ide: dynamic allocation of device structures

Allocate device structures dynamically instead of having them embedded
in ide_hwif_t:

* Remove needless zeroing of port structure from ide_init_port_data().

* Add ide_hwif_t.devices[MAX_DRIVES] (table of pointers to the devices).

* Add ide_port_{alloc,free}_devices() helpers and use them respectively
  in ide_{host,free}_alloc().

* Convert all users of ->drives[] to use ->devices[] instead.

While at it:

* Use drive->dn for the slave device check in scc_pata.c.

As a nice side-effect this patch cuts ~1kB (x86-32) from the resulting
code size:

   text    data     bss     dec     hex filename
  53963    1244     237   55444    d894 drivers/ide/ide-core.o.before
  52981    1244     237   54462    d4be drivers/ide/ide-core.o.after

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

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/ide/ide-iops.c b/drivers/ide/ide-iops.c
index 1bcb9484f49e..26b58d15c4e6 100644
--- a/drivers/ide/ide-iops.c
+++ b/drivers/ide/ide-iops.c
@@ -1111,7 +1111,7 @@ static ide_startstop_t do_reset1 (ide_drive_t *drive, int do_not_try_atapi)
                 prepare_to_wait(&ide_park_wq, &wait, TASK_UNINTERRUPTIBLE);
                 timeout = jiffies;
                 for (unit = 0; unit < MAX_DRIVES; unit++) {
-                        ide_drive_t *tdrive = &hwif->drives[unit];
+                        ide_drive_t *tdrive = hwif->devices[unit];
 
                         if (tdrive->dev_flags & IDE_DFLAG_PRESENT &&
                             tdrive->dev_flags & IDE_DFLAG_PARKED &&
@@ -1134,7 +1134,7 @@ static ide_startstop_t do_reset1 (ide_drive_t *drive, int do_not_try_atapi)
          * for any of the drives on this interface.
          */
         for (unit = 0; unit < MAX_DRIVES; ++unit)
-                pre_reset(&hwif->drives[unit]);
+                pre_reset(hwif->devices[unit]);
 
         if (io_ports->ctl_addr == 0) {
                 spin_unlock_irqrestore(&hwif->lock, flags);