drivers/scsi/scsi_devinfo.c

   1
   2 #include <linux/blkdev.h>
   3 #include <linux/init.h>
   4 #include <linux/kernel.h>
   5 #include <linux/module.h>
   6 #include <linux/moduleparam.h>
   7 #include <linux/proc_fs.h>
   8 #include <linux/seq_file.h>
   9
  10 #include <scsi/scsi_device.h>
  11 #include <scsi/scsi_devinfo.h>
  12
  13 #include "scsi_priv.h"
  14
  15
  16 /*
  17  * scsi_dev_info_list: structure to hold black/white listed devices.
  18  */
  19 struct scsi_dev_info_list {
  20         struct list_head dev_info_list;
  21         char vendor[8];
  22         char model[16];
  23         unsigned flags;
  24         unsigned compatible; /* for use with scsi_static_device_list entries */
  25 };
  26
  27
  28 static const char spaces[] = "                "; /* 16 of them */
  29 static unsigned scsi_default_dev_flags;
  30 static LIST_HEAD(scsi_dev_info_list);
  31 static __initdata char scsi_dev_flags[256];
  32
  33 /*
  34  * scsi_static_device_list: deprecated list of devices that require
  35  * settings that differ from the default, includes black-listed (broken)
  36  * devices. The entries here are added to the tail of scsi_dev_info_list
  37  * via scsi_dev_info_list_init.
  38  *
  39  * Do not add to this list, use the command line or proc interface to add
  40  * to the scsi_dev_info_list. This table will eventually go away.
  41  */
  42 static struct {
  43         char *vendor;
  44         char *model;
  45         char *revision; /* revision known to be bad, unused */
  46         unsigned flags;
  47 } scsi_static_device_list[] __initdata = {
  48         /*
  49          * The following devices are known not to tolerate a lun != 0 scan
  50          * for one reason or another. Some will respond to all luns,
  51          * others will lock up.
  52          */
  53         {"Aashima", "IMAGERY 2400SP", "1.03", BLIST_NOLUN},     /* locks up */
  54         {"CHINON", "CD-ROM CDS-431", "H42", BLIST_NOLUN},       /* locks up */
  55         {"CHINON", "CD-ROM CDS-535", "Q14", BLIST_NOLUN},       /* locks up */
  56         {"DENON", "DRD-25X", "V", BLIST_NOLUN},                 /* locks up */
  57         {"HITACHI", "DK312C", "CM81", BLIST_NOLUN},     /* responds to all lun */
  58         {"HITACHI", "DK314C", "CR21", BLIST_NOLUN},     /* responds to all lun */
  59         {"IMS", "CDD521/10", "2.06", BLIST_NOLUN},      /* locks up */
  60         {"MAXTOR", "XT-3280", "PR02", BLIST_NOLUN},     /* locks up */
  61         {"MAXTOR", "XT-4380S", "B3C", BLIST_NOLUN},     /* locks up */
  62         {"MAXTOR", "MXT-1240S", "I1.2", BLIST_NOLUN},   /* locks up */
  63         {"MAXTOR", "XT-4170S", "B5A", BLIST_NOLUN},     /* locks up */
  64         {"MAXTOR", "XT-8760S", "B7B", BLIST_NOLUN},     /* locks up */
  65         {"MEDIAVIS", "RENO CD-ROMX2A", "2.03", BLIST_NOLUN},    /* responds to all lun */
  66         {"MICROTEK", "ScanMakerIII", "2.30", BLIST_NOLUN},      /* responds to all lun */
  67         {"NEC", "CD-ROM DRIVE:841", "1.0", BLIST_NOLUN},/* locks up */
  68         {"PHILIPS", "PCA80SC", "V4-2", BLIST_NOLUN},    /* responds to all lun */
  69         {"RODIME", "RO3000S", "2.33", BLIST_NOLUN},     /* locks up */
  70         {"SUN", "SENA", NULL, BLIST_NOLUN},             /* responds to all luns */
  71         /*
  72          * The following causes a failed REQUEST SENSE on lun 1 for
  73          * aha152x controller, which causes SCSI code to reset bus.
  74          */
  75         {"SANYO", "CRD-250S", "1.20", BLIST_NOLUN},
  76         /*
  77          * The following causes a failed REQUEST SENSE on lun 1 for
  78          * aha152x controller, which causes SCSI code to reset bus.
  79          */
  80         {"SEAGATE", "ST157N", "\004|j", BLIST_NOLUN},
  81         {"SEAGATE", "ST296", "921", BLIST_NOLUN},       /* responds to all lun */
  82         {"SEAGATE", "ST1581", "6538", BLIST_NOLUN},     /* responds to all lun */
  83         {"SONY", "CD-ROM CDU-541", "4.3d", BLIST_NOLUN},
  84         {"SONY", "CD-ROM CDU-55S", "1.0i", BLIST_NOLUN},
  85         {"SONY", "CD-ROM CDU-561", "1.7x", BLIST_NOLUN},
  86         {"SONY", "CD-ROM CDU-8012", NULL, BLIST_NOLUN},
  87         {"SONY", "SDT-5000", "3.17", BLIST_SELECT_NO_ATN},
  88         {"TANDBERG", "TDC 3600", "U07", BLIST_NOLUN},   /* locks up */
  89         {"TEAC", "CD-R55S", "1.0H", BLIST_NOLUN},       /* locks up */
  90         /*
  91          * The following causes a failed REQUEST SENSE on lun 1 for
  92          * seagate controller, which causes SCSI code to reset bus.
  93          */
  94         {"TEAC", "CD-ROM", "1.06", BLIST_NOLUN},
  95         {"TEAC", "MT-2ST/45S2-27", "RV M", BLIST_NOLUN},        /* responds to all lun */
  96         /*
  97          * The following causes a failed REQUEST SENSE on lun 1 for
  98          * seagate controller, which causes SCSI code to reset bus.
  99          */
 100         {"HP", "C1750A", "3226", BLIST_NOLUN},          /* scanjet iic */
 101         {"HP", "C1790A", "", BLIST_NOLUN},              /* scanjet iip */
 102         {"HP", "C2500A", "", BLIST_NOLUN},              /* scanjet iicx */
 103         {"MEDIAVIS", "CDR-H93MV", "1.31", BLIST_NOLUN}, /* locks up */
 104         {"MICROTEK", "ScanMaker II", "5.61", BLIST_NOLUN},      /* responds to all lun */
 105         {"MITSUMI", "CD-R CR-2201CS", "6119", BLIST_NOLUN},     /* locks up */
 106         {"NEC", "D3856", "0009", BLIST_NOLUN},
 107         {"QUANTUM", "LPS525S", "3110", BLIST_NOLUN},    /* locks up */
 108         {"QUANTUM", "PD1225S", "3110", BLIST_NOLUN},    /* locks up */
 109         {"QUANTUM", "FIREBALL ST4.3S", "0F0C", BLIST_NOLUN},    /* locks up */
 110         {"RELISYS", "Scorpio", NULL, BLIST_NOLUN},      /* responds to all lun */
 111         {"SANKYO", "CP525", "6.64", BLIST_NOLUN},       /* causes failed REQ SENSE, extra reset */
 112         {"TEXEL", "CD-ROM", "1.06", BLIST_NOLUN},
 113         {"YAMAHA", "CDR100", "1.00", BLIST_NOLUN},      /* locks up */
 114         {"YAMAHA", "CDR102", "1.00", BLIST_NOLUN},      /* locks up */
 115         {"YAMAHA", "CRW8424S", "1.0", BLIST_NOLUN},     /* locks up */
 116         {"YAMAHA", "CRW6416S", "1.0c", BLIST_NOLUN},    /* locks up */
 117
 118         /*
 119          * Other types of devices that have special flags.
 120          * Note that all USB devices should have the BLIST_INQUIRY_36 flag.
 121          */
 122         {"3PARdata", "VV", NULL, BLIST_REPORTLUN2},
 123         {"ADAPTEC", "AACRAID", NULL, BLIST_FORCELUN},
 124         {"ADAPTEC", "Adaptec 5400S", NULL, BLIST_FORCELUN},
 125         {"AFT PRO", "-IX CF", "0.0>", BLIST_FORCELUN},
 126         {"BELKIN", "USB 2 HS-CF", "1.95",  BLIST_FORCELUN | BLIST_INQUIRY_36},
 127         {"CANON", "IPUBJD", NULL, BLIST_SPARSELUN},
 128         {"CBOX3", "USB Storage-SMC", "300A", BLIST_FORCELUN | BLIST_INQUIRY_36},
 129         {"CMD", "CRA-7280", NULL, BLIST_SPARSELUN},     /* CMD RAID Controller */
 130         {"CNSI", "G7324", NULL, BLIST_SPARSELUN},       /* Chaparral G7324 RAID */
 131         {"CNSi", "G8324", NULL, BLIST_SPARSELUN},       /* Chaparral G8324 RAID */
 132         {"COMPAQ", "LOGICAL VOLUME", NULL, BLIST_FORCELUN},
 133         {"COMPAQ", "CR3500", NULL, BLIST_FORCELUN},
 134         {"COMPAQ", "MSA1000", NULL, BLIST_SPARSELUN | BLIST_NOSTARTONADD},
 135         {"COMPAQ", "MSA1000 VOLUME", NULL, BLIST_SPARSELUN | BLIST_NOSTARTONADD},
 136         {"COMPAQ", "HSV110", NULL, BLIST_REPORTLUN2 | BLIST_NOSTARTONADD},
 137         {"DDN", "SAN DataDirector", "*", BLIST_SPARSELUN},
 138         {"DEC", "HSG80", NULL, BLIST_SPARSELUN | BLIST_NOSTARTONADD},
 139         {"DELL", "PV660F", NULL, BLIST_SPARSELUN},
 140         {"DELL", "PV660F   PSEUDO", NULL, BLIST_SPARSELUN},
 141         {"DELL", "PSEUDO DEVICE .", NULL, BLIST_SPARSELUN},     /* Dell PV 530F */
 142         {"DELL", "PV530F", NULL, BLIST_SPARSELUN},
 143         {"DELL", "PERCRAID", NULL, BLIST_FORCELUN},
 144         {"DGC", "RAID", NULL, BLIST_SPARSELUN}, /* Dell PV 650F, storage on LUN 0 */
 145         {"DGC", "DISK", NULL, BLIST_SPARSELUN}, /* Dell PV 650F, no storage on LUN 0 */
 146         {"EMC", "SYMMETRIX", NULL, BLIST_SPARSELUN | BLIST_LARGELUN | BLIST_FORCELUN},
 147         {"EMULEX", "MD21/S2     ESDI", NULL, BLIST_SINGLELUN},
 148         {"FSC", "CentricStor", "*", BLIST_SPARSELUN | BLIST_LARGELUN},
 149         {"Generic", "USB SD Reader", "1.00", BLIST_FORCELUN | BLIST_INQUIRY_36},
 150         {"Generic", "USB Storage-SMC", "0180", BLIST_FORCELUN | BLIST_INQUIRY_36},
 151         {"Generic", "USB Storage-SMC", "0207", BLIST_FORCELUN | BLIST_INQUIRY_36},
 152         {"HITACHI", "DF400", "*", BLIST_SPARSELUN},
 153         {"HITACHI", "DF500", "*", BLIST_SPARSELUN},
 154         {"HITACHI", "DF600", "*", BLIST_SPARSELUN},
 155         {"HP", "A6189A", NULL, BLIST_SPARSELUN | BLIST_LARGELUN},       /* HP VA7400 */
 156         {"HP", "OPEN-", "*", BLIST_SPARSELUN | BLIST_LARGELUN}, /* HP XP Arrays */
 157         {"HP", "NetRAID-4M", NULL, BLIST_FORCELUN},
 158         {"HP", "HSV100", NULL, BLIST_REPORTLUN2 | BLIST_NOSTARTONADD},
 159         {"HP", "C1557A", NULL, BLIST_FORCELUN},
 160         {"HP", "C3323-300", "4269", BLIST_NOTQ},
 161         {"IBM", "AuSaV1S2", NULL, BLIST_FORCELUN},
 162         {"IBM", "ProFibre 4000R", "*", BLIST_SPARSELUN | BLIST_LARGELUN},
 163         {"iomega", "jaz 1GB", "J.86", BLIST_NOTQ | BLIST_NOLUN},
 164         {"IOMEGA", "Io20S         *F", NULL, BLIST_KEY},
 165         {"INSITE", "Floptical   F*8I", NULL, BLIST_KEY},
 166         {"INSITE", "I325VM", NULL, BLIST_KEY},
 167         {"iRiver", "iFP Mass Driver", NULL, BLIST_NOT_LOCKABLE | BLIST_INQUIRY_36},
 168         {"LASOUND", "CDX7405", "3.10", BLIST_MAX5LUN | BLIST_SINGLELUN},
 169         {"MATSHITA", "PD-1", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
 170         {"MATSHITA", "DMC-LC5", NULL, BLIST_NOT_LOCKABLE | BLIST_INQUIRY_36},
 171         {"MATSHITA", "DMC-LC40", NULL, BLIST_NOT_LOCKABLE | BLIST_INQUIRY_36},
 172         {"Medion", "Flash XL  MMC/SD", "2.6D", BLIST_FORCELUN},
 173         {"MegaRAID", "LD", NULL, BLIST_FORCELUN},
 174         {"MICROP", "4110", NULL, BLIST_NOTQ},
 175         {"MYLEX", "DACARMRB", "*", BLIST_REPORTLUN2},
 176         {"nCipher", "Fastness Crypto", NULL, BLIST_FORCELUN},
 177         {"NAKAMICH", "MJ-4.8S", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
 178         {"NAKAMICH", "MJ-5.16S", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
 179         {"NEC", "PD-1 ODX654P", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
 180         {"NRC", "MBR-7", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
 181         {"NRC", "MBR-7.4", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
 182         {"PIONEER", "CD-ROM DRM-600", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
 183         {"PIONEER", "CD-ROM DRM-602X", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
 184         {"PIONEER", "CD-ROM DRM-604X", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
 185         {"REGAL", "CDC-4X", NULL, BLIST_MAX5LUN | BLIST_SINGLELUN},
 186         {"SanDisk", "ImageMate CF-SD1", NULL, BLIST_FORCELUN},
 187         {"SEAGATE", "ST34555N", "0930", BLIST_NOTQ},    /* Chokes on tagged INQUIRY */
 188         {"SEAGATE", "ST3390N", "9546", BLIST_NOTQ},
 189         {"SGI", "RAID3", "*", BLIST_SPARSELUN},
 190         {"SGI", "RAID5", "*", BLIST_SPARSELUN},
 191         {"SGI", "TP9100", "*", BLIST_REPORTLUN2},
 192         {"SGI", "Universal Xport", "*", BLIST_NO_ULD_ATTACH},
 193         {"SMSC", "USB 2 HS-CF", NULL, BLIST_SPARSELUN | BLIST_INQUIRY_36},
 194         {"SONY", "CD-ROM CDU-8001", NULL, BLIST_BORKEN},
 195         {"SONY", "TSL", NULL, BLIST_FORCELUN},          /* DDS3 & DDS4 autoloaders */
 196         {"SUN", "T300", "*", BLIST_SPARSELUN},
 197         {"SUN", "T4", "*", BLIST_SPARSELUN},
 198         {"TEXEL", "CD-ROM", "1.06", BLIST_BORKEN},
 199         {"TOSHIBA", "CDROM", NULL, BLIST_ISROM},
 200         {"TOSHIBA", "CD-ROM", NULL, BLIST_ISROM},
 201         {"USB2.0", "SMARTMEDIA/XD", NULL, BLIST_FORCELUN | BLIST_INQUIRY_36},
 202         {"WangDAT", "Model 2600", "01.7", BLIST_SELECT_NO_ATN},
 203         {"WangDAT", "Model 3200", "02.2", BLIST_SELECT_NO_ATN},
 204         {"WangDAT", "Model 1300", "02.4", BLIST_SELECT_NO_ATN},
 205         {"XYRATEX", "RS", "*", BLIST_SPARSELUN | BLIST_LARGELUN},
 206         {"Zzyzx", "RocketStor 500S", NULL, BLIST_SPARSELUN},
 207         {"Zzyzx", "RocketStor 2000", NULL, BLIST_SPARSELUN},
 208         { NULL, NULL, NULL, 0 },
 209 };
 210
 211 /*
 212  * scsi_strcpy_devinfo: called from scsi_dev_info_list_add to copy into
 213  * devinfo vendor and model strings.
 214  */
 215 static void scsi_strcpy_devinfo(char *name, char *to, size_t to_length,
 216                                 char *from, int compatible)
 217 {
 218         size_t from_length;
 219
 220         from_length = strlen(from);
 221         strncpy(to, from, min(to_length, from_length));
 222         if (from_length < to_length) {
 223                 if (compatible) {
 224                         /*
 225                          * NUL terminate the string if it is short.
 226                          */
 227                         to[from_length] = '\0';
 228                 } else {
 229                         /*
 230                          * space pad the string if it is short.
 231                          */
 232                         strncpy(&to[from_length], spaces,
 233                                 to_length - from_length);
 234                 }
 235         }
 236         if (from_length > to_length)
 237                  printk(KERN_WARNING "%s: %s string '%s' is too long\n",
 238                         __FUNCTION__, name, from);
 239 }
 240
 241 /**
 242  * scsi_dev_info_list_add: add one dev_info list entry.
 243  * @vendor:     vendor string
 244  * @model:      model (product) string
 245  * @strflags:   integer string
 246  * @flag:       if strflags NULL, use this flag value
 247  *
 248  * Description:
 249  *      Create and add one dev_info entry for @vendor, @model, @strflags or
 250  *      @flag. If @compatible, add to the tail of the list, do not space
 251  *      pad, and set devinfo->compatible. The scsi_static_device_list entries
 252  *      are added with @compatible 1 and @clfags NULL.
 253  *
 254  * Returns: 0 OK, -error on failure.
 255  **/
 256 static int scsi_dev_info_list_add(int compatible, char *vendor, char *model,
 257                             char *strflags, int flags)
 258 {
 259         struct scsi_dev_info_list *devinfo;
 260
 261         devinfo = kmalloc(sizeof(*devinfo), GFP_KERNEL);
 262         if (!devinfo) {
 263                 printk(KERN_ERR "%s: no memory\n", __FUNCTION__);
 264                 return -ENOMEM;
 265         }
 266
 267         scsi_strcpy_devinfo("vendor", devinfo->vendor, sizeof(devinfo->vendor),
 268                             vendor, compatible);
 269         scsi_strcpy_devinfo("model", devinfo->model, sizeof(devinfo->model),
 270                             model, compatible);
 271
 272         if (strflags)
 273                 devinfo->flags = simple_strtoul(strflags, NULL, 0);
 274         else
 275                 devinfo->flags = flags;
 276
 277         devinfo->compatible = compatible;
 278
 279         if (compatible)
 280                 list_add_tail(&devinfo->dev_info_list, &scsi_dev_info_list);
 281         else
 282                 list_add(&devinfo->dev_info_list, &scsi_dev_info_list);
 283
 284         return 0;
 285 }
 286
 287 /**
 288  * scsi_dev_info_list_add_str: parse dev_list and add to the
 289  * scsi_dev_info_list.
 290  * @dev_list:   string of device flags to add
 291  *
 292  * Description:
 293  *      Parse dev_list, and add entries to the scsi_dev_info_list.
 294  *      dev_list is of the form "vendor:product:flag,vendor:product:flag".
 295  *      dev_list is modified via strsep. Can be called for command line
 296  *      addition, for proc or mabye a sysfs interface.
 297  *
 298  * Returns: 0 if OK, -error on failure.
 299  **/
 300 static int scsi_dev_info_list_add_str(char *dev_list)
 301 {
 302         char *vendor, *model, *strflags, *next;
 303         char *next_check;
 304         int res = 0;
 305
 306         next = dev_list;
 307         if (next && next[0] == '"') {
 308                 /*
 309                  * Ignore both the leading and trailing quote.
 310                  */
 311                 next++;
 312                 next_check = ",\"";
 313         } else {
 314                 next_check = ",";
 315         }
 316
 317         /*
 318          * For the leading and trailing '"' case, the for loop comes
 319          * through the last time with vendor[0] == '\0'.
 320          */
 321         for (vendor = strsep(&next, ":"); vendor && (vendor[0] != '\0')
 322              && (res == 0); vendor = strsep(&next, ":")) {
 323                 strflags = NULL;
 324                 model = strsep(&next, ":");
 325                 if (model)
 326                         strflags = strsep(&next, next_check);
 327                 if (!model || !strflags) {
 328                         printk(KERN_ERR "%s: bad dev info string '%s' '%s'"
 329                                " '%s'\n", __FUNCTION__, vendor, model,
 330                                strflags);
 331                         res = -EINVAL;
 332                 } else
 333                         res = scsi_dev_info_list_add(0 /* compatible */, vendor,
 334                                                      model, strflags, 0);
 335         }
 336         return res;
 337 }
 338
 339 /**
 340  * get_device_flags - get device specific flags from the dynamic device
 341  * list. Called during scan time.
 342  * @vendor:     vendor name
 343  * @model:      model name
 344  *
 345  * Description:
 346  *     Search the scsi_dev_info_list for an entry matching @vendor and
 347  *     @model, if found, return the matching flags value, else return
 348  *     the host or global default settings.
 349  **/
 350 int scsi_get_device_flags(struct scsi_device *sdev, unsigned char *vendor,
 351                           unsigned char *model)
 352 {
 353         struct scsi_dev_info_list *devinfo;
 354         unsigned int bflags;
 355
 356         bflags = sdev->sdev_bflags;
 357         if (!bflags)
 358                 bflags = scsi_default_dev_flags;
 359
 360         list_for_each_entry(devinfo, &scsi_dev_info_list, dev_info_list) {
 361                 if (devinfo->compatible) {
 362                         /*
 363                          * Behave like the older version of get_device_flags.
 364                          */
 365                         size_t max;
 366                         /*
 367                          * XXX why skip leading spaces? If an odd INQUIRY
 368                          * value, that should have been part of the
 369                          * scsi_static_device_list[] entry, such as "  FOO"
 370                          * rather than "FOO". Since this code is already
 371                          * here, and we don't know what device it is
 372                          * trying to work with, leave it as-is.
 373                          */
 374                         max = 8;        /* max length of vendor */
 375                         while ((max > 0) && *vendor == ' ') {
 376                                 max--;
 377                                 vendor++;
 378                         }
 379                         /*
 380                          * XXX removing the following strlen() would be
 381                          * good, using it means that for a an entry not in
 382                          * the list, we scan every byte of every vendor
 383                          * listed in scsi_static_device_list[], and never match
 384                          * a single one (and still have to compare at
 385                          * least the first byte of each vendor).
 386                          */
 387                         if (memcmp(devinfo->vendor, vendor,
 388                                     min(max, strlen(devinfo->vendor))))
 389                                 continue;
 390                         /*
 391                          * Skip spaces again.
 392                          */
 393                         max = 16;       /* max length of model */
 394                         while ((max > 0) && *model == ' ') {
 395                                 max--;
 396                                 model++;
 397                         }
 398                         if (memcmp(devinfo->model, model,
 399                                    min(max, strlen(devinfo->model))))
 400                                 continue;
 401                         return devinfo->flags;
 402                 } else {
 403                         if (!memcmp(devinfo->vendor, vendor,
 404                                      sizeof(devinfo->vendor)) &&
 405                              !memcmp(devinfo->model, model,
 406                                       sizeof(devinfo->model)))
 407                                 return devinfo->flags;
 408                 }
 409         }
 410         return bflags;
 411 }
 412
 413 #ifdef CONFIG_SCSI_PROC_FS
 414 /*
 415  * proc_scsi_dev_info_read: dump the scsi_dev_info_list via
 416  * /proc/scsi/device_info
 417  */
 418 static int proc_scsi_devinfo_read(char *buffer, char **start,
 419                                   off_t offset, int length)
 420 {
 421         struct scsi_dev_info_list *devinfo;
 422         int size, len = 0;
 423         off_t begin = 0;
 424         off_t pos = 0;
 425
 426         list_for_each_entry(devinfo, &scsi_dev_info_list, dev_info_list) {
 427                 size = sprintf(buffer + len, "'%.8s' '%.16s' 0x%x\n",
 428                         devinfo->vendor, devinfo->model, devinfo->flags);
 429                 len += size;
 430                 pos = begin + len;
 431                 if (pos < offset) {
 432                         len = 0;
 433                         begin = pos;
 434                 }
 435                 if (pos > offset + length)
 436                         goto stop_output;
 437         }
 438
 439 stop_output:
 440         *start = buffer + (offset - begin);     /* Start of wanted data */
 441         len -= (offset - begin);        /* Start slop */
 442         if (len > length)
 443                 len = length;   /* Ending slop */
 444         return (len);
 445 }
 446
 447 /*
 448  * proc_scsi_dev_info_write: allow additions to the scsi_dev_info_list via
 449  * /proc.
 450  *
 451  * Use: echo "vendor:model:flag" > /proc/scsi/device_info
 452  *
 453  * To add a black/white list entry for vendor and model with an integer
 454  * value of flag to the scsi device info list.
 455  */
 456 static int proc_scsi_devinfo_write(struct file *file, const char __user *buf,
 457                                    unsigned long length, void *data)
 458 {
 459         char *buffer;
 460         int err = length;
 461
 462         if (!buf || length>PAGE_SIZE)
 463                 return -EINVAL;
 464         if (!(buffer = (char *) __get_free_page(GFP_KERNEL)))
 465                 return -ENOMEM;
 466         if (copy_from_user(buffer, buf, length)) {
 467                 err =-EFAULT;
 468                 goto out;
 469         }
 470
 471         if (length < PAGE_SIZE)
 472                 buffer[length] = '\0';
 473         else if (buffer[PAGE_SIZE-1]) {
 474                 err = -EINVAL;
 475                 goto out;
 476         }
 477
 478         scsi_dev_info_list_add_str(buffer);
 479
 480 out:
 481         free_page((unsigned long)buffer);
 482         return err;
 483 }
 484 #endif /* CONFIG_SCSI_PROC_FS */
 485
 486 module_param_string(dev_flags, scsi_dev_flags, sizeof(scsi_dev_flags), 0);
 487 MODULE_PARM_DESC(dev_flags,
 488          "Given scsi_dev_flags=vendor:model:flags[,v:m:f] add black/white"
 489          " list entries for vendor and model with an integer value of flags"
 490          " to the scsi device info list");
 491
 492 module_param_named(default_dev_flags, scsi_default_dev_flags, int, S_IRUGO|S_IWUSR);
 493 MODULE_PARM_DESC(default_dev_flags,
 494                  "scsi default device flag integer value");
 495
 496 /**
 497  * scsi_dev_info_list_delete: called from scsi.c:exit_scsi to remove
 498  *      the scsi_dev_info_list.
 499  **/
 500 void scsi_exit_devinfo(void)
 501 {
 502         struct list_head *lh, *lh_next;
 503         struct scsi_dev_info_list *devinfo;
 504
 505 #ifdef CONFIG_SCSI_PROC_FS
 506         remove_proc_entry("scsi/device_info", NULL);
 507 #endif
 508
 509         list_for_each_safe(lh, lh_next, &scsi_dev_info_list) {
 510                 devinfo = list_entry(lh, struct scsi_dev_info_list,
 511                                      dev_info_list);
 512                 kfree(devinfo);
 513         }
 514 }
 515
 516 /**
 517  * scsi_dev_list_init: set up the dynamic device list.
 518  * @dev_list:   string of device flags to add
 519  *
 520  * Description:
 521  *      Add command line @dev_list entries, then add
 522  *      scsi_static_device_list entries to the scsi device info list.
 523  **/
 524 int __init scsi_init_devinfo(void)
 525 {
 526 #ifdef CONFIG_SCSI_PROC_FS
 527         struct proc_dir_entry *p;
 528 #endif
 529         int error, i;
 530
 531         error = scsi_dev_info_list_add_str(scsi_dev_flags);
 532         if (error)
 533                 return error;
 534
 535         for (i = 0; scsi_static_device_list[i].vendor; i++) {
 536                 error = scsi_dev_info_list_add(1 /* compatibile */,
 537                                 scsi_static_device_list[i].vendor,
 538                                 scsi_static_device_list[i].model,
 539                                 NULL,
 540                                 scsi_static_device_list[i].flags);
 541                 if (error)
 542                         goto out;
 543         }
 544
 545 #ifdef CONFIG_SCSI_PROC_FS
 546         p = create_proc_entry("scsi/device_info", 0, NULL);
 547         if (!p) {
 548                 error = -ENOMEM;
 549                 goto out;
 550         }
 551
 552         p->owner = THIS_MODULE;
 553         p->get_info = proc_scsi_devinfo_read;
 554         p->write_proc = proc_scsi_devinfo_write;
 555 #endif /* CONFIG_SCSI_PROC_FS */
 556
 557  out:
 558         if (error)
 559                 scsi_exit_devinfo();
 560         return error;
 561 }