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>

1 files changed, 33 insertions, 30 deletions

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);