ide: remove 'handler' field from ide_task_t (take 2)

* Add IDE_TFLAG_CUSTOM_HANDLER taskfile flag and use it for internal requests
  which require custom handlers.  Check the flag in do_rw_taskfile() and set
  handler accordingly.

* Cleanup ide_init_{specify,restore,setmult}_cmd() and rename it to
  ide_tf_set_{specify,restore,setmult}_cmd().

* Make {set_geometry,recal,set_multmode}_intr() static.

* Remove no longer needed 'handler' field from ide_task_t.

v2:
* 'handler' in do_rw_taskfile() must be set to NULL initially.

There should be no functionality changes caused by this patch.

Acked-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
diff --git a/include/linux/ide.h b/include/linux/ide.h
index 5d675f1..721c9d8 100644
--- a/include/linux/ide.h
+++ b/include/linux/ide.h
@@ -911,6 +911,7 @@
 	IDE_TFLAG_WRITE			= (1 << 15),
 	IDE_TFLAG_FLAGGED_SET_IN_FLAGS	= (1 << 16),
 	IDE_TFLAG_IN_DATA		= (1 << 17),
+	IDE_TFLAG_CUSTOM_HANDLER	= (1 << 18),
 };
 
 struct ide_taskfile {
@@ -949,7 +950,6 @@
 	};
 	u32			tf_flags;
 	int			data_phase;
-	ide_handler_t		*handler;
 	struct request		*rq;		/* copy of request */
 	void			*special;	/* valid_t generally */
 } ide_task_t;
@@ -970,9 +970,6 @@
  */
 extern ide_startstop_t do_rw_taskfile(ide_drive_t *, ide_task_t *);
 
-extern ide_startstop_t set_multmode_intr(ide_drive_t *);
-extern ide_startstop_t set_geometry_intr(ide_drive_t *);
-extern ide_startstop_t recal_intr(ide_drive_t *);
 extern ide_startstop_t task_in_intr(ide_drive_t *);
 extern ide_startstop_t pre_task_out_intr(ide_drive_t *, struct request *);