ide: convert do_rw_taskfile() to use ->data_phase

* Use task->data_phase in do_rw_taskfile() to decide what to do.

* task->prehandler is only used by TASKFILE[_MULTI]_OUT so just
  use pre_task_out_intr() directly and remove no longer needed
  'prehandler' field from ide_task_t.

* Remove no longer needed ide_pre_handler_t type.

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>

1 files changed, 13 insertions, 12 deletions

diff --git a/drivers/ide/ide-taskfile.c b/drivers/ide/ide-taskfile.c
index 1a34edb183ec..5f6d01a4222c 100644
--- a/drivers/ide/ide-taskfile.c
+++ b/drivers/ide/ide-taskfile.c
@@ -170,23 +170,25 @@ ide_startstop_t do_rw_taskfile (ide_drive_t *drive, ide_task_t *task)
 
         ide_tf_load(drive, task);
 
-        if (task->handler != NULL) {
-                if (task->prehandler != NULL) {
-                        hwif->OUTBSYNC(drive, tf->command, IDE_COMMAND_REG);
-                        ndelay(400);    /* FIXME */
-                        return task->prehandler(drive, task->rq);
-                }
+        switch (task->data_phase) {
+        case TASKFILE_MULTI_OUT:
+        case TASKFILE_OUT:
+                hwif->OUTBSYNC(drive, tf->command, IDE_COMMAND_REG);
+                ndelay(400);    /* FIXME */
+                return pre_task_out_intr(drive, task->rq);
+        case TASKFILE_MULTI_IN:
+        case TASKFILE_IN:
+        case TASKFILE_NO_DATA:
                 ide_execute_command(drive, tf->command, task->handler, WAIT_WORSTCASE, NULL);
                 return ide_started;
-        }
-
-        if (task_dma_ok(task) && drive->using_dma && !hwif->dma_setup(drive)) {
+        default:
+                if (task_dma_ok(task) == 0 || drive->using_dma == 0 ||
+                    hwif->dma_setup(drive))
+                        return ide_stopped;
                 hwif->dma_exec_cmd(drive, tf->command);
                 hwif->dma_start(drive);
                 return ide_started;
         }
-
-        return ide_stopped;
 }
 
 /*
@@ -665,7 +667,6 @@ int ide_taskfile_ioctl (ide_drive_t *drive, unsigned int cmd, unsigned long arg)
                         }
                         /* fall through */
                 case TASKFILE_OUT:
-                        args.prehandler = &pre_task_out_intr;
                         args.handler = &task_out_intr;
                         /* fall through */
                 case TASKFILE_OUT_DMAQ: