text: // SPDX-License-Identifier: GPL-2.0
  
  #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 <linux/slab.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];
  	blist_flags_t flags;
  	unsigned compatible; /* for use with scsi_static_device_list entries */
  };
  
  struct scsi_dev_info_list_table {
  	struct list_head node;	/* our node for being on the master list */
  	struct list_head scsi_dev_info_list; /* head of dev info list */
  	const char *name;	/* name of list for /proc (NULL for global) */
  	int key;		/* unique numeric identifier */
  };
  
  
  static blist_flags_t 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 */
  	blist_flags_t 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},
  	{"AIX", "VDASD", NULL, BLIST_TRY_VPD_PAGES},
  	{"AFT PRO", "-IX CF", "0.0>", BLIST_FORCELUN},
  	{"BELKIN", "USB 2 HS-CF", "1.95",  BLIST_FORCELUN | BLIST_INQUIRY_36},
  	{"BROWNIE", "1200U3P", NULL, BLIST_NOREPORTLUN},
  	{"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",  "Invista", "*", BLIST_SPARSELUN | BLIST_LARGELUN},
  	{"EMC", "SYMMETRIX", NULL, BLIST_SPARSELUN | BLIST_LARGELUN | BLIST_REPORTLUN2},
  	{"EMULEX", "MD21/S2     ESDI", NULL, BLIST_SINGLELUN},
  	{"easyRAID", "16P", NULL, BLIST_NOREPORTLUN},
  	{"easyRAID", "X6P", NULL, BLIST_NOREPORTLUN},
  	{"easyRAID", "F8", NULL, BLIST_NOREPORTLUN},
  	{"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_REPORTLUN2},
  	{"HITACHI", "DF500", "*", BLIST_REPORTLUN2},
  	{"HITACHI", "DISK-SUBSYSTEM", "*", BLIST_REPORTLUN2},
  	{"HITACHI", "HUS1530", "*", BLIST_NO_DIF},
  	{"HITACHI", "OPEN-", "*", BLIST_REPORTLUN2 | BLIST_TRY_VPD_PAGES},
  	{"HITACHI", "OP-C-", "*", BLIST_SPARSELUN | BLIST_LARGELUN},
  	{"HITACHI", "3380-", "*", BLIST_SPARSELUN | BLIST_LARGELUN},
  	{"HITACHI", "3390-", "*", BLIST_SPARSELUN | BLIST_LARGELUN},
  	{"HITACHI", "6586-", "*", BLIST_SPARSELUN | BLIST_LARGELUN},
  	{"HITACHI", "6588-", "*", BLIST_SPARSELUN | BLIST_LARGELUN},
  	{"HP", "A6189A", NULL, BLIST_SPARSELUN | BLIST_LARGELUN},	/* HP VA7400 */
  	{"HP", "OPEN-", "*", BLIST_REPORTLUN2}, /* 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},
  	{"HP", "DF400", "*", BLIST_SPARSELUN | BLIST_LARGELUN},
  	{"HP", "DF500", "*", BLIST_SPARSELUN | BLIST_LARGELUN},
  	{"HP", "DF600", "*", BLIST_SPARSELUN | BLIST_LARGELUN},
  	{"HP", "OP-C-", "*", BLIST_SPARSELUN | BLIST_LARGELUN},
  	{"HP", "3380-", "*", BLIST_SPARSELUN | BLIST_LARGELUN},
  	{"HP", "3390-", "*", BLIST_SPARSELUN | BLIST_LARGELUN},
  	{"HP", "6586-", "*", BLIST_SPARSELUN | BLIST_LARGELUN},
  	{"HP", "6588-", "*", BLIST_SPARSELUN | BLIST_LARGELUN},
  	{"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", "ZIP", NULL, BLIST_NOTQ | BLIST_NOLUN},
  	{"IOMEGA", "Io20S         *F", NULL, BLIST_KEY},
  	{"INSITE", "Floptical   F*8I", NULL, BLIST_KEY},
  	{"INSITE", "I325VM", NULL, BLIST_KEY},
  	{"Intel", "Multi-Flex", NULL, BLIST_NO_RSOC},
  	{"iRiver", "iFP Mass Driver", NULL, BLIST_NOT_LOCKABLE | BLIST_INQUIRY_36},
  	{"LASOUND", "CDX7405", "3.10", BLIST_MAX5LUN | BLIST_SINGLELUN},
  	{"Marvell", "Console", NULL, BLIST_SKIP_VPD_PAGES},
  	{"Marvell", "91xx Config", "1.01", BLIST_SKIP_VPD_PAGES},
  	{"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},
  	{"MSFT", "Virtual HD", NULL, BLIST_NO_RSOC},
  	{"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},
  	{"NEC", "iStorage", NULL, BLIST_REPORTLUN2},
  	{"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},
  	{"Promise", "VTrak E610f", NULL, BLIST_SPARSELUN | BLIST_NO_RSOC},
  	{"Promise", "", NULL, BLIST_SPARSELUN},
  	{"QEMU", "QEMU CD-ROM", NULL, BLIST_SKIP_VPD_PAGES},
  	{"QNAP", "iSCSI Storage", NULL, BLIST_MAX_1024},
  	{"SYNOLOGY", "iSCSI Storage", NULL, BLIST_MAX_1024},
  	{"QUANTUM", "XP34301", "1071", BLIST_NOTQ},
  	{"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},
  	{"SEAGATE", "ST900MM0006", NULL, BLIST_SKIP_VPD_PAGES},
  	{"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},
  	{"SUN", "Universal Xport", "*", BLIST_NO_ULD_ATTACH},
  	{"DELL", "Universal Xport", "*", BLIST_NO_ULD_ATTACH},
  	{"STK", "Universal Xport", "*", BLIST_NO_ULD_ATTACH},
  	{"NETAPP", "Universal Xport", "*", BLIST_NO_ULD_ATTACH},
  	{"LSI", "Universal Xport", "*", BLIST_NO_ULD_ATTACH},
  	{"ENGENIO", "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},
  	{"Tornado-", "F4", "*", BLIST_NOREPORTLUN},
  	{"TOSHIBA", "CDROM", NULL, BLIST_ISROM},
  	{"TOSHIBA", "CD-ROM", NULL, BLIST_ISROM},
  	{"Traxdata", "CDR4120", NULL, BLIST_NOLUN},	/* locks up */
  	{"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 },
  };
  
  static struct scsi_dev_info_list_table *scsi_devinfo_lookup_by_key(int key)
  {
  	struct scsi_dev_info_list_table *devinfo_table;
  	int found = 0;
  
  	list_for_each_entry(devinfo_table, &scsi_dev_info_list, node)
  		if (devinfo_table->key == key) {
  			found = 1;
  			break;
  		}
  	if (!found)
  		return ERR_PTR(-EINVAL);
  
  	return devinfo_table;
  }
  
  /*
   * 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);
  	/* This zero-pads the destination */
  	strncpy(to, from, to_length);
  	if (from_length < to_length && !compatible) {
  		/*
  		 * space pad the string if it is short.
  		 */
  		memset(&to[from_length], ' ', to_length - from_length);
  	}
  	if (from_length > to_length)
  		 printk(KERN_WARNING "%s: %s string '%s' is too long\n",
  			__func__, name, from);
  }
  
  /**
   * scsi_dev_info_list_add - add one dev_info list entry.
   * @compatible: if true, null terminate short strings.  Otherwise space pad.
   * @vendor:	vendor string
   * @model:	model (product) string
   * @strflags:	integer string
   * @flags:	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, blist_flags_t flags)
  {
  	return scsi_dev_info_list_add_keyed(compatible, vendor, model,
  					    strflags, flags,
  					    SCSI_DEVINFO_GLOBAL);
  }
  
  /**
   * scsi_dev_info_list_add_keyed - add one dev_info list entry.
   * @compatible: if true, null terminate short strings.  Otherwise space pad.
   * @vendor:	vendor string
   * @model:	model (product) string
   * @strflags:	integer string
   * @flags:	if strflags NULL, use this flag value
   * @key:	specify list to use
   *
   * Description:
   *	Create and add one dev_info entry for @vendor, @model,
   *	@strflags or @flag in list specified by @key. 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.
   **/
  int scsi_dev_info_list_add_keyed(int compatible, char *vendor, char *model,
  				 char *strflags, blist_flags_t flags, int key)
  {
  	struct scsi_dev_info_list *devinfo;
  	struct scsi_dev_info_list_table *devinfo_table =
  		scsi_devinfo_lookup_by_key(key);
  
  	if (IS_ERR(devinfo_table))
  		return PTR_ERR(devinfo_table);
  
  	devinfo = kmalloc(sizeof(*devinfo), GFP_KERNEL);
  	if (!devinfo) {
  		printk(KERN_ERR "%s: no memory\n", __func__);
  		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,
  			      &devinfo_table->scsi_dev_info_list);
  	else
  		list_add(&devinfo->dev_info_list,
  			 &devinfo_table->scsi_dev_info_list);
  
  	return 0;
  }
  EXPORT_SYMBOL(scsi_dev_info_list_add_keyed);
  
  /**
   * scsi_dev_info_list_find - find a matching dev_info list entry.
   * @vendor:	full vendor string
   * @model:	full model (product) string
   * @key:	specify list to use
   *
   * Description:
   *	Finds the first dev_info entry matching @vendor, @model
   *	in list specified by @key.
   *
   * Returns: pointer to matching entry, or ERR_PTR on failure.
   **/
  static struct scsi_dev_info_list *scsi_dev_info_list_find(const char *vendor,
  		const char *model, int key)
  {
  	struct scsi_dev_info_list *devinfo;
  	struct scsi_dev_info_list_table *devinfo_table =
  		scsi_devinfo_lookup_by_key(key);
  	size_t vmax, mmax, mlen;
  	const char *vskip, *mskip;
  
  	if (IS_ERR(devinfo_table))
  		return (struct scsi_dev_info_list *) devinfo_table;
  
  	/* Prepare for "compatible" matches */
  
  	/*
  	 * 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.
  	 */
  	vmax = sizeof(devinfo->vendor);
  	vskip = vendor;
  	while (vmax > 0 && *vskip == ' ') {
  		vmax--;
  		vskip++;
  	}
  	/* Also skip trailing spaces */
  	while (vmax > 0 && vskip[vmax - 1] == ' ')
  		--vmax;
  
  	mmax = sizeof(devinfo->model);
  	mskip = model;
  	while (mmax > 0 && *mskip == ' ') {
  		mmax--;
  		mskip++;
  	}
  	while (mmax > 0 && mskip[mmax - 1] == ' ')
  		--mmax;
  
  	list_for_each_entry(devinfo, &devinfo_table->scsi_dev_info_list,
  			    dev_info_list) {
  		if (devinfo->compatible) {
  			/*
  			 * vendor strings must be an exact match
  			 */
  			if (vmax != strnlen(devinfo->vendor,
  					    sizeof(devinfo->vendor)) ||
  			    memcmp(devinfo->vendor, vskip, vmax))
  				continue;
  
  			/*
  			 * @model specifies the full string, and
  			 * must be larger or equal to devinfo->model
  			 */
  			mlen = strnlen(devinfo->model, sizeof(devinfo->model));
  			if (mmax < mlen || memcmp(devinfo->model, mskip, mlen))
  				continue;
  			return devinfo;
  		} else {
  			if (!memcmp(devinfo->vendor, vendor,
  				    sizeof(devinfo->vendor)) &&
  			    !memcmp(devinfo->model, model,
  				    sizeof(devinfo->model)))
  				return devinfo;
  		}
  	}
  
  	return ERR_PTR(-ENOENT);
  }
  
  /**
   * scsi_dev_info_list_del_keyed - remove one dev_info list entry.
   * @vendor:	vendor string
   * @model:	model (product) string
   * @key:	specify list to use
   *
   * Description:
   *	Remove and destroy one dev_info entry for @vendor, @model
   *	in list specified by @key.
   *
   * Returns: 0 OK, -error on failure.
   **/
  int scsi_dev_info_list_del_keyed(char *vendor, char *model, int key)
  {
  	struct scsi_dev_info_list *found;
  
  	found = scsi_dev_info_list_find(vendor, model, key);
  	if (IS_ERR(found))
  		return PTR_ERR(found);
  
  	list_del(&found->dev_info_list);
  	kfree(found);
  	return 0;
  }
  EXPORT_SYMBOL(scsi_dev_info_list_del_keyed);
  
  /**
   * 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", __func__, 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.
   * @sdev:       &scsi_device to get flags for
   * @vendor:	vendor name
   * @model:	model name
   *
   * Description:
   *     Search the global scsi_dev_info_list (specified by list zero)
   *     for an entry matching @vendor and @model, if found, return the
   *     matching flags value, else return the host or global default
   *     settings.  Called during scan time.
   **/
  blist_flags_t scsi_get_device_flags(struct scsi_device *sdev,
  				    const unsigned char *vendor,
  				    const unsigned char *model)
  {
  	return scsi_get_device_flags_keyed(sdev, vendor, model,
  					   SCSI_DEVINFO_GLOBAL);
  }
  
  
  /**
   * scsi_get_device_flags_keyed - get device specific flags from the dynamic device list
   * @sdev:       &scsi_device to get flags for
   * @vendor:	vendor name
   * @model:	model name
   * @key:	list to look up
   *
   * Description:
   *     Search the scsi_dev_info_list specified by @key for an entry
   *     matching @vendor and @model, if found, return the matching
   *     flags value, else return the host or global default settings.
   *     Called during scan time.
   **/
  blist_flags_t scsi_get_device_flags_keyed(struct scsi_device *sdev,
  				const unsigned char *vendor,
  				const unsigned char *model,
  				int key)
  {
  	struct scsi_dev_info_list *devinfo;
  	int err;
  
  	devinfo = scsi_dev_info_list_find(vendor, model, key);
  	if (!IS_ERR(devinfo))
  		return devinfo->flags;
  
  	err = PTR_ERR(devinfo);
  	if (err != -ENOENT)
  		return err;
  
  	/* nothing found, return nothing */
  	if (key != SCSI_DEVINFO_GLOBAL)
  		return 0;
  
  	/* except for the global list, where we have an exception */
  	if (sdev->sdev_bflags)
  		return sdev->sdev_bflags;
  
  	return scsi_default_dev_flags;
  }
  EXPORT_SYMBOL(scsi_get_device_flags_keyed);
  
  #ifdef CONFIG_SCSI_PROC_FS
  struct double_list {
  	struct list_head *top;
  	struct list_head *bottom;
  };
  
  static int devinfo_seq_show(struct seq_file *m, void *v)
  {
  	struct double_list *dl = v;
  	struct scsi_dev_info_list_table *devinfo_table =
  		list_entry(dl->top, struct scsi_dev_info_list_table, node);
  	struct scsi_dev_info_list *devinfo =
  		list_entry(dl->bottom, struct scsi_dev_info_list,
  			   dev_info_list);
  
  	if (devinfo_table->scsi_dev_info_list.next == dl->bottom &&
  	    devinfo_table->name)
  		seq_printf(m, "[%s]:\n", devinfo_table->name);
  
  	seq_printf(m, "'%.8s' '%.16s' 0x%x\n",
  		   devinfo->vendor, devinfo->model, devinfo->flags);
  	return 0;
  }
  
  static void *devinfo_seq_start(struct seq_file *m, loff_t *ppos)
  {
  	struct double_list *dl = kmalloc(sizeof(*dl), GFP_KERNEL);
  	loff_t pos = *ppos;
  
  	if (!dl)
  		return NULL;
  
  	list_for_each(dl->top, &scsi_dev_info_list) {
  		struct scsi_dev_info_list_table *devinfo_table =
  			list_entry(dl->top, struct scsi_dev_info_list_table,
  				   node);
  		list_for_each(dl->bottom, &devinfo_table->scsi_dev_info_list)
  			if (pos-- == 0)
  				return dl;
  	}
  
  	kfree(dl);
  	return NULL;
  }
  
  static void *devinfo_seq_next(struct seq_file *m, void *v, loff_t *ppos)
  {
  	struct double_list *dl = v;
  	struct scsi_dev_info_list_table *devinfo_table =
  		list_entry(dl->top, struct scsi_dev_info_list_table, node);
  
  	++*ppos;
  	dl->bottom = dl->bottom->next;
  	while (&devinfo_table->scsi_dev_info_list == dl->bottom) {
  		dl->top = dl->top->next;
  		if (dl->top == &scsi_dev_info_list) {
  			kfree(dl);
  			return NULL;
  		}
  		devinfo_table = list_entry(dl->top,
  					   struct scsi_dev_info_list_table,
  					   node);
  		dl->bottom = devinfo_table->scsi_dev_info_list.next;
  	}
  
  	return dl;
  }
  
  static void devinfo_seq_stop(struct seq_file *m, void *v)
  {
  	kfree(v);
  }
  
  static const struct seq_operations scsi_devinfo_seq_ops = {
  	.start	= devinfo_seq_start,
  	.next	= devinfo_seq_next,
  	.stop	= devinfo_seq_stop,
  	.show	= devinfo_seq_show,
  };
  
  static int proc_scsi_devinfo_open(struct inode *inode, struct file *file)
  {
  	return seq_open(file, &scsi_devinfo_seq_ops);
  }
  
  /*
   * proc_scsi_dev_info_write - allow additions to scsi_dev_info_list via /proc.
   *
   * Description: Adds a black/white list entry for vendor and model with an
   * integer value of flag to the scsi device info list.
   * To use, echo "vendor:model:flag" > /proc/scsi/device_info
   */
  static ssize_t proc_scsi_devinfo_write(struct file *file,
  				       const char __user *buf,
  				       size_t length, loff_t *ppos)
  {
  	char *buffer;
  	ssize_t 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;
  }
  
  static const struct file_operations scsi_devinfo_proc_fops = {
  	.owner		= THIS_MODULE,
  	.open		= proc_scsi_devinfo_open,
  	.read		= seq_read,
  	.write		= proc_scsi_devinfo_write,
  	.llseek		= seq_lseek,
  	.release	= seq_release,
  };
  #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_exit_devinfo - remove /proc/scsi/device_info & the scsi_dev_info_list
   **/
  void scsi_exit_devinfo(void)
  {
  #ifdef CONFIG_SCSI_PROC_FS
  	remove_proc_entry("scsi/device_info", NULL);
  #endif
  
  	scsi_dev_info_remove_list(SCSI_DEVINFO_GLOBAL);
  }
  
  /**
   * scsi_dev_info_add_list - add a new devinfo list
   * @key:	key of the list to add
   * @name:	Name of the list to add (for /proc/scsi/device_info)
   *
   * Adds the requested list, returns zero on success, -EEXIST if the
   * key is already registered to a list, or other error on failure.
   */
  int scsi_dev_info_add_list(int key, const char *name)
  {
  	struct scsi_dev_info_list_table *devinfo_table =
  		scsi_devinfo_lookup_by_key(key);
  
  	if (!IS_ERR(devinfo_table))
  		/* list already exists */
  		return -EEXIST;
  
  	devinfo_table = kmalloc(sizeof(*devinfo_table), GFP_KERNEL);
  
  	if (!devinfo_table)
  		return -ENOMEM;
  
  	INIT_LIST_HEAD(&devinfo_table->node);
  	INIT_LIST_HEAD(&devinfo_table->scsi_dev_info_list);
  	devinfo_table->name = name;
  	devinfo_table->key = key;
  	list_add_tail(&devinfo_table->node, &scsi_dev_info_list);
  
  	return 0;
  }
  EXPORT_SYMBOL(scsi_dev_info_add_list);
  
  /**
   * scsi_dev_info_remove_list - destroy an added devinfo list
   * @key: key of the list to destroy
   *
   * Iterates over the entire list first, freeing all the values, then
   * frees the list itself.  Returns 0 on success or -EINVAL if the key
   * can't be found.
   */
  int scsi_dev_info_remove_list(int key)
  {
  	struct list_head *lh, *lh_next;
  	struct scsi_dev_info_list_table *devinfo_table =
  		scsi_devinfo_lookup_by_key(key);
  
  	if (IS_ERR(devinfo_table))
  		/* no such list */
  		return -EINVAL;
  
  	/* remove from the master list */
  	list_del(&devinfo_table->node);
  
  	list_for_each_safe(lh, lh_next, &devinfo_table->scsi_dev_info_list) {
  		struct scsi_dev_info_list *devinfo;
  
  		devinfo = list_entry(lh, struct scsi_dev_info_list,
  				     dev_info_list);
  		kfree(devinfo);
  	}
  	kfree(devinfo_table);
  
  	return 0;
  }
  EXPORT_SYMBOL(scsi_dev_info_remove_list);
  
  /**
   * scsi_init_devinfo - set up the dynamic device list.
   *
   * Description:
   *	Add command line entries from scsi_dev_flags, 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_add_list(SCSI_DEVINFO_GLOBAL, NULL);
  	if (error)
  		return error;
  
  	error = scsi_dev_info_list_add_str(scsi_dev_flags);
  	if (error)
  		goto out;
  
  	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 = proc_create("scsi/device_info", 0, NULL, &scsi_devinfo_proc_fops);
  	if (!p) {
  		error = -ENOMEM;
  		goto out;
  	}
  #endif /* CONFIG_SCSI_PROC_FS */
  
   out:
  	if (error)
  		scsi_exit_devinfo();
  	return error;
  }
  