ide: make drive->id an union (take 2)

Make drive->id an unnamed union so id can be accessed either by using
'u16 *id' or 'struct hd_driveid *driveid'.  Then convert all existing
drive->id users accordingly (using 'u16 *id' when possible).

This is an intermediate step to make ide 'struct hd_driveid'-free.

While at it:

- Add missing KERN_CONTs in it821x.c.

- Use ATA_ID_WORDS and ATA_ID_*_LEN defines.

- Remove unnecessary checks for drive->id.

- s/drive_table/table/ in ide_in_drive_list().

- Cleanup ide_config_drive_speed() a bit.

- s/drive1/dev1/ & s/drive0/dev0/ in ide_undecoded_slave().

v2:
Fix typo in drivers/ide/ppc/pmac.c. (From Stephen Rothwell)

There should be no functional changes caused by this patch.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

28 files changed, 312 insertions, 280 deletions

diff --git a/drivers/ide/arm/icside.c b/drivers/ide/arm/icside.c
index df4af4083954..ca9e8ea32ee2 100644
--- a/drivers/ide/arm/icside.c
+++ b/drivers/ide/arm/icside.c
@@ -265,8 +265,8 @@ static void icside_set_dma_mode(ide_drive_t *drive, const u8 xfer_mode)
          * If we're going to be doing MW_DMA_1 or MW_DMA_2, we should
          * take care to note the values in the ID...
          */
-        if (use_dma_info && drive->id->eide_dma_time > cycle_time)
-                cycle_time = drive->id->eide_dma_time;
+        if (use_dma_info && drive->id[ATA_ID_EIDE_DMA_TIME] > cycle_time)
+                cycle_time = drive->id[ATA_ID_EIDE_DMA_TIME];
 
         drive->drive_data = cycle_time;
 
diff --git a/drivers/ide/arm/palm_bk3710.c b/drivers/ide/arm/palm_bk3710.c
index 4fd91dcf1dc2..6cea984776fd 100644
--- a/drivers/ide/arm/palm_bk3710.c
+++ b/drivers/ide/arm/palm_bk3710.c
@@ -213,7 +213,8 @@ static void palm_bk3710_set_dma_mode(ide_drive_t *drive, u8 xferspeed)
                 palm_bk3710_setudmamode(base, is_slave,
                                         xferspeed - XFER_UDMA_0);
         } else {
-                palm_bk3710_setdmamode(base, is_slave, drive->id->eide_dma_min,
+                palm_bk3710_setdmamode(base, is_slave,
+                                       drive->id[ATA_ID_EIDE_DMA_MIN],
                                        xferspeed);
         }
 }
diff --git a/drivers/ide/ide-acpi.c b/drivers/ide/ide-acpi.c
index 6f704628c27d..2427c380b3dc 100644
--- a/drivers/ide/ide-acpi.c
+++ b/drivers/ide/ide-acpi.c
@@ -584,7 +584,7 @@ void ide_acpi_get_timing(ide_hwif_t *hwif)
  * This function executes the _STM ACPI method for the target channel.
  *
  * _STM requires Identify Drive data, which has to passed as an argument.
- * Unfortunately hd_driveid is a mangled version which we can't readily
+ * Unfortunately drive->id is a mangled version which we can't readily
  * use; hence we'll get the information afresh.
  */
 void ide_acpi_push_timing(ide_hwif_t *hwif)
@@ -614,10 +614,10 @@ void ide_acpi_push_timing(ide_hwif_t *hwif)
         in_params[0].buffer.length = sizeof(struct GTM_buffer);
         in_params[0].buffer.pointer = (u8 *)&hwif->acpidata->gtm;
         in_params[1].type = ACPI_TYPE_BUFFER;
-        in_params[1].buffer.length = sizeof(struct hd_driveid);
+        in_params[1].buffer.length = sizeof(ATA_ID_WORDS * 2);
         in_params[1].buffer.pointer = (u8 *)&master->idbuff;
         in_params[2].type = ACPI_TYPE_BUFFER;
-        in_params[2].buffer.length = sizeof(struct hd_driveid);
+        in_params[2].buffer.length = sizeof(ATA_ID_WORDS * 2);
         in_params[2].buffer.pointer = (u8 *)&slave->idbuff;
         /* Output buffer: _STM has no output */
 
diff --git a/drivers/ide/ide-cd.c b/drivers/ide/ide-cd.c
index 03c2cb6a58bc..46f9720f1ec9 100644
--- a/drivers/ide/ide-cd.c
+++ b/drivers/ide/ide-cd.c
@@ -1866,14 +1866,14 @@ static const struct cd_list_entry ide_cd_quirks_list[] = {
         { NULL, NULL, 0 }
 };
 
-static unsigned int ide_cd_flags(struct hd_driveid *id)
+static unsigned int ide_cd_flags(u16 *id)
 {
         const struct cd_list_entry *cle = ide_cd_quirks_list;
 
         while (cle->id_model) {
-                if (strcmp(cle->id_model, id->model) == 0 &&
+                if (strcmp(cle->id_model, (char *)&id[ATA_ID_PROD]) == 0 &&
                     (cle->id_firmware == NULL ||
-                     strstr(id->fw_rev, cle->id_firmware)))
+                     strstr((char *)&id[ATA_ID_FW_REV], cle->id_firmware)))
                         return cle->cd_flags;
                 cle++;
         }
@@ -1885,7 +1885,8 @@ static int ide_cdrom_setup(ide_drive_t *drive)
 {
         struct cdrom_info *cd = drive->driver_data;
         struct cdrom_device_info *cdi = &cd->devinfo;
-        struct hd_driveid *id = drive->id;
+        u16 *id = drive->id;
+        char *fw_rev = (char *)&id[ATA_ID_FW_REV];
         int nslots;
 
         blk_queue_prep_rq(drive->queue, ide_cdrom_prep_fn);
@@ -1900,15 +1901,15 @@ static int ide_cdrom_setup(ide_drive_t *drive)
         drive->atapi_flags = IDE_AFLAG_MEDIA_CHANGED | IDE_AFLAG_NO_EJECT |
                        ide_cd_flags(id);
 
-        if ((id->config & 0x0060) == 0x20)
+        if ((id[ATA_ID_CONFIG] & 0x0060) == 0x20)
                 drive->atapi_flags |= IDE_AFLAG_DRQ_INTERRUPT;
 
         if ((drive->atapi_flags & IDE_AFLAG_VERTOS_300_SSD) &&
-            id->fw_rev[4] == '1' && id->fw_rev[6] <= '2')
+            fw_rev[4] == '1' && fw_rev[6] <= '2')
                 drive->atapi_flags |= (IDE_AFLAG_TOCTRACKS_AS_BCD |
                                      IDE_AFLAG_TOCADDR_AS_BCD);
         else if ((drive->atapi_flags & IDE_AFLAG_VERTOS_600_ESD) &&
-                 id->fw_rev[4] == '1' && id->fw_rev[6] <= '2')
+                 fw_rev[4] == '1' && fw_rev[6] <= '2')
                 drive->atapi_flags |= IDE_AFLAG_TOCTRACKS_AS_BCD;
         else if (drive->atapi_flags & IDE_AFLAG_SANYO_3CD)
                 /* 3 => use CD in slot 0 */
diff --git a/drivers/ide/ide-disk.c b/drivers/ide/ide-disk.c
index 33ea8c048717..f1669bca3cab 100644
--- a/drivers/ide/ide-disk.c
+++ b/drivers/ide/ide-disk.c
@@ -99,12 +99,13 @@ static void ide_disk_put(struct ide_disk_obj *idkp)
  *
  * It is called only once for each drive.
  */
-static int lba_capacity_is_ok(struct hd_driveid *id)
+static int lba_capacity_is_ok(u16 *id)
 {
+        struct hd_driveid *driveid = (struct hd_driveid *)id;
         unsigned long lba_sects, chs_sects, head, tail;
 
         /* No non-LBA info .. so valid! */
-        if (id->cyls == 0)
+        if (id[ATA_ID_CYLS] == 0)
                 return 1;
 
         /*
@@ -113,15 +114,15 @@ static int lba_capacity_is_ok(struct hd_driveid *id)
          * Some drives can be jumpered to use 15 heads instead of 16.
          * Some drives can be jumpered to use 4092 cyls instead of 16383.
          */
-        if ((id->cyls == 16383
-             || (id->cyls == 4092 && id->cur_cyls == 16383)) &&
-            id->sectors == 63 &&
-            (id->heads == 15 || id->heads == 16) &&
-            (id->lba_capacity >= 16383*63*id->heads))
+        if ((id[ATA_ID_CYLS] == 16383 ||
+             (id[ATA_ID_CYLS] == 4092 && id[ATA_ID_CUR_CYLS] == 16383)) &&
+            id[ATA_ID_SECTORS] == 63 &&
+            (id[ATA_ID_HEADS] == 15 || id[ATA_ID_HEADS] == 16) &&
+            (driveid->lba_capacity >= 16383 * 63 * id[ATA_ID_HEADS]))
                 return 1;
 
-        lba_sects   = id->lba_capacity;
-        chs_sects   = id->cyls * id->heads * id->sectors;
+        lba_sects = driveid->lba_capacity;
+        chs_sects = id[ATA_ID_CYLS] * id[ATA_ID_HEADS] * id[ATA_ID_SECTORS];
 
         /* perform a rough sanity check on lba_sects:  within 10% is OK */
         if ((lba_sects - chs_sects) < chs_sects/10)
@@ -132,7 +133,7 @@ static int lba_capacity_is_ok(struct hd_driveid *id)
         tail = (lba_sects & 0xffff);
         lba_sects = (head | (tail << 16));
         if ((lba_sects - chs_sects) < chs_sects/10) {
-                id->lba_capacity = lba_sects;
+                driveid->lba_capacity = lba_sects;
                 return 1;       /* lba_capacity is (now) good */
         }
 
@@ -389,18 +390,20 @@ static unsigned long long sectors_to_MB(unsigned long long n)
  * so on non-buggy drives we need test only one.
  * However, we should also check whether these fields are valid.
  */
-static inline int idedisk_supports_hpa(const struct hd_driveid *id)
+static inline int idedisk_supports_hpa(const u16 *id)
 {
-        return (id->command_set_1 & 0x0400) && (id->cfs_enable_1 & 0x0400);
+        return (id[ATA_ID_COMMAND_SET_1] & 0x0400) &&
+               (id[ATA_ID_CFS_ENABLE_1] & 0x0400);
 }
 
 /*
  * The same here.
  */
-static inline int idedisk_supports_lba48(const struct hd_driveid *id)
+static inline int idedisk_supports_lba48(const u16 *id)
 {
-        return (id->command_set_2 & 0x0400) && (id->cfs_enable_2 & 0x0400)
-               && id->lba_capacity_2;
+        return (id[ATA_ID_COMMAND_SET_2] & 0x0400) &&
+               (id[ATA_ID_CFS_ENABLE_2] & 0x0400) &&
+               ((struct hd_driveid *)id)->lba_capacity_2;
 }
 
 /*
@@ -453,7 +456,8 @@ static void idedisk_check_hpa(ide_drive_t *drive)
 
 static void init_idedisk_capacity(ide_drive_t *drive)
 {
-        struct hd_driveid *id = drive->id;
+        struct hd_driveid *driveid = drive->driveid;
+        u16 *id = drive->id;
         /*
          * If this drive supports the Host Protected Area feature set,
          * then we may need to change our opinion about the drive's capacity.
@@ -463,13 +467,13 @@ static void init_idedisk_capacity(ide_drive_t *drive)
         if (idedisk_supports_lba48(id)) {
                 /* drive speaks 48-bit LBA */
                 drive->select.b.lba = 1;
-                drive->capacity64 = id->lba_capacity_2;
+                drive->capacity64 = driveid->lba_capacity_2;
                 if (hpa)
                         idedisk_check_hpa(drive);
-        } else if ((id->capability & 2) && lba_capacity_is_ok(id)) {
+        } else if ((driveid->capability & 2) && lba_capacity_is_ok(id)) {
                 /* drive speaks 28-bit LBA */
                 drive->select.b.lba = 1;
-                drive->capacity64 = id->lba_capacity;
+                drive->capacity64 = driveid->lba_capacity;
                 if (hpa)
                         idedisk_check_hpa(drive);
         } else {
@@ -523,7 +527,7 @@ static int proc_idedisk_read_cache
         int             len;
 
         if (drive->id_read)
-                len = sprintf(out, "%i\n", drive->id->buf_size / 2);
+                len = sprintf(out, "%i\n", drive->id[ATA_ID_BUF_SIZE] / 2);
         else
                 len = sprintf(out, "(none)\n");
 
@@ -618,7 +622,7 @@ static int set_multcount(ide_drive_t *drive, int arg)
         struct request *rq;
         int error;
 
-        if (arg < 0 || arg > drive->id->max_multsect)
+        if (arg < 0 || arg > drive->driveid->max_multsect)
                 return -EINVAL;
 
         if (drive->special.b.set_multmode)
@@ -650,7 +654,7 @@ static int set_nowerr(ide_drive_t *drive, int arg)
 
 static void update_ordered(ide_drive_t *drive)
 {
-        struct hd_driveid *id = drive->id;
+        u16 *id = drive->id;
         unsigned ordered = QUEUE_ORDERED_NONE;
         prepare_flush_fn *prep_fn = NULL;
 
@@ -762,8 +766,6 @@ static int set_lba_addressing(ide_drive_t *drive, int arg)
 #ifdef CONFIG_IDE_PROC_FS
 static void idedisk_add_settings(ide_drive_t *drive)
 {
-        struct hd_driveid *id = drive->id;
-
         ide_add_setting(drive, "bios_cyl", SETTING_RW, TYPE_INT, 0, 65535, 1, 1,
                         &drive->bios_cyl, NULL);
         ide_add_setting(drive, "bios_head", SETTING_RW, TYPE_BYTE, 0, 255, 1, 1,
@@ -773,7 +775,7 @@ static void idedisk_add_settings(ide_drive_t *drive)
         ide_add_setting(drive, "address", SETTING_RW, TYPE_BYTE, 0, 2, 1, 1,
                         &drive->addressing, set_lba_addressing);
         ide_add_setting(drive, "multcount", SETTING_RW, TYPE_BYTE, 0,
-                        id->max_multsect, 1, 1, &drive->mult_count,
+                        drive->driveid->max_multsect, 1, 1, &drive->mult_count,
                         set_multcount);
         ide_add_setting(drive, "nowerr", SETTING_RW, TYPE_BYTE, 0, 1, 1, 1,
                         &drive->nowerr, set_nowerr);
@@ -795,7 +797,8 @@ static inline void idedisk_add_settings(ide_drive_t *drive) { ; }
 static void idedisk_setup(ide_drive_t *drive)
 {
         ide_hwif_t *hwif = drive->hwif;
-        struct hd_driveid *id = drive->id;
+        u16 *id = drive->id;
+        char *m = (char *)&id[ATA_ID_PROD];
         unsigned long long capacity;
 
         idedisk_add_settings(drive);
@@ -807,7 +810,7 @@ static void idedisk_setup(ide_drive_t *drive)
                 /*
                  * Removable disks (eg. SYQUEST); ignore 'WD' drives
                  */
-                if (id->model[0] != 'W' || id->model[1] != 'D')
+                if (m[0] != 'W' || m[1] != 'D')
                         drive->doorlocking = 1;
         }
 
@@ -880,14 +883,14 @@ static void idedisk_setup(ide_drive_t *drive)
                          drive->name, capacity, sectors_to_MB(capacity));
 
         /* Only print cache size when it was specified */
-        if (id->buf_size)
-                printk(KERN_CONT " w/%dKiB Cache", id->buf_size / 2);
+        if (id[ATA_ID_BUF_SIZE])
+                printk(KERN_CONT " w/%dKiB Cache", id[ATA_ID_BUF_SIZE] / 2);
 
         printk(KERN_CONT ", CHS=%d/%d/%d\n",
                          drive->bios_cyl, drive->bios_head, drive->bios_sect);
 
         /* write cache enabled? */
-        if ((id->csfo & 1) || (id->cfs_enable_1 & (1 << 5)))
+        if ((id[ATA_ID_CSFO] & 1) || (id[ATA_ID_CFS_ENABLE_1] & (1 << 5)))
                 drive->wcache = 1;
 
         write_cache(drive, 1);
diff --git a/drivers/ide/ide-dma.c b/drivers/ide/ide-dma.c
index 3fa07c0aeaa4..abab26de7687 100644
--- a/drivers/ide/ide-dma.c
+++ b/drivers/ide/ide-dma.c
@@ -288,7 +288,7 @@ EXPORT_SYMBOL_GPL(ide_destroy_dmatable);
 static int config_drive_for_dma (ide_drive_t *drive)
 {
         ide_hwif_t *hwif = drive->hwif;
-        struct hd_driveid *id = drive->id;
+        u16 *id = drive->id;
 
         if (drive->media != ide_disk) {
                 if (hwif->host_flags & IDE_HFLAG_NO_ATAPI_DMA)
@@ -299,16 +299,17 @@ static int config_drive_for_dma (ide_drive_t *drive)
          * Enable DMA on any drive that has
          * UltraDMA (mode 0/1/2/3/4/5/6) enabled
          */
-        if ((id->field_valid & 4) && ((id->dma_ultra >> 8) & 0x7f))
+        if ((id[ATA_ID_FIELD_VALID] & 4) &&
+            ((id[ATA_ID_UDMA_MODES] >> 8) & 0x7f))
                 return 1;
 
         /*
          * Enable DMA on any drive that has mode2 DMA
          * (multi or single) enabled
          */
-        if (id->field_valid & 2)        /* regular DMA */
-                if ((id->dma_mword & 0x404) == 0x404 ||
-                    (id->dma_1word & 0x404) == 0x404)
+        if (id[ATA_ID_FIELD_VALID] & 2) /* regular DMA */
+                if ((id[ATA_ID_MWDMA_MODES] & 0x404) == 0x404 ||
+                    (id[ATA_ID_SWDMA_MODES] & 0x404) == 0x404)
                         return 1;
 
         /* Consult the list of known "good" drives */
@@ -591,12 +592,12 @@ static inline int config_drive_for_dma(ide_drive_t *drive) { return 0; }
 
 int __ide_dma_bad_drive (ide_drive_t *drive)
 {
-        struct hd_driveid *id = drive->id;
+        u16 *id = drive->id;
 
         int blacklist = ide_in_drive_list(id, drive_blacklist);
         if (blacklist) {
                 printk(KERN_WARNING "%s: Disabling (U)DMA for %s (blacklisted)\n",
-                                    drive->name, id->model);
+                                    drive->name, (char *)&id[ATA_ID_PROD]);
                 return blacklist;
         }
         return 0;
@@ -612,21 +613,21 @@ static const u8 xfer_mode_bases[] = {
 
 static unsigned int ide_get_mode_mask(ide_drive_t *drive, u8 base, u8 req_mode)
 {
-        struct hd_driveid *id = drive->id;
+        u16 *id = drive->id;
         ide_hwif_t *hwif = drive->hwif;
         const struct ide_port_ops *port_ops = hwif->port_ops;
         unsigned int mask = 0;
 
         switch(base) {
         case XFER_UDMA_0:
-                if ((id->field_valid & 4) == 0)
+                if ((id[ATA_ID_FIELD_VALID] & 4) == 0)
                         break;
 
                 if (port_ops && port_ops->udma_filter)
                         mask = port_ops->udma_filter(drive);
                 else
                         mask = hwif->ultra_mask;
-                mask &= id->dma_ultra;
+                mask &= id[ATA_ID_UDMA_MODES];
 
                 /*
                  * avoid false cable warning from eighty_ninty_three()
@@ -637,19 +638,19 @@ static unsigned int ide_get_mode_mask(ide_drive_t *drive, u8 base, u8 req_mode)
                 }
                 break;
         case XFER_MW_DMA_0:
-                if ((id->field_valid & 2) == 0)
+                if ((id[ATA_ID_FIELD_VALID] & 2) == 0)
                         break;
                 if (port_ops && port_ops->mdma_filter)
                         mask = port_ops->mdma_filter(drive);
                 else
                         mask = hwif->mwdma_mask;
-                mask &= id->dma_mword;
+                mask &= id[ATA_ID_MWDMA_MODES];
                 break;
         case XFER_SW_DMA_0:
-                if (id->field_valid & 2) {
-                        mask = id->dma_1word & hwif->swdma_mask;
-                } else if (id->tDMA) {
-                        u8 mode = id->tDMA;
+                if (id[ATA_ID_FIELD_VALID] & 2) {
+                        mask = id[ATA_ID_SWDMA_MODES] & hwif->swdma_mask;
+                } else if (drive->driveid->tDMA) {
+                        u8 mode = drive->driveid->tDMA;
 
                         /*
                          * if the mode is valid convert it to the mask
@@ -706,7 +707,8 @@ u8 ide_find_dma_mode(ide_drive_t *drive, u8 req_mode)
                 /*
                  * is this correct?
                  */
-                if (ide_dma_good_drive(drive) && drive->id->eide_dma_time < 150)
+                if (ide_dma_good_drive(drive) &&
+                    drive->id[ATA_ID_EIDE_DMA_TIME] < 150)
                         mode = XFER_MW_DMA_1;
         }
 
@@ -725,7 +727,7 @@ static int ide_tune_dma(ide_drive_t *drive)
         ide_hwif_t *hwif = drive->hwif;
         u8 speed;
 
-        if (drive->nodma || (drive->id->capability & 1) == 0)
+        if (drive->nodma || (drive->driveid->capability & 1) == 0)
                 return 0;
 
         /* consult the list of known "bad" drives */
@@ -767,13 +769,15 @@ static int ide_dma_check(ide_drive_t *drive)
 
 int ide_id_dma_bug(ide_drive_t *drive)
 {
-        struct hd_driveid *id = drive->id;
+        u16 *id = drive->id;
 
-        if (id->field_valid & 4) {
-                if ((id->dma_ultra >> 8) && (id->dma_mword >> 8))
+        if (id[ATA_ID_FIELD_VALID] & 4) {
+                if ((id[ATA_ID_UDMA_MODES] >> 8) &&
+                    (id[ATA_ID_MWDMA_MODES] >> 8))
                         goto err_out;
-        } else if (id->field_valid & 2) {
-                if ((id->dma_mword >> 8) && (id->dma_1word >> 8))
+        } else if (id[ATA_ID_FIELD_VALID] & 2) {
+                if ((id[ATA_ID_MWDMA_MODES] >> 8) &&
+                    (id[ATA_ID_SWDMA_MODES] >> 8))
                         goto err_out;
         }
         return 0;
diff --git a/drivers/ide/ide-floppy.c b/drivers/ide/ide-floppy.c
index e9034c0125f3..67f93a46f510 100644
--- a/drivers/ide/ide-floppy.c
+++ b/drivers/ide/ide-floppy.c
@@ -965,12 +965,12 @@ static sector_t idefloppy_capacity(ide_drive_t *drive)
  * Check whether we can support a drive, based on the ATAPI IDENTIFY command
  * results.
  */
-static int idefloppy_identify_device(ide_drive_t *drive, struct hd_driveid *id)
+static int idefloppy_identify_device(ide_drive_t *drive, u16 *id)
 {
         u8 gcw[2];
         u8 device_type, protocol, removable, drq_type, packet_size;
 
-        *((u16 *) &gcw) = id->config;
+        *((u16 *)&gcw) = id[ATA_ID_CONFIG];
 
         device_type =  gcw[1] & 0x1F;
         removable   = (gcw[0] & 0x80) >> 7;
@@ -981,7 +981,8 @@ static int idefloppy_identify_device(ide_drive_t *drive, struct hd_driveid *id)
 #ifdef CONFIG_PPC
         /* kludge for Apple PowerBook internal zip */
         if (device_type == 5 &&
-            !strstr(id->model, "CD-ROM") && strstr(id->model, "ZIP"))
+            !strstr((char *)&id[ATA_ID_PROD], "CD-ROM") &&
+            strstr((char *)&id[ATA_ID_PROD], "ZIP"))
                 device_type = 0;
 #endif
 
@@ -1024,9 +1025,10 @@ static inline void idefloppy_add_settings(ide_drive_t *drive) { ; }
 
 static void idefloppy_setup(ide_drive_t *drive, idefloppy_floppy_t *floppy)
 {
+        u16 *id = drive->id;
         u8 gcw[2];
 
-        *((u16 *) &gcw) = drive->id->config;
+        *((u16 *)&gcw) = id[ATA_ID_CONFIG];
         floppy->pc = floppy->pc_stack;
         drive->pc_callback = ide_floppy_callback;
 
@@ -1041,7 +1043,7 @@ static void idefloppy_setup(ide_drive_t *drive, idefloppy_floppy_t *floppy)
          * it. It should be fixed as of version 1.9, but to be on the safe side
          * we'll leave the limitation below for the 2.2.x tree.
          */
-        if (!strncmp(drive->id->model, "IOMEGA ZIP 100 ATAPI", 20)) {
+        if (!strncmp((char *)&id[ATA_ID_PROD], "IOMEGA ZIP 100 ATAPI", 20)) {
                 drive->atapi_flags |= IDE_AFLAG_ZIP_DRIVE;
                 /* This value will be visible in the /proc/ide/hdx/settings */
                 floppy->ticks = IDEFLOPPY_TICKS_DELAY;
@@ -1052,7 +1054,7 @@ static void idefloppy_setup(ide_drive_t *drive, idefloppy_floppy_t *floppy)
          * Guess what? The IOMEGA Clik! drive also needs the above fix. It makes
          * nasty clicking noises without it, so please don't remove this.
          */
-        if (strncmp(drive->id->model, "IOMEGA Clik!", 11) == 0) {
+        if (strncmp((char *)&id[ATA_ID_PROD], "IOMEGA Clik!", 11) == 0) {
                 blk_queue_max_sectors(drive->queue, 64);
                 drive->atapi_flags |= IDE_AFLAG_CLIK_DRIVE;
         }
diff --git a/drivers/ide/ide-iops.c b/drivers/ide/ide-iops.c
index 68d655e0fa47..01b1943b315e 100644
--- a/drivers/ide/ide-iops.c
+++ b/drivers/ide/ide-iops.c
@@ -400,11 +400,11 @@ const struct ide_tp_ops default_tp_ops = {
         .output_data            = ide_output_data,
 };
 
-void ide_fix_driveid(struct hd_driveid *driveid)
+void ide_fix_driveid(u16 *id)
 {
 #ifndef __LITTLE_ENDIAN
 # ifdef __BIG_ENDIAN
-        u16 *id = (u16 *)driveid;
+        struct hd_driveid *driveid = (struct hd_driveid *)id;
         int i;
 
         for (i = 0; i < 256; i++) {
@@ -593,18 +593,18 @@ EXPORT_SYMBOL(ide_wait_stat);
 /**
  *      ide_in_drive_list       -       look for drive in black/white list
  *      @id: drive identifier
- *      @drive_table: list to inspect
+ *      @table: list to inspect
  *
  *      Look for a drive in the blacklist and the whitelist tables
  *      Returns 1 if the drive is found in the table.
  */
 
-int ide_in_drive_list(struct hd_driveid *id, const struct drive_list_entry *drive_table)
+int ide_in_drive_list(u16 *id, const struct drive_list_entry *table)
 {
-        for ( ; drive_table->id_model; drive_table++)
-                if ((!strcmp(drive_table->id_model, id->model)) &&
-                    (!drive_table->id_firmware ||
-                     strstr(id->fw_rev, drive_table->id_firmware)))
+        for ( ; table->id_model; table++)
+                if ((!strcmp(table->id_model, (char *)&id[ATA_ID_PROD])) &&
+                    (!table->id_firmware ||
+                     strstr((char *)&id[ATA_ID_FW_REV], table->id_firmware)))
                         return 1;
         return 0;
 }
@@ -635,7 +635,7 @@ static const struct drive_list_entry ivb_list[] = {
 u8 eighty_ninty_three (ide_drive_t *drive)
 {
         ide_hwif_t *hwif = drive->hwif;
-        struct hd_driveid *id = drive->id;
+        u16 *id = drive->id;
         int ivb = ide_in_drive_list(id, ivb_list);
 
         if (hwif->cbl == ATA_CBL_PATA40_SHORT)
@@ -657,7 +657,8 @@ u8 eighty_ninty_three (ide_drive_t *drive)
          * - force bit13 (80c cable present) check also for !ivb devices
          *   (unless the slave device is pre-ATA3)
          */
-        if ((id->hw_config & 0x4000) || (ivb && (id->hw_config & 0x2000)))
+        if ((id[ATA_ID_HW_CONFIG] & 0x4000) ||
+            (ivb && (id[ATA_ID_HW_CONFIG] & 0x2000)))
                 return 1;
 
 no_80w:
@@ -678,7 +679,7 @@ int ide_driveid_update(ide_drive_t *drive)
 {
         ide_hwif_t *hwif = drive->hwif;
         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
-        struct hd_driveid *id;
+        u16 *id;
         unsigned long timeout, flags;
         u8 stat;
 
@@ -722,16 +723,16 @@ int ide_driveid_update(ide_drive_t *drive)
         local_irq_enable();
         local_irq_restore(flags);
         ide_fix_driveid(id);
-        if (id) {
-                drive->id->dma_ultra = id->dma_ultra;
-                drive->id->dma_mword = id->dma_mword;
-                drive->id->dma_1word = id->dma_1word;
-                /* anything more ? */
-                kfree(id);
-
-                if (drive->using_dma && ide_id_dma_bug(drive))
-                        ide_dma_off(drive);
-        }
+
+        drive->id[ATA_ID_UDMA_MODES]  = id[ATA_ID_UDMA_MODES];
+        drive->id[ATA_ID_MWDMA_MODES] = id[ATA_ID_MWDMA_MODES];
+        drive->id[ATA_ID_SWDMA_MODES] = id[ATA_ID_SWDMA_MODES];
+        /* anything more ? */
+
+        kfree(id);
+
+        if (drive->using_dma && ide_id_dma_bug(drive))
+                ide_dma_off(drive);
 
         return 1;
 }
@@ -740,6 +741,7 @@ int ide_config_drive_speed(ide_drive_t *drive, u8 speed)
 {
         ide_hwif_t *hwif = drive->hwif;
         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
+        u16 *id = drive->id, i;
         int error = 0;
         u8 stat;
         ide_task_t task;
@@ -750,7 +752,7 @@ int ide_config_drive_speed(ide_drive_t *drive, u8 speed)
 #endif
 
         /* Skip setting PIO flow-control modes on pre-EIDE drives */
-        if ((speed & 0xf8) == XFER_PIO_0 && !(drive->id->capability & 0x08))
+        if ((speed & 0xf8) == XFER_PIO_0 && !(drive->driveid->capability & 8))
                 goto skip;
 
         /*
@@ -802,9 +804,9 @@ int ide_config_drive_speed(ide_drive_t *drive, u8 speed)
                 return error;
         }
 
-        drive->id->dma_ultra &= ~0xFF00;
-        drive->id->dma_mword &= ~0x0F00;
-        drive->id->dma_1word &= ~0x0F00;
+        id[ATA_ID_UDMA_MODES]  &= ~0xFF00;
+        id[ATA_ID_MWDMA_MODES] &= ~0x0F00;
+        id[ATA_ID_SWDMA_MODES] &= ~0x0F00;
 
  skip:
 #ifdef CONFIG_BLK_DEV_IDEDMA
@@ -814,23 +816,17 @@ int ide_config_drive_speed(ide_drive_t *drive, u8 speed)
                 ide_dma_off_quietly(drive);
 #endif
 
-        switch(speed) {
-                case XFER_UDMA_7:   drive->id->dma_ultra |= 0x8080; break;
-                case XFER_UDMA_6:   drive->id->dma_ultra |= 0x4040; break;
-                case XFER_UDMA_5:   drive->id->dma_ultra |= 0x2020; break;
-                case XFER_UDMA_4:   drive->id->dma_ultra |= 0x1010; break;
-                case XFER_UDMA_3:   drive->id->dma_ultra |= 0x0808; break;
-                case XFER_UDMA_2:   drive->id->dma_ultra |= 0x0404; break;
-                case XFER_UDMA_1:   drive->id->dma_ultra |= 0x0202; break;
-                case XFER_UDMA_0:   drive->id->dma_ultra |= 0x0101; break;
-                case XFER_MW_DMA_2: drive->id->dma_mword |= 0x0404; break;
-                case XFER_MW_DMA_1: drive->id->dma_mword |= 0x0202; break;
-                case XFER_MW_DMA_0: drive->id->dma_mword |= 0x0101; break;
-                case XFER_SW_DMA_2: drive->id->dma_1word |= 0x0404; break;
-                case XFER_SW_DMA_1: drive->id->dma_1word |= 0x0202; break;
-                case XFER_SW_DMA_0: drive->id->dma_1word |= 0x0101; break;
-                default: break;
+        if (speed >= XFER_UDMA_0) {
+                i = 1 << (speed - XFER_UDMA_0);
+                id[ATA_ID_UDMA_MODES] |= (i << 8 | i);
+        } else if (speed >= XFER_MW_DMA_0) {
+                i = 1 << (speed - XFER_MW_DMA_0);
+                id[ATA_ID_MWDMA_MODES] |= (i << 8 | i);
+        } else if (speed >= XFER_SW_DMA_0) {
+                i = 1 << (speed - XFER_SW_DMA_0);
+                id[ATA_ID_SWDMA_MODES] |= (i << 8 | i);
         }
+
         if (!drive->init_speed)
                 drive->init_speed = speed;
         drive->current_speed = speed;
@@ -1035,7 +1031,7 @@ out:
 
 static void ide_disk_pre_reset(ide_drive_t *drive)
 {
-        int legacy = (drive->id->cfs_enable_2 & 0x0400) ? 0 : 1;
+        int legacy = (drive->id[ATA_ID_CFS_ENABLE_2] & 0x0400) ? 0 : 1;
 
         drive->special.all = 0;
         drive->special.b.set_geometry = legacy;
diff --git a/drivers/ide/ide-lib.c b/drivers/ide/ide-lib.c
index 97fefabea8b8..3066d7e75c73 100644
--- a/drivers/ide/ide-lib.c
+++ b/drivers/ide/ide-lib.c
@@ -90,29 +90,31 @@ static u8 ide_rate_filter(ide_drive_t *drive, u8 speed)
 
 u8 ide_get_best_pio_mode (ide_drive_t *drive, u8 mode_wanted, u8 max_mode)
 {
-        int pio_mode;
-        struct hd_driveid* id = drive->id;
-        int overridden  = 0;
+        u16 *id = drive->id;
+        int pio_mode = -1, overridden = 0;
 
         if (mode_wanted != 255)
                 return min_t(u8, mode_wanted, max_mode);
 
-        if ((drive->hwif->host_flags & IDE_HFLAG_PIO_NO_BLACKLIST) == 0 &&
-            (pio_mode = ide_scan_pio_blacklist(id->model)) != -1) {
+        if ((drive->hwif->host_flags & IDE_HFLAG_PIO_NO_BLACKLIST) == 0)
+                pio_mode = ide_scan_pio_blacklist((char *)&id[ATA_ID_PROD]);
+
+        if (pio_mode != -1) {
                 printk(KERN_INFO "%s: is on PIO blacklist\n", drive->name);
         } else {
-                pio_mode = id->tPIO;
+                pio_mode = drive->driveid->tPIO;
                 if (pio_mode > 2) {     /* 2 is maximum allowed tPIO value */
                         pio_mode = 2;
                         overridden = 1;
                 }
-                if (id->field_valid & 2) {        /* drive implements ATA2? */
-                        if (id->capability & 8) { /* IORDY supported? */
-                                if (id->eide_pio_modes & 7) {
+
+                if (id[ATA_ID_FIELD_VALID] & 2) {             /* ATA2? */
+                        if (drive->driveid->capability & 8) { /* IORDY sup? */
+                                if (id[ATA_ID_PIO_MODES] & 7) {
                                         overridden = 0;
-                                        if (id->eide_pio_modes & 4)
+                                        if (id[ATA_ID_PIO_MODES] & 4)
                                                 pio_mode = 5;
-                                        else if (id->eide_pio_modes & 2)
+                                        else if (id[ATA_ID_PIO_MODES] & 2)
                                                 pio_mode = 4;
                                         else
                                                 pio_mode = 3;
diff --git a/drivers/ide/ide-probe.c b/drivers/ide/ide-probe.c
index a776a6d73c54..b4f8ca106639 100644
--- a/drivers/ide/ide-probe.c
+++ b/drivers/ide/ide-probe.c
@@ -50,44 +50,44 @@
  
 static void generic_id(ide_drive_t *drive)
 {
-        drive->id->cyls = drive->cyl;
-        drive->id->heads = drive->head;
-        drive->id->sectors = drive->sect;
-        drive->id->cur_cyls = drive->cyl;
-        drive->id->cur_heads = drive->head;
-        drive->id->cur_sectors = drive->sect;
+        u16 *id = drive->id;
+
+        id[ATA_ID_CUR_CYLS]     = id[ATA_ID_CYLS]       = drive->cyl;
+        id[ATA_ID_CUR_HEADS]    = id[ATA_ID_HEADS]      = drive->head;
+        id[ATA_ID_CUR_SECTORS]  = id[ATA_ID_SECTORS]    = drive->sect;
 }
 
 static void ide_disk_init_chs(ide_drive_t *drive)
 {
-        struct hd_driveid *id = drive->id;
+        u16 *id = drive->id;
 
         /* Extract geometry if we did not already have one for the drive */
         if (!drive->cyl || !drive->head || !drive->sect) {
-                drive->cyl  = drive->bios_cyl  = id->cyls;
-                drive->head = drive->bios_head = id->heads;
-                drive->sect = drive->bios_sect = id->sectors;
+                drive->cyl  = drive->bios_cyl  = id[ATA_ID_CYLS];
+                drive->head = drive->bios_head = id[ATA_ID_HEADS];
+                drive->sect = drive->bios_sect = id[ATA_ID_SECTORS];
         }
 
         /* Handle logical geometry translation by the drive */
-        if ((id->field_valid & 1) && id->cur_cyls &&
-            id->cur_heads && (id->cur_heads <= 16) && id->cur_sectors) {
-                drive->cyl  = id->cur_cyls;
-                drive->head = id->cur_heads;
-                drive->sect = id->cur_sectors;
+        if ((id[ATA_ID_FIELD_VALID] & 1) && id[ATA_ID_CUR_CYLS] &&
+            id[ATA_ID_CUR_HEADS] && id[ATA_ID_CUR_HEADS] <= 16 &&
+            id[ATA_ID_CUR_SECTORS]) {
+                drive->cyl  = id[ATA_ID_CUR_CYLS];
+                drive->head = id[ATA_ID_CUR_HEADS];
+                drive->sect = id[ATA_ID_CUR_SECTORS];
         }
 
         /* Use physical geometry if what we have still makes no sense */
-        if (drive->head > 16 && id->heads && id->heads <= 16) {
-                drive->cyl  = id->cyls;
-                drive->head = id->heads;
-                drive->sect = id->sectors;
+        if (drive->head > 16 && id[ATA_ID_HEADS] && id[ATA_ID_HEADS] <= 16) {
+                drive->cyl  = id[ATA_ID_CYLS];
+                drive->head = id[ATA_ID_HEADS];
+                drive->sect = id[ATA_ID_SECTORS];
         }
 }
 
 static void ide_disk_init_mult_count(ide_drive_t *drive)
 {
-        struct hd_driveid *id = drive->id;
+        struct hd_driveid *id = drive->driveid;
 
         if (id->max_multsect) {
 #ifdef CONFIG_IDEDISK_MULTI_MODE
@@ -118,10 +118,10 @@ static void ide_disk_init_mult_count(ide_drive_t *drive)
 static inline void do_identify (ide_drive_t *drive, u8 cmd)
 {
         ide_hwif_t *hwif = HWIF(drive);
+        u16 *id = drive->id;
+        char *m = (char *)&id[ATA_ID_PROD];
         int bswap = 1;
-        struct hd_driveid *id;
 
-        id = drive->id;
         /* read 512 bytes of id info */
         hwif->tp_ops->input_data(drive, NULL, id, SECTOR_SIZE);
 
@@ -138,23 +138,24 @@ static inline void do_identify (ide_drive_t *drive, u8 cmd)
          *  WIN_PIDENTIFY *usually* returns little-endian info.
          */
         if (cmd == WIN_PIDENTIFY) {
-                if ((id->model[0] == 'N' && id->model[1] == 'E') /* NEC */
-                 || (id->model[0] == 'F' && id->model[1] == 'X') /* Mitsumi */
-                 || (id->model[0] == 'P' && id->model[1] == 'i'))/* Pioneer */
+                if ((m[0] == 'N' && m[1] == 'E') ||  /* NEC */
+                    (m[0] == 'F' && m[1] == 'X') ||  /* Mitsumi */
+                    (m[0] == 'P' && m[1] == 'i'))    /* Pioneer */
                         /* Vertos drives may still be weird */
-                        bswap ^= 1;     
+                        bswap ^= 1;
         }
-        ide_fixstring(id->model,     sizeof(id->model),     bswap);
-        ide_fixstring(id->fw_rev,    sizeof(id->fw_rev),    bswap);
-        ide_fixstring(id->serial_no, sizeof(id->serial_no), bswap);
+
+        ide_fixstring(m, ATA_ID_PROD_LEN, bswap);
+        ide_fixstring((char *)&id[ATA_ID_FW_REV], ATA_ID_FW_REV_LEN, bswap);
+        ide_fixstring((char *)&id[ATA_ID_SERNO], ATA_ID_SERNO_LEN, bswap);
 
         /* we depend on this a lot! */
-        id->model[sizeof(id->model)-1] = '\0';
+        m[ATA_ID_PROD_LEN - 1] = '\0';
 
-        if (strstr(id->model, "E X A B Y T E N E S T"))
+        if (strstr(m, "E X A B Y T E N E S T"))
                 goto err_misc;
 
-        printk(KERN_INFO "%s: %s, ", drive->name, id->model);
+        printk(KERN_INFO "%s: %s, ", drive->name, m);
 
         drive->present = 1;
         drive->dead = 0;
@@ -163,15 +164,15 @@ static inline void do_identify (ide_drive_t *drive, u8 cmd)
          * Check for an ATAPI device
          */
         if (cmd == WIN_PIDENTIFY) {
-                u8 type = (id->config >> 8) & 0x1f;
+                u8 type = (id[ATA_ID_CONFIG] >> 8) & 0x1f;
 
                 printk(KERN_CONT "ATAPI ");
                 switch (type) {
                         case ide_floppy:
-                                if (!strstr(id->model, "CD-ROM")) {
-                                        if (!strstr(id->model, "oppy") &&
-                                            !strstr(id->model, "poyp") &&
-                                            !strstr(id->model, "ZIP"))
+                                if (!strstr(m, "CD-ROM")) {
+                                        if (!strstr(m, "oppy") &&
+                                            !strstr(m, "poyp") &&
+                                            !strstr(m, "ZIP"))
                                                 printk(KERN_CONT "cdrom or floppy?, assuming ");
                                         if (drive->media != ide_cdrom) {
                                                 printk(KERN_CONT "FLOPPY");
@@ -185,8 +186,7 @@ static inline void do_identify (ide_drive_t *drive, u8 cmd)
                                 drive->removable = 1;
 #ifdef CONFIG_PPC
                                 /* kludge for Apple PowerBook internal zip */
-                                if (!strstr(id->model, "CD-ROM") &&
-                                    strstr(id->model, "ZIP")) {
+                                if (!strstr(m, "CD-ROM") && strstr(m, "ZIP")) {
                                         printk(KERN_CONT "FLOPPY");
                                         type = ide_floppy;
                                         break;
@@ -220,14 +220,13 @@ static inline void do_identify (ide_drive_t *drive, u8 cmd)
          * 0x848a = CompactFlash device
          * These are *not* removable in Linux definition of the term
          */
-
-        if ((id->config != 0x848a) && (id->config & (1<<7)))
+        if (id[ATA_ID_CONFIG] != 0x848a && (id[ATA_ID_CONFIG] & (1 << 7)))
                 drive->removable = 1;
 
         drive->media = ide_disk;
 
         printk(KERN_CONT "%s DISK drive\n",
-                (id->config == 0x848a) ? "CFA" : "ATA");
+                (id[ATA_ID_CONFIG] == 0x848a) ? "CFA" : "ATA");
 
         return;
 
@@ -525,7 +524,8 @@ static void enable_nest (ide_drive_t *drive)
         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
         u8 stat;
 
-        printk(KERN_INFO "%s: enabling %s -- ", hwif->name, drive->id->model);
+        printk(KERN_INFO "%s: enabling %s -- ",
+                hwif->name, (char *)&drive->id[ATA_ID_PROD]);
 
         SELECT_DRIVE(drive);
         msleep(50);
@@ -566,6 +566,8 @@ static void enable_nest (ide_drive_t *drive)
  
 static inline u8 probe_for_drive (ide_drive_t *drive)
 {
+        char *m;
+
         /*
          *      In order to keep things simple we have an id
          *      block for all drives at all times. If the device
@@ -582,8 +584,10 @@ static inline u8 probe_for_drive (ide_drive_t *drive)
                 printk(KERN_ERR "ide: out of memory for id data.\n");
                 return 0;
         }
-        strcpy(drive->id->model, "UNKNOWN");
-        
+
+        m = (char *)&drive->id[ATA_ID_PROD];
+        strcpy(m, "UNKNOWN");
+
         /* skip probing? */
         if (!drive->noprobe)
         {
@@ -595,7 +599,8 @@ static inline u8 probe_for_drive (ide_drive_t *drive)
                 if (!drive->present)
                         /* drive not found */
                         return 0;
-                if (strstr(drive->id->model, "E X A B Y T E N E S T"))
+
+                if (strstr(m, "E X A B Y T E N E S T"))
                         enable_nest(drive);
         
                 /* identification failed? */
@@ -739,36 +744,38 @@ out:
 
 /**
  *      ide_undecoded_slave     -       look for bad CF adapters
- *      @drive1: drive
+ *      @dev1: slave device
  *
  *      Analyse the drives on the interface and attempt to decide if we
  *      have the same drive viewed twice. This occurs with crap CF adapters
  *      and PCMCIA sometimes.
  */
 
-void ide_undecoded_slave(ide_drive_t *drive1)
+void ide_undecoded_slave(ide_drive_t *dev1)
 {
-        ide_drive_t *drive0 = &drive1->hwif->drives[0];
+        ide_drive_t *dev0 = &dev1->hwif->drives[0];
 
-        if ((drive1->dn & 1) == 0 || drive0->present == 0)
+        if ((dev1->dn & 1) == 0 || dev0->present == 0)
                 return;
 
         /* If the models don't match they are not the same product */
-        if (strcmp(drive0->id->model, drive1->id->model))
+        if (strcmp((char *)&dev0->id[ATA_ID_PROD],
+                   (char *)&dev1->id[ATA_ID_PROD]))
                 return;
 
         /* Serial numbers do not match */
-        if (strncmp(drive0->id->serial_no, drive1->id->serial_no, 20))
+        if (strncmp((char *)&dev0->id[ATA_ID_SERNO],
+                    (char *)&dev1->id[ATA_ID_SERNO], ATA_ID_SERNO_LEN))
                 return;
 
         /* No serial number, thankfully very rare for CF */
-        if (drive0->id->serial_no[0] == 0)
+        if (*(char *)&dev0->id[ATA_ID_SERNO] == 0)
                 return;
 
         /* Appears to be an IDE flash adapter with decode bugs */
         printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n");
 
-        drive1->present = 0;
+        dev1->present = 0;
 }
 
 EXPORT_SYMBOL_GPL(ide_undecoded_slave);
@@ -852,7 +859,7 @@ static void ide_port_tune_devices(ide_hwif_t *hwif)
                 if (hwif->host_flags & IDE_HFLAG_NO_IO_32BIT)
                         drive->no_io_32bit = 1;
                 else
-                        drive->no_io_32bit = drive->id->dword_io ? 1 : 0;
+                        drive->no_io_32bit = drive->id[ATA_ID_DWORD_IO] ? 1 : 0;
         }
 }
 
diff --git a/drivers/ide/ide-proc.c b/drivers/ide/ide-proc.c
index f66c9c3f6fc6..0bdbb9bf90ba 100644
--- a/drivers/ide/ide-proc.c
+++ b/drivers/ide/ide-proc.c
@@ -561,11 +561,10 @@ static int proc_ide_read_dmodel
         (char *page, char **start, off_t off, int count, int *eof, void *data)
 {
         ide_drive_t     *drive = (ide_drive_t *) data;
-        struct hd_driveid *id = drive->id;
+        char            *m = (char *)&drive->id[ATA_ID_PROD];
         int             len;
 
-        len = sprintf(page, "%.40s\n",
-                (id && id->model[0]) ? (char *)id->model : "(none)");
+        len = sprintf(page, "%.40s\n", m[0] ? m : "(none)");
         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
 }
 
diff --git a/drivers/ide/ide-tape.c b/drivers/ide/ide-tape.c
index a373cc4142b7..2c4c6674db61 100644
--- a/drivers/ide/ide-tape.c
+++ b/drivers/ide/ide-tape.c
@@ -2311,7 +2311,7 @@ static int idetape_identify_device(ide_drive_t *drive)
         if (drive->id_read == 0)
                 return 1;
 
-        *((unsigned short *) &gcw) = drive->id->config;
+        *((u16 *)&gcw) = drive->id[ATA_ID_CONFIG];
 
         protocol        =   (gcw[1] & 0xC0) >> 6;
         device_type     =    gcw[1] & 0x1F;
@@ -2463,7 +2463,7 @@ static void idetape_setup(ide_drive_t *drive, idetape_tape_t *tape, int minor)
                 drive->dsc_overlap = 0;
         }
         /* Seagate Travan drives do not support DSC overlap. */
-        if (strstr(drive->id->model, "Seagate STT3401"))
+        if (strstr((char *)&drive->id[ATA_ID_PROD], "Seagate STT3401"))
                 drive->dsc_overlap = 0;
         tape->minor = minor;
         tape->name[0] = 'h';
@@ -2471,7 +2471,8 @@ static void idetape_setup(ide_drive_t *drive, idetape_tape_t *tape, int minor)
         tape->name[2] = '0' + minor;
         tape->chrdev_dir = IDETAPE_DIR_NONE;
         tape->pc = tape->pc_stack;
-        *((unsigned short *) &gcw) = drive->id->config;
+
+        *((u16 *)&gcw) = drive->id[ATA_ID_CONFIG];
 
         /* Command packet DRQ type */
         if (((gcw[0] & 0x60) >> 5) == 1)
diff --git a/drivers/ide/ide-taskfile.c b/drivers/ide/ide-taskfile.c
index 7fb6f1c86272..f889373d7f95 100644
--- a/drivers/ide/ide-taskfile.c
+++ b/drivers/ide/ide-taskfile.c
@@ -729,7 +729,7 @@ int ide_cmd_ioctl (ide_drive_t *drive, unsigned int cmd, unsigned long arg)
         u8 args[4], xfer_rate = 0;
         ide_task_t tfargs;
         struct ide_taskfile *tf = &tfargs.tf;
-        struct hd_driveid *id = drive->id;
+        u16 *id = drive->id;
 
         if (NULL == (void *) arg) {
                 struct request *rq;
@@ -772,7 +772,9 @@ int ide_cmd_ioctl (ide_drive_t *drive, unsigned int cmd, unsigned long arg)
         if (tf->command == WIN_SETFEATURES &&
             tf->feature == SETFEATURES_XFER &&
             tf->nsect >= XFER_SW_DMA_0 &&
-            (id->dma_ultra || id->dma_mword || id->dma_1word)) {
+            (id[ATA_ID_UDMA_MODES] ||
+             id[ATA_ID_MWDMA_MODES] ||
+             id[ATA_ID_SWDMA_MODES])) {
                 xfer_rate = args[1];
                 if (tf->nsect > XFER_UDMA_2 && !eighty_ninty_three(drive)) {
                         printk(KERN_WARNING "%s: UDMA speeds >UDMA33 cannot "
diff --git a/drivers/ide/ide-timings.c b/drivers/ide/ide-timings.c
index 8c2f8327f487..d64f345f2fc0 100644
--- a/drivers/ide/ide-timings.c
+++ b/drivers/ide/ide-timings.c
@@ -78,15 +78,15 @@ EXPORT_SYMBOL_GPL(ide_timing_find_mode);
 
 u16 ide_pio_cycle_time(ide_drive_t *drive, u8 pio)
 {
-        struct hd_driveid *id = drive->id;
+        u16 *id = drive->id;
         struct ide_timing *t = ide_timing_find_mode(XFER_PIO_0 + pio);
         u16 cycle = 0;
 
-        if (id->field_valid & 2) {
-                if (id->capability & 8)
-                        cycle = id->eide_pio_iordy;
+        if (id[ATA_ID_FIELD_VALID] & 2) {
+                if (drive->driveid->capability & 8)
+                        cycle = id[ATA_ID_EIDE_PIO_IORDY];
                 else
-                        cycle = id->eide_pio;
+                        cycle = id[ATA_ID_EIDE_PIO];
 
                 /* conservative "downgrade" for all pre-ATA2 drives */
                 if (pio < 3 && cycle < t->cycle)
@@ -138,7 +138,7 @@ EXPORT_SYMBOL_GPL(ide_timing_merge);
 int ide_timing_compute(ide_drive_t *drive, u8 speed,
                        struct ide_timing *t, int T, int UT)
 {
-        struct hd_driveid *id = drive->id;
+        u16 *id = drive->id;
         struct ide_timing *s, p;
 
         /*
@@ -157,16 +157,15 @@ int ide_timing_compute(ide_drive_t *drive, u8 speed,
          * If the drive is an EIDE drive, it can tell us it needs extended
          * PIO/MWDMA cycle timing.
          */
-        if (id && id->field_valid & 2) {        /* EIDE drive */
-
+        if (id[ATA_ID_FIELD_VALID] & 2) {       /* EIDE drive */
                 memset(&p, 0, sizeof(p));
 
                 if (speed <= XFER_PIO_2)
-                        p.cycle = p.cyc8b = id->eide_pio;
+                        p.cycle = p.cyc8b = id[ATA_ID_EIDE_PIO];
                 else if (speed <= XFER_PIO_5)
-                        p.cycle = p.cyc8b = id->eide_pio_iordy;
+                        p.cycle = p.cyc8b = id[ATA_ID_EIDE_PIO_IORDY];
                 else if (speed >= XFER_MW_DMA_0 && speed <= XFER_MW_DMA_2)
-                        p.cycle = id->eide_dma_min;
+                        p.cycle = id[ATA_ID_EIDE_DMA_MIN];
 
                 ide_timing_merge(&p, t, t, IDE_TIMING_CYCLE | IDE_TIMING_CYC8B);
         }
diff --git a/drivers/ide/ide.c b/drivers/ide/ide.c
index 772451600e4d..8d3fab33a3c7 100644
--- a/drivers/ide/ide.c
+++ b/drivers/ide/ide.c
@@ -328,7 +328,7 @@ int set_using_dma(ide_drive_t *drive, int arg)
         if (arg < 0 || arg > 1)
                 return -EINVAL;
 
-        if (!drive->id || !(drive->id->capability & 1))
+        if ((drive->driveid->capability & 1) == 0)
                 goto out;
 
         if (hwif->dma_ops == NULL)
@@ -710,21 +710,21 @@ static ssize_t model_show(struct device *dev, struct device_attribute *attr,
                           char *buf)
 {
         ide_drive_t *drive = to_ide_device(dev);
-        return sprintf(buf, "%s\n", drive->id->model);
+        return sprintf(buf, "%s\n", (char *)&drive->id[ATA_ID_PROD]);
 }
 
 static ssize_t firmware_show(struct device *dev, struct device_attribute *attr,
                              char *buf)
 {
         ide_drive_t *drive = to_ide_device(dev);
-        return sprintf(buf, "%s\n", drive->id->fw_rev);
+        return sprintf(buf, "%s\n", (char *)&drive->id[ATA_ID_FW_REV]);
 }
 
 static ssize_t serial_show(struct device *dev, struct device_attribute *attr,
                            char *buf)
 {
         ide_drive_t *drive = to_ide_device(dev);
-        return sprintf(buf, "%s\n", drive->id->serial_no);
+        return sprintf(buf, "%s\n", (char *)&drive->id[ATA_ID_SERNO]);
 }
 
 static struct device_attribute ide_dev_attrs[] = {
diff --git a/drivers/ide/legacy/qd65xx.c b/drivers/ide/legacy/qd65xx.c
index 2338f344ea24..ef4e84053a81 100644
--- a/drivers/ide/legacy/qd65xx.c
+++ b/drivers/ide/legacy/qd65xx.c
@@ -151,12 +151,14 @@ static int qd_find_disk_type (ide_drive_t *drive,
                 int *active_time, int *recovery_time)
 {
         struct qd65xx_timing_s *p;
-        char model[40];
+        char *m = (char *)&drive->id[ATA_ID_PROD];
+        char model[ATA_ID_PROD_LEN];
 
-        if (!*drive->id->model) return 0;
+        if (*m == 0)
+                return 0;
 
-        strncpy(model,drive->id->model,40);
-        ide_fixstring(model,40,1); /* byte-swap */
+        strncpy(model, m, ATA_ID_PROD_LEN);
+        ide_fixstring(model, ATA_ID_PROD_LEN, 1); /* byte-swap */
 
         for (p = qd65xx_timing ; p->offset != -1 ; p++) {
                 if (!strncmp(p->model, model+p->offset, 4)) {
@@ -185,20 +187,20 @@ static void qd_set_timing (ide_drive_t *drive, u8 timing)
 
 static void qd6500_set_pio_mode(ide_drive_t *drive, const u8 pio)
 {
+        u16 *id = drive->id;
         int active_time   = 175;
         int recovery_time = 415; /* worst case values from the dos driver */
 
         /*
          * FIXME: use "pio" value
          */
-        if (drive->id && !qd_find_disk_type(drive, &active_time, &recovery_time)
-                && drive->id->tPIO && (drive->id->field_valid & 0x02)
-                && drive->id->eide_pio >= 240) {
-
+        if (!qd_find_disk_type(drive, &active_time, &recovery_time) &&
+            drive->driveid->tPIO && (id[ATA_ID_FIELD_VALID] & 2) &&
+            id[ATA_ID_EIDE_PIO] >= 240) {
                 printk(KERN_INFO "%s: PIO mode%d\n", drive->name,
-                                drive->id->tPIO);
+                                drive->driveid->tPIO);
                 active_time = 110;
-                recovery_time = drive->id->eide_pio - 120;
+                recovery_time = drive->id[ATA_ID_EIDE_PIO] - 120;
         }
 
         qd_set_timing(drive, qd6500_compute_timing(HWIF(drive), active_time, recovery_time));
diff --git a/drivers/ide/pci/alim15x3.c b/drivers/ide/pci/alim15x3.c
index d647526af557..fcc701b3c0a2 100644
--- a/drivers/ide/pci/alim15x3.c
+++ b/drivers/ide/pci/alim15x3.c
@@ -134,8 +134,8 @@ static u8 ali_udma_filter(ide_drive_t *drive)
         if (m5229_revision > 0x20 && m5229_revision < 0xC2) {
                 if (drive->media != ide_disk)
                         return 0;
-                if (chip_is_1543c_e && strstr(drive->id->model, "WDC ") &&
-                    wdc_udma == 0)
+                if (wdc_udma == 0 && chip_is_1543c_e &&
+                    strstr((char *)&drive->id[ATA_ID_PROD], "WDC "))
                         return 0;
         }
 
diff --git a/drivers/ide/pci/cs5530.c b/drivers/ide/pci/cs5530.c
index f235db8c678b..774ff58603a2 100644
--- a/drivers/ide/pci/cs5530.c
+++ b/drivers/ide/pci/cs5530.c
@@ -82,16 +82,18 @@ static u8 cs5530_udma_filter(ide_drive_t *drive)
 {
         ide_hwif_t *hwif = drive->hwif;
         ide_drive_t *mate = &hwif->drives[(drive->dn & 1) ^ 1];
-        struct hd_driveid *mateid = mate->id;
+        u16 *mateid = mate->id;
         u8 mask = hwif->ultra_mask;
 
         if (mate->present == 0)
                 goto out;
 
-        if ((mateid->capability & 1) && __ide_dma_bad_drive(mate) == 0) {
-                if ((mateid->field_valid & 4) && (mateid->dma_ultra & 7))
+        if ((mate->driveid->capability & 1) && __ide_dma_bad_drive(mate) == 0) {
+                if ((mateid[ATA_ID_FIELD_VALID] & 4) &&
+                    (mateid[ATA_ID_UDMA_MODES] & 7))
                         goto out;
-                if ((mateid->field_valid & 2) && (mateid->dma_mword & 7))
+                if ((mateid[ATA_ID_FIELD_VALID] & 2) &&
+                    (mateid[ATA_ID_MWDMA_MODES] & 7))
                         mask = 0;
         }
 out:
diff --git a/drivers/ide/pci/hpt366.c b/drivers/ide/pci/hpt366.c
index c37ab1743819..b7f77fd3cb6e 100644
--- a/drivers/ide/pci/hpt366.c
+++ b/drivers/ide/pci/hpt366.c
@@ -605,10 +605,10 @@ static const struct hpt_info hpt371n __devinitdata = {
 
 static int check_in_drive_list(ide_drive_t *drive, const char **list)
 {
-        struct hd_driveid *id = drive->id;
+        char *m = (char *)&drive->id[ATA_ID_PROD];
 
         while (*list)
-                if (!strcmp(*list++,id->model))
+                if (!strcmp(*list++, m))
                         return 1;
         return 0;
 }
@@ -731,11 +731,11 @@ static void hpt3xx_set_pio_mode(ide_drive_t *drive, const u8 pio)
 
 static void hpt3xx_quirkproc(ide_drive_t *drive)
 {
-        struct hd_driveid *id   = drive->id;
+        char *m                 = (char *)&drive->id[ATA_ID_PROD];
         const  char **list      = quirk_drives;
 
         while (*list)
-                if (strstr(id->model, *list++)) {
+                if (strstr(m, *list++)) {
                         drive->quirk_list = 1;
                         return;
                 }
diff --git a/drivers/ide/pci/it821x.c b/drivers/ide/pci/it821x.c
index 4a1508a707cc..31d4e6aef1b8 100644
--- a/drivers/ide/pci/it821x.c
+++ b/drivers/ide/pci/it821x.c
@@ -446,8 +446,7 @@ static u8 it821x_cable_detect(ide_hwif_t *hwif)
 static void it821x_quirkproc(ide_drive_t *drive)
 {
         struct it821x_dev *itdev = ide_get_hwifdata(drive->hwif);
-        struct hd_driveid *id = drive->id;
-        u16 *idbits = (u16 *)drive->id;
+        u16 *id = drive->id;
 
         if (!itdev->smart) {
                 /*
@@ -466,36 +465,36 @@ static void it821x_quirkproc(ide_drive_t *drive)
          */
 
                 /* Check for RAID v native */
-                if(strstr(id->model, "Integrated Technology Express")) {
+                if (strstr((char *)&id[ATA_ID_PROD],
+                           "Integrated Technology Express")) {
                         /* In raid mode the ident block is slightly buggy
                            We need to set the bits so that the IDE layer knows
                            LBA28. LBA48 and DMA ar valid */
-                        id->capability |= 3;            /* LBA28, DMA */
-                        id->command_set_2 |= 0x0400;    /* LBA48 valid */
-                        id->cfs_enable_2 |= 0x0400;     /* LBA48 on */
+                        drive->driveid->capability |= 3;      /* LBA28, DMA */
+                        id[ATA_ID_COMMAND_SET_2] |= 0x0400;   /* LBA48 valid */
+                        id[ATA_ID_CFS_ENABLE_2]  |= 0x0400;   /* LBA48 on */
                         /* Reporting logic */
                         printk(KERN_INFO "%s: IT8212 %sRAID %d volume",
-                                drive->name,
-                                idbits[147] ? "Bootable ":"",
-                                idbits[129]);
-                                if(idbits[129] != 1)
-                                        printk("(%dK stripe)", idbits[146]);
-                                printk(".\n");
+                                drive->name, id[147] ? "Bootable " : "",
+                                id[ATA_ID_CSFO]);
+                        if (id[ATA_ID_CSFO] != 1)
+                                printk(KERN_CONT "(%dK stripe)", id[146]);
+                        printk(KERN_CONT ".\n");
                 } else {
                         /* Non RAID volume. Fixups to stop the core code
                            doing unsupported things */
-                        id->field_valid &= 3;
-                        id->queue_depth = 0;
-                        id->command_set_1 = 0;
-                        id->command_set_2 &= 0xC400;
-                        id->cfsse &= 0xC000;
-                        id->cfs_enable_1 = 0;
-                        id->cfs_enable_2 &= 0xC400;
-                        id->csf_default &= 0xC000;
-                        id->word127 = 0;
-                        id->dlf = 0;
-                        id->csfo = 0;
-                        id->cfa_power = 0;
+                        id[ATA_ID_FIELD_VALID]   &= 3;
+                        id[ATA_ID_QUEUE_DEPTH]    = 0;
+                        id[ATA_ID_COMMAND_SET_1]  = 0;
+                        id[ATA_ID_COMMAND_SET_2] &= 0xC400;
+                        id[ATA_ID_CFSSE]         &= 0xC000;
+                        id[ATA_ID_CFS_ENABLE_1]   = 0;
+                        id[ATA_ID_CFS_ENABLE_2]  &= 0xC400;
+                        id[ATA_ID_CSF_DEFAULT]   &= 0xC000;
+                        id[127]                   = 0;
+                        id[ATA_ID_DLF]            = 0;
+                        id[ATA_ID_CSFO]           = 0;
+                        id[ATA_ID_CFA_POWER]      = 0;
                         printk(KERN_INFO "%s: Performing identify fixups.\n",
                                 drive->name);
                 }
@@ -505,8 +504,8 @@ static void it821x_quirkproc(ide_drive_t *drive)
                  * IDE core that DMA is supported (it821x hardware
                  * takes care of DMA mode programming).
                  */
-                if (id->capability & 1) {
-                        id->dma_mword |= 0x0101;
+                if (drive->driveid->capability & 1) {
+                        id[ATA_ID_MWDMA_MODES] |= 0x0101;
                         drive->current_speed = XFER_MW_DMA_0;
                 }
         }
diff --git a/drivers/ide/pci/pdc202xx_new.c b/drivers/ide/pci/pdc202xx_new.c
index d477da6b5858..7ecfcd06f47e 100644
--- a/drivers/ide/pci/pdc202xx_new.c
+++ b/drivers/ide/pci/pdc202xx_new.c
@@ -203,10 +203,10 @@ static u8 pdcnew_cable_detect(ide_hwif_t *hwif)
 
 static void pdcnew_quirkproc(ide_drive_t *drive)
 {
-        const char **list, *model = drive->id->model;
+        const char **list, *m = (char *)&drive->id[ATA_ID_PROD];
 
         for (list = pdc_quirk_drives; *list != NULL; list++)
-                if (strstr(model, *list) != NULL) {
+                if (strstr(m, *list) != NULL) {
                         drive->quirk_list = 2;
                         return;
                 }
diff --git a/drivers/ide/pci/pdc202xx_old.c b/drivers/ide/pci/pdc202xx_old.c
index de9a27400462..23e861b177ce 100644
--- a/drivers/ide/pci/pdc202xx_old.c
+++ b/drivers/ide/pci/pdc202xx_old.c
@@ -86,7 +86,7 @@ static void pdc202xx_set_mode(ide_drive_t *drive, const u8 speed)
                  * Prefetch_EN / IORDY_EN / PA[3:0] bits of register A
                  */
                 AP &= ~0x3f;
-                if (drive->id->capability & 4)
+                if (drive->driveid->capability & 4)
                         AP |= 0x20;     /* set IORDY_EN bit */
                 if (drive->media == ide_disk)
                         AP |= 0x10;     /* set Prefetch_EN bit */
@@ -154,10 +154,10 @@ static void pdc_old_disable_66MHz_clock(ide_hwif_t *hwif)
 
 static void pdc202xx_quirkproc(ide_drive_t *drive)
 {
-        const char **list, *model = drive->id->model;
+        const char **list, *m = (char *)&drive->id[ATA_ID_PROD];
 
         for (list = pdc_quirk_drives; *list != NULL; list++)
-                if (strstr(model, *list) != NULL) {
+                if (strstr(m, *list) != NULL) {
                         drive->quirk_list = 2;
                         return;
                 }
diff --git a/drivers/ide/pci/sc1200.c b/drivers/ide/pci/sc1200.c
index 8efaed16fea3..5c8367df14e4 100644
--- a/drivers/ide/pci/sc1200.c
+++ b/drivers/ide/pci/sc1200.c
@@ -105,16 +105,18 @@ static u8 sc1200_udma_filter(ide_drive_t *drive)
 {
         ide_hwif_t *hwif = drive->hwif;
         ide_drive_t *mate = &hwif->drives[(drive->dn & 1) ^ 1];
-        struct hd_driveid *mateid = mate->id;
+        u16 *mateid = mate->id;
         u8 mask = hwif->ultra_mask;
 
         if (mate->present == 0)
                 goto out;
 
-        if ((mateid->capability & 1) && __ide_dma_bad_drive(mate) == 0) {
-                if ((mateid->field_valid & 4) && (mateid->dma_ultra & 7))
+        if ((mate->driveid->capability & 1) && __ide_dma_bad_drive(mate) == 0) {
+                if ((mateid[ATA_ID_FIELD_VALID] & 4) &&
+                    (mateid[ATA_ID_UDMA_MODES] & 7))
                         goto out;
-                if ((mateid->field_valid & 2) && (mateid->dma_mword & 7))
+                if ((mateid[ATA_ID_FIELD_VALID] & 2) &&
+                    (mateid[ATA_ID_MWDMA_MODES] & 7))
                         mask = 0;
         }
 out:
diff --git a/drivers/ide/pci/serverworks.c b/drivers/ide/pci/serverworks.c
index c3bdc6e51a48..ded6a13fd406 100644
--- a/drivers/ide/pci/serverworks.c
+++ b/drivers/ide/pci/serverworks.c
@@ -57,8 +57,10 @@ static struct pci_dev *isa_dev;
 
 static int check_in_drive_lists (ide_drive_t *drive, const char **list)
 {
+        char *m = (char *)&drive->id[ATA_ID_PROD];
+
         while (*list)
-                if (!strcmp(*list++, drive->id->model))
+                if (!strcmp(*list++, m))
                         return 1;
         return 0;
 }
diff --git a/drivers/ide/pci/siimage.c b/drivers/ide/pci/siimage.c
index db2b88a369ab..7b5bd8729f64 100644
--- a/drivers/ide/pci/siimage.c
+++ b/drivers/ide/pci/siimage.c
@@ -223,7 +223,9 @@ static u8 sil_pata_udma_filter(ide_drive_t *drive)
 
 static u8 sil_sata_udma_filter(ide_drive_t *drive)
 {
-        return strstr(drive->id->model, "Maxtor") ? ATA_UDMA5 : ATA_UDMA6;
+        char *m = (char *)&drive->id[ATA_ID_PROD];
+
+        return strstr(m, "Maxtor") ? ATA_UDMA5 : ATA_UDMA6;
 }
 
 /**
@@ -616,8 +618,8 @@ static void __devinit init_mmio_iops_siimage(ide_hwif_t *hwif)
 
 static int is_dev_seagate_sata(ide_drive_t *drive)
 {
-        const char *s   = &drive->id->model[0];
-        unsigned len    = strnlen(s, sizeof(drive->id->model));
+        const char *s   = (const char *)&drive->id[ATA_ID_PROD];
+        unsigned len    = strnlen(s, ATA_ID_PROD_LEN);
 
         if ((len > 4) && (!memcmp(s, "ST", 2)))
                 if ((!memcmp(s + len - 2, "AS", 2)) ||
diff --git a/drivers/ide/ppc/pmac.c b/drivers/ide/ppc/pmac.c
index fa2be26272d5..c3432da78d52 100644
--- a/drivers/ide/ppc/pmac.c
+++ b/drivers/ide/ppc/pmac.c
@@ -669,9 +669,9 @@ static void
 set_timings_mdma(ide_drive_t *drive, int intf_type, u32 *timings, u32 *timings2,
                         u8 speed)
 {
+        u16 *id = drive->id;
         int cycleTime, accessTime = 0, recTime = 0;
         unsigned accessTicks, recTicks;
-        struct hd_driveid *id = drive->id;
         struct mdma_timings_t* tm = NULL;
         int i;
 
@@ -686,8 +686,8 @@ set_timings_mdma(ide_drive_t *drive, int intf_type, u32 *timings, u32 *timings2,
         }
 
         /* Check if drive provides explicit DMA cycle time */
-        if ((id->field_valid & 2) && id->eide_dma_time)
-                cycleTime = max_t(int, id->eide_dma_time, cycleTime);
+        if ((id[ATA_ID_FIELD_VALID] & 2) && id[ATA_ID_EIDE_DMA_TIME])
+                cycleTime = max_t(int, id[ATA_ID_EIDE_DMA_TIME], cycleTime);
 
         /* OHare limits according to some old Apple sources */  
         if ((intf_type == controller_ohare) && (cycleTime < 150))
diff --git a/drivers/scsi/ide-scsi.c b/drivers/scsi/ide-scsi.c
index 81c16cba5417..b1b506f31be8 100644
--- a/drivers/scsi/ide-scsi.c
+++ b/drivers/scsi/ide-scsi.c
@@ -452,7 +452,7 @@ static inline void idescsi_add_settings(ide_drive_t *drive) { ; }
  */
 static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi)
 {
-        if (drive->id && (drive->id->config & 0x0060) == 0x20)
+        if ((drive->id[ATA_ID_CONFIG] & 0x0060) == 0x20)
                 set_bit(IDE_AFLAG_DRQ_INTERRUPT, &drive->atapi_flags);
         clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 #if IDESCSI_DEBUG_LOG
@@ -811,6 +811,7 @@ static int ide_scsi_probe(ide_drive_t *drive)
         struct gendisk *g;
         static int warned;
         int err = -ENOMEM;
+        u16 last_lun;
 
         if (!warned && drive->media == ide_cdrom) {
                 printk(KERN_WARNING "ide-scsi is deprecated for cd burning! Use ide-cd and give dev=/dev/hdX as device\n");
@@ -836,12 +837,12 @@ static int ide_scsi_probe(ide_drive_t *drive)
 
         host->max_id = 1;
 
-        if (drive->id->last_lun)
-                debug_log("%s: id->last_lun=%u\n", drive->name,
-                          drive->id->last_lun);
+        last_lun = drive->id[ATA_ID_LAST_LUN];
+        if (last_lun)
+                debug_log("%s: last_lun=%u\n", drive->name, last_lun);
 
-        if ((drive->id->last_lun & 0x7) != 7)
-                host->max_lun = (drive->id->last_lun & 0x7) + 1;
+        if ((last_lun & 7) != 7)
+                host->max_lun = (last_lun & 7) + 1;
         else
                 host->max_lun = 1;
 
diff --git a/include/linux/ide.h b/include/linux/ide.h
index 6514db8fd2e4..0c85aff3edf1 100644
--- a/include/linux/ide.h
+++ b/include/linux/ide.h
@@ -380,7 +380,11 @@ struct ide_drive_s {
         struct request          *rq;    /* current request */
         struct ide_drive_s      *next;  /* circular list of hwgroup drives */
         void            *driver_data;   /* extra driver data */
-        struct hd_driveid       *id;    /* drive model identification info */
+        union {
+                /* identification info */
+                struct hd_driveid       *driveid;
+                u16                     *id;
+        };
 #ifdef CONFIG_IDE_PROC_FS
         struct proc_dir_entry *proc;    /* /proc/ide/ directory entry */
         struct ide_settings_s *settings;/* /proc/ide/ drive settings */
@@ -920,7 +924,7 @@ ide_startstop_t __ide_error(ide_drive_t *, struct request *, u8, u8);
 
 ide_startstop_t ide_error (ide_drive_t *drive, const char *msg, byte stat);
 
-extern void ide_fix_driveid(struct hd_driveid *);
+void ide_fix_driveid(u16 *);
 
 extern void ide_fixstring(u8 *, const int, const int);
 
@@ -1240,7 +1244,7 @@ struct drive_list_entry {
         const char *id_firmware;
 };
 
-int ide_in_drive_list(struct hd_driveid *, const struct drive_list_entry *);
+int ide_in_drive_list(u16 *, const struct drive_list_entry *);
 
 #ifdef CONFIG_BLK_DEV_IDEDMA
 int __ide_dma_bad_drive(ide_drive_t *);
@@ -1347,12 +1351,13 @@ const char *ide_xfer_verbose(u8 mode);
 extern void ide_toggle_bounce(ide_drive_t *drive, int on);
 extern int ide_set_xfer_rate(ide_drive_t *drive, u8 rate);
 
-static inline int ide_dev_has_iordy(struct hd_driveid *id)
+static inline int ide_dev_has_iordy(u16 *id)
 {
-        return ((id->field_valid & 2) && (id->capability & 8)) ? 1 : 0;
+        return ((id[ATA_ID_FIELD_VALID] & 2) &&
+                (((struct hd_driveid *)id)->capability & 8)) ? 1 : 0;
 }
 
-static inline int ide_dev_is_sata(struct hd_driveid *id)
+static inline int ide_dev_is_sata(u16 *id)
 {
         /*
          * See if word 93 is 0 AND drive is at least ATA-5 compatible
@@ -1360,7 +1365,7 @@ static inline int ide_dev_is_sata(struct hd_driveid *id)
          * this trick allows us to filter out the reserved values of
          * 0x0000 and 0xffff along with the earlier ATA revisions...
          */
-        if (id->hw_config == 0 && (short)id->major_rev_num >= 0x0020)
+        if (id[ATA_ID_HW_CONFIG] == 0 && (short)id[ATA_ID_MAJOR_VER] >= 0x0020)
                 return 1;
         return 0;
 }
@@ -1437,11 +1442,11 @@ extern struct bus_type ide_bus_type;
 extern struct class *ide_port_class;
 
 /* check if CACHE FLUSH (EXT) command is supported (bits defined in ATA-6) */
-#define ide_id_has_flush_cache(id)      ((id)->cfs_enable_2 & 0x3000)
+#define ide_id_has_flush_cache(id)      ((id)[ATA_ID_CFS_ENABLE_2] & 0x3000)
 
 /* some Maxtor disks have bit 13 defined incorrectly so check bit 10 too */
 #define ide_id_has_flush_cache_ext(id)  \
-        (((id)->cfs_enable_2 & 0x2400) == 0x2400)
+        (((id)[ATA_ID_CFS_ENABLE_2] & 0x2400) == 0x2400)
 
 static inline void ide_dump_identify(u8 *id)
 {