %s string '%s' is too long\n",
 			__FUNCTION__, name, from);
 }

 /**
  * scsi_dev_info_list_add: add one dev_info list entry.
  * @vendor:	vendor string
  * @model:	model (product) string
  * @strflags:	integer string
  * @flag:	if strflags NULL, use this flag value
  *
  * Description:
  * 	Create and add one dev_info entry for @vendor, @model, @strflags or
  * 	@flag. If @compatible, add to the tail of the list, do not space
  * 	pad, and set devinfo->compatible. The scsi_static_device_list entries
  * 	are added with @compatible 1 and @clfags NULL.
  *
  * Returns: 0 OK, -error on failure.
  **/
 static int scsi_dev_info_list_add(int compatible, char *vendor, char *model,
 			    char *strflags, int flags)
 {
 	struct scsi_dev_info_list *devinfo;

 	devinfo = kmalloc(sizeof(*devinfo), GFP_KERNEL);
 	if (!devinfo) {
 		printk(KERN_ERR "%s: no memory\n", __FUNCTION__);
 		return -ENOMEM;
 	}

 	scsi_strcpy_devinfo("vendor", devinfo->vendor, sizeof(devinfo->vendor),
 			    vendor, compatible);
 	scsi_strcpy_devinfo("model", devinfo->model, sizeof(devinfo->model),
 			    model, compatible);

 	if (strflags)
 		devinfo->flags = simple_strtoul(strflags, NULL, 0);
 	else
 		devinfo->flags = flags;

 	devinfo->compatible = compatible;

 	if (compatible)
 		list_add_tail(&devinfo->dev_info_list, &scsi_dev_info_list);
 	else
 		list_add(&devinfo->dev_info_list, &scsi_dev_info_list);

 	return 0;
 }

 /**
  * scsi_dev_info_list_add_str: parse dev_list and add to the
  * scsi_dev_info_list.
  * @dev_list:	string of device flags to add
  *
  * Description:
  * 	Parse dev_list, and add entries to the scsi_dev_info_list.
  * 	dev_list is of the form "vendor:product:flag,vendor:product:flag".
  * 	dev_list is modified via strsep. Can be called for command line
  * 	addition, for proc or mabye a sysfs interface.
  *
  * Returns: 0 if OK, -error on failure.
  **/
 static int scsi_dev_info_list_add_str(char *dev_list)
 {
 	char *vendor, *model, *strflags, *next;
 	char *next_check;
 	int res = 0;

 	next = dev_list;
 	if (next && next[0] == '"') {
 		/*
 		 * Ignore both the leading and trailing quote.
 		 */
 		next++;
 		next_check = ",\"";
 	} else {
 		next_check = ",";
 	}

 	/*
 	 * For the leading and trailing '"' case, the for loop comes
 	 * through the last time with vendor[0] == '\0'.
 	 */
 	for (vendor = strsep(&next, ":"); vendor && (vendor[0] != '\0')
 	     && (res == 0); vendor = strsep(&next, ":")) {
 		strflags = NULL;
 		model = strsep(&next, ":");
 		if (model)
 			strflags = strsep(&next, next_check);
 		if (!model || !strflags) {
 			printk(KERN_ERR "%s: bad dev info string '%s' '%s'"
 			       " '%s'\n", __FUNCTION__, vendor, model,
 			       strflags);
 			res = -EINVAL;
 		} else
 			res = scsi_dev_info_list_add(0 /* compatible */, vendor,
 						     model, strflags, 0);
 	}
 	return res;
 }

 /**
  * get_device_flags - get device specific flags from the dynamic device
  * list. Called during scan time.
  * @vendor:	vendor name
  * @model:	model name
  *
  * Description:
  *     Search the scsi_dev_info_list for an entry matching @vendor and
  *     @model, if found, return the matching flags value, else return
  *     the host or global default settings.
  **/
 int scsi_get_device_flags(struct scsi_device *sdev,
 			  const unsigned char *vendor,
 			  const unsigned char *model)
 {
 	struct scsi_dev_info_list *devinfo;
 	unsigned int bflags;

 	bflags = sdev->sdev_bflags;
 	if (!bflags)
 		bflags = scsi_default_dev_flags;

 	list_for_each_entry(devinfo, &scsi_dev_info_list, dev_info_list) {
 		if (devinfo->compatible) {
 			/*
 			 * Behave like the older version of get_device_flags.
 			 */
 			size_t max;
 			/*
 			 * XXX why skip leading spaces? If an odd INQUIRY
 			 * value, that should have been part of the
 			 * scsi_static_device_list[] entry, such as "  FOO"
 			 * rather than "FOO". Since this code is already
 			 * here, and we don't know what device it is
 			 * trying to work with, leave it as-is.
 			 */
 			max = 8;	/* max length of vendor */
 			while ((max > 0) && *vendor == ' ') {
 				max--;
 				vendor++;
 			}
 			/*
 			 * XXX removing the following strlen() would be
 			 * good, using it means that for a an entry not in
 			 * the list, we scan every byte of every vendor
 			 * listed in scsi_static_device_list[], and never match
 			 * a single one (and still have to compare at
 			 * least the first byte of each vendor).
 			 */
 			if (memcmp(devinfo->vendor, vendor,
 				    min(max, strlen(devinfo->vendor))))
 				continue;
 			/*
 			 * Skip spaces again.
 			 */
 			max = 16;	/* max length of model */
 			while ((max > 0) && *model == ' ') {
 				max--;
 				model++;
 			}
 			if (memcmp(devinfo->model, model,
 				   min(max, strlen(devinfo->model))))
 				continue;
 			return devinfo->flags;
 		} else {
 			if (!memcmp(devinfo->vendor, vendor,
 				     sizeof(devinfo->vendor)) &&
 			     !memcmp(devinfo->model, model,
 				      sizeof(devinfo->model)))
 				return devinfo->flags;
 		}
 	}
 	return bflags;
 }

 #ifdef CONFIG_SCSI_PROC_FS
 /*
  * proc_scsi_dev_info_read: dump the scsi_dev_info_list via
  * /proc/scsi/device_info
  */
 static int proc_scsi_devinfo_read(char *buffer, char **start,
 				  off_t offset, int length)
 {
 	struct scsi_dev_info_list *devinfo;
 	int size, len = 0;
 	off_t begin = 0;
 	off_t pos = 0;

 	list_for_each_entry(devinfo, &scsi_dev_info_list, dev_info_list) {
 		size = sprintf(buffer + len, "'%.8s' '%.16s' 0x%x\n",
 			devinfo->vendor, devinfo->model, devinfo->flags);
 		len += size;
 		pos = begin + len;
 		if (pos < offset) {
 			len = 0;
 			begin = pos;
 		}
 		if (pos > offset + length)
 			goto stop_output;
 	}

 stop_output:
 	*start = buffer + (offset - begin);	/* Start of wanted data */
 	len -= (offset - begin);	/* Start slop */
 	if (len > length)
 		len = length;	/* Ending slop */
 	return (len);
 }

 /*
  * proc_scsi_dev_info_write: allow additions to the scsi_dev_info_list via
  * /proc.
  *
  * Use: echo "vendor:model:flag" > /proc/scsi/device_info
  *
  * To add a black/white list entry for vendor and model with an integer
  * value of flag to the scsi device info list.
  */
 static int proc_scsi_devinfo_write(struct file *file, const char __user *buf,
 				   unsigned long length, void *data)
 {
 	char *buffer;
 	int err = length;

 	if (!buf || length>PAGE_SIZE)
 		return -EINVAL;
 	if (!(buffer = (char *) __get_free_page(GFP_KERNEL)))
 		return -ENOMEM;
 	if (copy_from_user(buffer, buf, length)) {
 		err =-EFAULT;
 		goto out;
 	}

 	if (length < PAGE_SIZE)
 		buffer[length] = '\0';
 	else if (buffer[PAGE_SIZE-1]) {
 		err = -EINVAL;
 		goto out;
 	}

 	scsi_dev_info_list_add_str(buffer);

 out:
 	free_page((unsigned long)buffer);
 	return err;
 }
 #endif /* CONFIG_SCSI_PROC_FS */

 module_param_string(dev_flags, scsi_dev_flags, sizeof(scsi_dev_flags), 0);
 MODULE_PARM_DESC(dev_flags,
 	 "Given scsi_dev_flags=vendor:model:flags[,v:m:f] add black/white"
 	 " list entries for vendor and model with an integer value of flags"
 	 " to the scsi device info list");

 module_param_named(default_dev_flags, scsi_default_dev_flags, int, S_IRUGO|S_IWUSR);
 MODULE_PARM_DESC(default_dev_flags,
 		 "scsi default device flag integer value");

 /**
  * scsi_dev_info_list_delete: called from scsi.c:exit_scsi to remove
  * 	the scsi_dev_info_list.
  **/
 void scsi_exit_devinfo(void)
 {
 	struct list_head *lh, *lh_next;
 	struct scsi_dev_info_list *devinfo;

 #ifdef CONFIG_SCSI_PROC_FS
 	remove_proc_entry("scsi/device_info", NULL);
 #endif

 	list_for_each_safe(lh, lh_next, &scsi_dev_info_list) {
 		devinfo = list_entry(lh, struct scsi_dev_info_list,
 				     dev_info_list);
 		kfree(devinfo);
 	}
 }

 /**
  * scsi_dev_list_init: set up the dynamic device list.
  * @dev_list:	string of device flags to add
  *
  * Description:
  * 	Add command line @dev_list entries, then add
  * 	scsi_static_device_list entries to the scsi device info list.
  **/
 int __init scsi_init_devinfo(void)
 {
 #ifdef CONFIG_SCSI_PROC_FS
 	struct proc_dir_entry *p;
 #endif
 	int error, i;

 	error = scsi_dev_info_list_add_str(scsi_dev_flags);
 	if (error)
 		return error;

 	for (i = 0; scsi_static_device_list[i].vendor; i++) {
 		error = scsi_dev_info_list_add(1 /* compatibile */,
 				scsi_static_device_list[i].vendor,
 				scsi_static_device_list[i].model,
 				NULL,
 				scsi_static_device_list[i].flags);
 		if (error)
 			goto out;
 	}

 #ifdef CONFIG_SCSI_PROC_FS
 	p = create_proc_entry("scsi/device_info", 0, NULL);
 	if (!p) {
 		error = -ENOMEM;
 		goto out;
 	}

 	p->owner = THIS_MODULE;
 	p->get_info = proc_scsi_devinfo_read;
 	p->write_proc = proc_scsi_devinfo_write;
 #endif /* CONFIG_SCSI_PROC_FS */

  out:
 	if (error)
 		scsi_exit_devinfo();
 	return error;
 }

	#include <linux/blkdev.h>
	#include <linux/init.h>
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/moduleparam.h>
	#include <linux/proc_fs.h>
	#include <linux/seq_file.h>

	#include <scsi/scsi_device.h>
	#include <scsi/scsi_devinfo.h>

	#include "scsi_priv.h"


	/*
	* scsi_dev_info_list: structure to hold black/white listed devices.
	*/
	struct scsi_dev_info_list {
	struct list_head dev_info_list;
	char vendor[8];
	char model[16];
	unsigned flags;
	unsigned compatible; /* for use with scsi_static_device_list entries */
	};


	static const char spaces[] = " "; /* 16 of them */
	static unsigned scsi_default_dev_flags;
	static LIST_HEAD(scsi_dev_info_list);
	static char scsi_dev_flags[256];

	/*
	* scsi_static_device_list: deprecated list of devices that require
	* settings that differ from the default, includes black-listed (broken)
	* devices. The entries here are added to the tail of scsi_dev_info_list
	* via scsi_dev_info_list_init.
	*
	* Do not add to this list, use the command line or proc interface to add
	* to the scsi_dev_info_list. This table will eventually go away.
	*/
	static struct {
	char *vendor;
	char *model;
	char revision; / revision known to be bad, unused */
	unsigned flags;
	} scsi_static_device_list[] __initdata = {
	/*
	* The following devices are known not to tolerate a lun != 0 scan
	* for one reason or another. Some will respond to all luns,
	* others will lock up.
	*/
	{"Aashima", "IMAGERY 2400SP", "1.03", BLIST_NOLUN}, /* locks up */
	{"CHINON", "CD-ROM CDS-431", "H42", BLIST_NOLUN}, /* locks up */
	{"CHINON", "CD-ROM CDS-535", "Q14", BLIST_NOLUN}, /* locks up */
	{"DENON", "DRD-25X", "V", BLIST_NOLUN}, /* locks up */
	{"HITACHI", "DK312C", "CM81", BLIST_NOLUN}, /* responds to all lun */
	{"HITACHI", "DK314C", "CR21", BLIST_NOLUN}, /* responds to all lun */
	{"IBM", "2104-DU3", NULL, BLIST_NOLUN}, /* locks up */
	{"IBM", "2104-TU3", NULL, BLIST_NOLUN}, /* locks up */
	{"IMS", "CDD521/10", "2.06", BLIST_NOLUN}, /* locks up */
	{"MAXTOR", "XT-3280", "PR02", BLIST_NOLUN}, /* locks up */
	{"MAXTOR", "XT-4380S", "B3C", BLIST_NOLUN}, /* locks up */
	{"MAXTOR", "MXT-1240S", "I1.2", BLIST_NOLUN}, /* locks up */
	{"MAXTOR", "XT-4170S", "B5A", BLIST_NOLUN}, /* locks up */
	{"MAXTOR", "XT-8760S", "B7B", BLIST_NOLUN}, /* locks up */
	{"MEDIAVIS", "RENO CD-ROMX2A", "2.03", BLIST_NOLUN}, /* responds to all lun */
	{"MICROTEK", "ScanMakerIII", "2.30", BLIST_NOLUN}, /* responds to all lun */
	{"NEC", "CD-ROM DRIVE:841", "1.0", BLIST_NOLUN},/* locks up */
	{"PHILIPS", "PCA80SC", "V4-2", BLIST_NOLUN}, /* responds to all lun */
	{"RODIME", "RO3000S", "2.33", BLIST_NOLUN}, /* locks up */
	{"SUN", "SENA", NULL, BLIST_NOLUN}, /* responds to all luns */
	/*
	* The following causes a failed REQUEST SENSE on lun 1 for
	* aha152x controller, which causes SCSI code to reset bus.
	*/
	{"SANYO", "CRD-250S", "1.20", BLIST_NOLUN},
	/*
	* The following causes a failed REQUEST SENSE on lun 1 for
	* aha152x controller, which causes SCSI code to reset bus.
	*/
	{"SEAGATE", "ST157N", "\004\|j", BLIST_NOLUN},
	{"SEAGATE", "ST296", "921", BLIST_NOLUN}, /* responds to all lun */
	{"SEAGATE", "ST1581", "6538", BLIST_NOLUN}, /* responds to all lun */
	{"SONY", "CD-ROM CDU-541", "4.3d", BLIST_NOLUN},
	{"SONY", "CD-ROM CDU-55S", "1.0i", BLIST_NOLUN},
	{"SONY", "CD-ROM CDU-561", "1.7x", BLIST_NOLUN},
	{"SONY", "CD-ROM CDU-8012", NULL, BLIST_NOLUN},
	{"SONY", "SDT-5000", "3.17", BLIST_SELECT_NO_ATN},
	{"TANDBERG", "TDC 3600", "U07", BLIST_NOLUN}, /* locks up */
	{"TEAC", "CD-R55S", "1.0H", BLIST_NOLUN}, /* locks up */
	/*
	* The following causes a failed REQUEST SENSE on lun 1 for
	* seagate controller, which causes SCSI code to reset bus.
	*/
	{"TEAC", "CD-ROM", "1.06", BLIST_NOLUN},
	{"TEAC", "MT-2ST/45S2-27", "RV M", BLIST_NOLUN}, /* responds to all lun */
	/*
	* The following causes a failed REQUEST SENSE on lun 1 for
	* seagate controller, which causes SCSI code to reset bus.
	*/
	{"HP", "C1750A", "3226", BLIST_NOLUN}, /* scanjet iic */
	{"HP", "C1790A", "", BLIST_NOLUN}, /* scanjet iip */
	{"HP", "C2500A", "", BLIST_NOLUN}, /* scanjet iicx */
	{"MEDIAVIS", "CDR-H93MV", "1.31", BLIST_NOLUN}, /* locks up */
	{"MICROTEK", "ScanMaker II", "5.61", BLIST_NOLUN}, /* responds to all lun */
	{"MITSUMI", "CD-R CR-2201CS", "6119", BLIST_NOLUN}, /* locks up */
	{"NEC", "D3856", "0009", BLIST_NOLUN},
	{"QUANTUM", "LPS525S", "3110", BLIST_NOLUN}, /* locks up */
	{"QUANTUM", "PD1225S", "3110", BLIST_NOLUN}, /* locks up */
	{"QUANTUM", "FIREBALL ST4.3S", "0F0C", BLIST_NOLUN}, /* locks up */
	{"RELISYS", "Scorpio", NULL, BLIST_NOLUN}, /* responds to all lun */
	{"SANKYO", "CP525", "6.64", BLIST_NOLUN}, /* causes failed REQ SENSE, extra reset */
	{"TEXEL", "CD-ROM", "1.06", BLIST_NOLUN},
	{"transtec", "T5008", "0001", BLIST_NOREPORTLUN },
	{"YAMAHA", "CDR100", "1.00", BLIST_NOLUN}, /* locks up */
	{"YAMAHA", "CDR102", "1.00", BLIST_NOLUN}, /* locks up */
	{"YAMAHA", "CRW8424S", "1.0", BLIST_NOLUN}, /* locks up */
	{"YAMAHA", "CRW6416S", "1.0c", BLIST_NOLUN}, /* locks up */
	{"", "Scanner", "1.80", BLIST_NOLUN}, /* responds to all lun */

	/*
	* Other types of devices that have special flags.
	* Note that all USB devices should have the BLIST_INQUIRY_36 flag.
	*/
	{"3PARdata", "VV", NULL, BLIST_REPORTLUN2},
	{"ADAPTEC", "AACRAID", NULL, BLIST_FORCELUN},
	{"ADAPTEC", "Adaptec 5400S", NULL, BLIST_FORCELUN},
	{"AFT PRO", "-IX CF", "0.0>", BLIST_FORCELUN},
	{"BELKIN", "USB 2 HS-CF", "1.95", BLIST_FORCELUN \| BLIST_INQUIRY_36},
	{"BROWNIE", "1600U3P", NULL, BLIST_NOREPORTLUN},
	{"CANON", "IPUBJD", NULL, BLIST_SPARSELUN},
	{"CBOX3", "USB Storage-SMC", "300A", BLIST_FORCELUN \| BLIST_INQUIRY_36},
	{"CMD", "CRA-7280", NULL, BLIST_SPARSELUN}, /* CMD RAID Controller */
	{"CNSI", "G7324", NULL, BLIST_SPARSELUN}, /* Chaparral G7324 RAID */
	{"CNSi", "G8324", NULL, BLIST_SPARSELUN}, /* Chaparral G8324 RAID */
	{"COMPAQ", "ARRAY CONTROLLER", NULL, BLIST_SPARSELUN \| BLIST_LARGELUN \|
	BLIST_MAX_512 \| BLIST_REPORTLUN2}, /* Compaq RA4x00 */
	{"COMPAQ", "LOGICAL VOLUME", NULL, BLIST_FORCELUN \| BLIST_MAX_512}, /* Compaq RA4x00 */
	{"COMPAQ", "CR3500", NULL, BLIST_FORCELUN},
	{"COMPAQ", "MSA1000", NULL, BLIST_SPARSELUN \| BLIST_NOSTARTONADD},
	{"COMPAQ", "MSA1000 VOLUME", NULL, BLIST_SPARSELUN \| BLIST_NOSTARTONADD},
	{"COMPAQ", "HSV110", NULL, BLIST_REPORTLUN2 \| BLIST_NOSTARTONADD},
	{"DDN", "SAN DataDirector", "*", BLIST_SPARSELUN},
	{"DEC", "HSG80", NULL, BLIST_REPORTLUN2 \| BLIST_NOSTARTONADD},
	{"DELL", "PV660F", NULL, BLIST_SPARSELUN},
	{"DELL", "PV660F PSEUDO", NULL, BLIST_SPARSELUN},
	{"DELL", "PSEUDO DEVICE .", NULL, BLIST_SPARSELUN}, /* Dell PV 530F */
	{"DELL", "PV530F", NULL, BLIST_SPARSELUN},
	{"DELL", "PERCRAID", NULL, BLIST_FORCELUN},
	{"DGC", "RAID", NULL, BLIST_SPARSELUN}, /* Dell PV 650F, storage on LUN 0 */
	{"DGC", "DISK", NULL, BLIST_SPARSELUN}, /* Dell PV 650F, no storage on LUN 0 */
	{"EMC", "SYMMETRIX", NULL, BLIST_SPARSELUN \| BLIST_LARGELUN \| BLIST_FORCELUN},
	{"EMULEX", "MD21/S2 ESDI", NULL, BLIST_SINGLELUN},
	{"FSC", "CentricStor", "*", BLIST_SPARSELUN \| BLIST_LARGELUN},
	{"Generic", "USB SD Reader", "1.00", BLIST_FORCELUN \| BLIST_INQUIRY_36},
	{"Generic", "USB Storage-SMC", "0180", BLIST_FORCELUN \| BLIST_INQUIRY_36},
	{"Generic", "USB Storage-SMC", "0207", BLIST_FORCELUN \| BLIST_INQUIRY_36},
	{"HITACHI", "DF400", "*", BLIST_SPARSELUN},
	{"HITACHI", "DF500", "*", BLIST_SPARSELUN},
	{"HITACHI", "DF600", "*", BLIST_SPARSELUN},
	{"HP", "A6189A", NULL, BLIST_SPARSELUN \| BLIST_LARGELUN}, /* HP VA7400 */
	{"HP", "OPEN-", "", BLIST_SPARSELUN \| BLIST_LARGELUN}, / HP XP Arrays */
	{"HP", "NetRAID-4M", NULL, BLIST_FORCELUN},
	{"HP", "HSV100", NULL, BLIST_REPORTLUN2 \| BLIST_NOSTARTONADD},
	{"HP", "C1557A", NULL, BLIST_FORCELUN},
	{"HP", "C3323-300", "4269", BLIST_NOTQ},
	{"HP", "C5713A", NULL, BLIST_NOREPORTLUN},
	{"IBM", "AuSaV1S2", NULL, BLIST_FORCELUN},
	{"IBM", "ProFibre 4000R", "*", BLIST_SPARSELUN \| BLIST_LARGELUN},
	{"IBM", "2105", NULL, BLIST_RETRY_HWERROR},
	{"iomega", "jaz 1GB", "J.86", BLIST_NOTQ \| BLIST_NOLUN},
	{"IOMEGA", "Io20S *F", NULL, BLIST_KEY},
	{"INSITE", "Floptical F*8I", NULL, BLIST_KEY},
	{"INSITE", "I325VM", NULL, BLIST_KEY},
	{"iRiver", "iFP Mass Driver", NULL, BLIST_NOT_LOCKABLE \| BLIST_INQUIRY_36},
	{"LASOUND", "CDX7405", "3.10", BLIST_MAX5LUN \| BLIST_SINGLELUN},
	{"MATSHITA", "PD-1", NULL, BLIST_FORCELUN \| BLIST_SINGLELUN},
	{"MATSHITA", "DMC-LC5", NULL, BLIST_NOT_LOCKABLE \| BLIST_INQUIRY_36},
	{"MATSHITA", "DMC-LC40", NULL, BLIST_NOT_LOCKABLE \| BLIST_INQUIRY_36},
	{"Medion", "Flash XL MMC/SD", "2.6D", BLIST_FORCELUN},
	{"MegaRAID", "LD", NULL, BLIST_FORCELUN},
	{"MICROP", "4110", NULL, BLIST_NOTQ},
	{"MYLEX", "DACARMRB", "*", BLIST_REPORTLUN2},
	{"nCipher", "Fastness Crypto", NULL, BLIST_FORCELUN},
	{"NAKAMICH", "MJ-4.8S", NULL, BLIST_FORCELUN \| BLIST_SINGLELUN},
	{"NAKAMICH", "MJ-5.16S", NULL, BLIST_FORCELUN \| BLIST_SINGLELUN},
	{"NEC", "PD-1 ODX654P", NULL, BLIST_FORCELUN \| BLIST_SINGLELUN},
	{"NRC", "MBR-7", NULL, BLIST_FORCELUN \| BLIST_SINGLELUN},
	{"NRC", "MBR-7.4", NULL, BLIST_FORCELUN \| BLIST_SINGLELUN},
	{"PIONEER", "CD-ROM DRM-600", NULL, BLIST_FORCELUN \| BLIST_SINGLELUN},
	{"PIONEER", "CD-ROM DRM-602X", NULL, BLIST_FORCELUN \| BLIST_SINGLELUN},
	{"PIONEER", "CD-ROM DRM-604X", NULL, BLIST_FORCELUN \| BLIST_SINGLELUN},
	{"PIONEER", "CD-ROM DRM-624X", NULL, BLIST_FORCELUN \| BLIST_SINGLELUN},
	{"REGAL", "CDC-4X", NULL, BLIST_MAX5LUN \| BLIST_SINGLELUN},
	{"SanDisk", "ImageMate CF-SD1", NULL, BLIST_FORCELUN},
	{"SEAGATE", "ST34555N", "0930", BLIST_NOTQ}, /* Chokes on tagged INQUIRY */
	{"SEAGATE", "ST3390N", "9546", BLIST_NOTQ},
	{"SGI", "RAID3", "*", BLIST_SPARSELUN},
	{"SGI", "RAID5", "*", BLIST_SPARSELUN},
	{"SGI", "TP9100", "*", BLIST_REPORTLUN2},
	{"SGI", "Universal Xport", "*", BLIST_NO_ULD_ATTACH},
	{"IBM", "Universal Xport", "*", BLIST_NO_ULD_ATTACH},
	{"SMSC", "USB 2 HS-CF", NULL, BLIST_SPARSELUN \| BLIST_INQUIRY_36},
	{"SONY", "CD-ROM CDU-8001", NULL, BLIST_BORKEN},
	{"SONY", "TSL", NULL, BLIST_FORCELUN}, /* DDS3 & DDS4 autoloaders */
	{"ST650211", "CF", NULL, BLIST_RETRY_HWERROR},
	{"SUN", "T300", "*", BLIST_SPARSELUN},
	{"SUN", "T4", "*", BLIST_SPARSELUN},
	{"TEXEL", "CD-ROM", "1.06", BLIST_BORKEN},
	{"TOSHIBA", "CDROM", NULL, BLIST_ISROM},
	{"TOSHIBA", "CD-ROM", NULL, BLIST_ISROM},
	{"USB2.0", "SMARTMEDIA/XD", NULL, BLIST_FORCELUN \| BLIST_INQUIRY_36},
	{"WangDAT", "Model 2600", "01.7", BLIST_SELECT_NO_ATN},
	{"WangDAT", "Model 3200", "02.2", BLIST_SELECT_NO_ATN},
	{"WangDAT", "Model 1300", "02.4", BLIST_SELECT_NO_ATN},
	{"WDC WD25", "00JB-00FUA0", NULL, BLIST_NOREPORTLUN},
	{"XYRATEX", "RS", "*", BLIST_SPARSELUN \| BLIST_LARGELUN},
	{"Zzyzx", "RocketStor 500S", NULL, BLIST_SPARSELUN},
	{"Zzyzx", "RocketStor 2000", NULL, BLIST_SPARSELUN},
	{ NULL, NULL, NULL, 0 },
	};

	/*
	* scsi_strcpy_devinfo: called from scsi_dev_info_list_add to copy into
	* devinfo vendor and model strings.
	*/
	static void scsi_strcpy_devinfo(char name, char to, size_t to_length,
	char *from, int compatible)
	{
	size_t from_length;

	from_length = strlen(from);
	strncpy(to, from, min(to_length, from_length));
	if (from_length < to_length) {
	if (compatible) {
	/*
	* NUL terminate the string if it is short.
	*/
	to[from_length] = '\0';
	} else {
	/*
	* space pad the string if it is short.
	*/
	strncpy(&to[from_length], spaces,
	to_length - from_length);
	}
	}
	if (from_length > to_length)
	printk(KERN_WARNING "%s: %s string '%s' is too long\n",
	__FUNCTION__, name, from);
	}

	/**
	* scsi_dev_info_list_add: add one dev_info list entry.
	* @vendor: vendor string
	* @model: model (product) string
	* @strflags: integer string
	* @flag: if strflags NULL, use this flag value
	*
	* Description:
	* Create and add one dev_info entry for @vendor, @model, @strflags or
	* @flag. If @compatible, add to the tail of the list, do not space
	* pad, and set devinfo->compatible. The scsi_static_device_list entries
	* are added with @compatible 1 and @clfags NULL.
	*
	* Returns: 0 OK, -error on failure.
	**/
	static int scsi_dev_info_list_add(int compatible, char vendor, char model,
	char *strflags, int flags)
	{
	struct scsi_dev_info_list *devinfo;

	devinfo = kmalloc(sizeof(*devinfo), GFP_KERNEL);
	if (!devinfo) {
	printk(KERN_ERR "%s: no memory\n", __FUNCTION__);
	return -ENOMEM;
	}

	scsi_strcpy_devinfo("vendor", devinfo->vendor, sizeof(devinfo->vendor),
	vendor, compatible);
	scsi_strcpy_devinfo("model", devinfo->model, sizeof(devinfo->model),
	model, compatible);

	if (strflags)
	devinfo->flags = simple_strtoul(strflags, NULL, 0);
	else
	devinfo->flags = flags;

	devinfo->compatible = compatible;

	if (compatible)
	list_add_tail(&devinfo->dev_info_list, &scsi_dev_info_list);
	else
	list_add(&devinfo->dev_info_list, &scsi_dev_info_list);

	return 0;
	}

	/**
	* scsi_dev_info_list_add_str: parse dev_list and add to the
	* scsi_dev_info_list.
	* @dev_list: string of device flags to add
	*
	* Description:
	* Parse dev_list, and add entries to the scsi_dev_info_list.
	* dev_list is of the form "vendor:product:flag,vendor:product:flag".
	* dev_list is modified via strsep. Can be called for command line
	* addition, for proc or mabye a sysfs interface.
	*
	* Returns: 0 if OK, -error on failure.
	**/
	static int scsi_dev_info_list_add_str(char *dev_list)
	{
	char vendor, model, strflags, next;
	char *next_check;
	int res = 0;

	next = dev_list;
	if (next && next[0] == '"') {
	/*
	* Ignore both the leading and trailing quote.
	*/
	next++;
	next_check = ",\"";
	} else {
	next_check = ",";
	}

	/*
	* For the leading and trailing '"' case, the for loop comes
	* through the last time with vendor[0] == '\0'.
	*/
	for (vendor = strsep(&next, ":"); vendor && (vendor[0] != '\0')
	&& (res == 0); vendor = strsep(&next, ":")) {
	strflags = NULL;
	model = strsep(&next, ":");
	if (model)
	strflags = strsep(&next, next_check);
	if (!model \|\| !strflags) {
	printk(KERN_ERR "%s: bad dev info string '%s' '%s'"
	" '%s'\n", __FUNCTION__, vendor, model,
	strflags);
	res = -EINVAL;
	} else
	res = scsi_dev_info_list_add(0 /* compatible */, vendor,
	model, strflags, 0);
	}
	return res;
	}

	/**
	* get_device_flags - get device specific flags from the dynamic device
	* list. Called during scan time.
	* @vendor: vendor name
	* @model: model name
	*
	* Description:
	* Search the scsi_dev_info_list for an entry matching @vendor and
	* @model, if found, return the matching flags value, else return
	* the host or global default settings.
	**/
	int scsi_get_device_flags(struct scsi_device *sdev,
	const unsigned char *vendor,
	const unsigned char *model)
	{
	struct scsi_dev_info_list *devinfo;
	unsigned int bflags;

	bflags = sdev->sdev_bflags;
	if (!bflags)
	bflags = scsi_default_dev_flags;

	list_for_each_entry(devinfo, &scsi_dev_info_list, dev_info_list) {
	if (devinfo->compatible) {
	/*
	* Behave like the older version of get_device_flags.
	*/
	size_t max;
	/*
	* XXX why skip leading spaces? If an odd INQUIRY
	* value, that should have been part of the
	* scsi_static_device_list[] entry, such as " FOO"
	* rather than "FOO". Since this code is already
	* here, and we don't know what device it is
	* trying to work with, leave it as-is.
	*/
	max = 8; /* max length of vendor */
	while ((max > 0) && *vendor == ' ') {
	max--;
	vendor++;
	}
	/*
	* XXX removing the following strlen() would be
	* good, using it means that for a an entry not in
	* the list, we scan every byte of every vendor
	* listed in scsi_static_device_list[], and never match
	* a single one (and still have to compare at
	* least the first byte of each vendor).
	*/
	if (memcmp(devinfo->vendor, vendor,
	min(max, strlen(devinfo->vendor))))
	continue;
	/*
	* Skip spaces again.
	*/
	max = 16; /* max length of model */
	while ((max > 0) && *model == ' ') {
	max--;
	model++;
	}
	if (memcmp(devinfo->model, model,
	min(max, strlen(devinfo->model))))
	continue;
	return devinfo->flags;
	} else {
	if (!memcmp(devinfo->vendor, vendor,
	sizeof(devinfo->vendor)) &&
	!memcmp(devinfo->model, model,
	sizeof(devinfo->model)))
	return devinfo->flags;
	}
	}
	return bflags;
	}

	#ifdef CONFIG_SCSI_PROC_FS
	/*
	* proc_scsi_dev_info_read: dump the scsi_dev_info_list via
	* /proc/scsi/device_info
	*/
	static int proc_scsi_devinfo_read(char buffer, char *start,
	off_t offset, int length)
	{
	struct scsi_dev_info_list *devinfo;
	int size, len = 0;
	off_t begin = 0;
	off_t pos = 0;

	list_for_each_entry(devinfo, &scsi_dev_info_list, dev_info_list) {
	size = sprintf(buffer + len, "'%.8s' '%.16s' 0x%x\n",
	devinfo->vendor, devinfo->model, devinfo->flags);
	len += size;
	pos = begin + len;
	if (pos < offset) {
	len = 0;
	begin = pos;
	}
	if (pos > offset + length)
	goto stop_output;
	}

	stop_output:
	start = buffer + (offset - begin); / Start of wanted data */
	len -= (offset - begin); /* Start slop */
	if (len > length)
	len = length; /* Ending slop */
	return (len);
	}

	/*
	* proc_scsi_dev_info_write: allow additions to the scsi_dev_info_list via
	* /proc.
	*
	* Use: echo "vendor:model:flag" > /proc/scsi/device_info
	*
	* To add a black/white list entry for vendor and model with an integer
	* value of flag to the scsi device info list.
	*/
	static int proc_scsi_devinfo_write(struct file file, const char __user buf,
	unsigned long length, void *data)
	{
	char *buffer;
	int err = length;

	if (!buf \|\| length>PAGE_SIZE)
	return -EINVAL;
	if (!(buffer = (char *) __get_free_page(GFP_KERNEL)))
	return -ENOMEM;
	if (copy_from_user(buffer, buf, length)) {
	err =-EFAULT;
	goto out;
	}

	if (length < PAGE_SIZE)
	buffer[length] = '\0';
	else if (buffer[PAGE_SIZE-1]) {
	err = -EINVAL;
	goto out;
	}

	scsi_dev_info_list_add_str(buffer);

	out:
	free_page((unsigned long)buffer);
	return err;
	}
	#endif /* CONFIG_SCSI_PROC_FS */

	module_param_string(dev_flags, scsi_dev_flags, sizeof(scsi_dev_flags), 0);
	MODULE_PARM_DESC(dev_flags,
	"Given scsi_dev_flags=vendor:model:flags[,v:m:f] add black/white"
	" list entries for vendor and model with an integer value of flags"
	" to the scsi device info list");

	module_param_named(default_dev_flags, scsi_default_dev_flags, int, S_IRUGO\|S_IWUSR);
	MODULE_PARM_DESC(default_dev_flags,
	"scsi default device flag integer value");

	/**
	* scsi_dev_info_list_delete: called from scsi.c:exit_scsi to remove
	* the scsi_dev_info_list.
	**/
	void scsi_exit_devinfo(void)
	{
	struct list_head lh, lh_next;
	struct scsi_dev_info_list *devinfo;

	#ifdef CONFIG_SCSI_PROC_FS
	remove_proc_entry("scsi/device_info", NULL);
	#endif

	list_for_each_safe(lh, lh_next, &scsi_dev_info_list) {
	devinfo = list_entry(lh, struct scsi_dev_info_list,
	dev_info_list);
	kfree(devinfo);
	}
	}

	/**
	* scsi_dev_list_init: set up the dynamic device list.
	* @dev_list: string of device flags to add
	*
	* Description:
	* Add command line @dev_list entries, then add
	* scsi_static_device_list entries to the scsi device info list.
	**/
	int __init scsi_init_devinfo(void)
	{
	#ifdef CONFIG_SCSI_PROC_FS
	struct proc_dir_entry *p;
	#endif
	int error, i;

	error = scsi_dev_info_list_add_str(scsi_dev_flags);
	if (error)
	return error;

	for (i = 0; scsi_static_device_list[i].vendor; i++) {
	error = scsi_dev_info_list_add(1 /* compatibile */,
	scsi_static_device_list[i].vendor,
	scsi_static_device_list[i].model,
	NULL,
	scsi_static_device_list[i].flags);
	if (error)
	goto out;
	}

	#ifdef CONFIG_SCSI_PROC_FS
	p = create_proc_entry("scsi/device_info", 0, NULL);
	if (!p) {
	error = -ENOMEM;
	goto out;
	}

	p->owner = THIS_MODULE;
	p->get_info = proc_scsi_devinfo_read;
	p->write_proc = proc_scsi_devinfo_write;
	#endif /* CONFIG_SCSI_PROC_FS */

	out:
	if (error)
	scsi_exit_devinfo();
	return error;
	}