ide: use ide_complete_cmd() for REQ_UNPARK_HEADS

* Fixup ->tf_flags in ide_do_park_unpark() to match their current use.

* Use ide_complete_cmd() for REQ_UNPARK_HEADS.

While at it:

* No need to read Error register for PM requests in task_no_data_intr().
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

drivers/ide/ide-park.c

@@ -74,11 +74,11 @@ ide_startstop_t ide_do_park_unpark(ide_drive_t *drive, struct request *rq)
 		tf->lbal = 0x4c;
 		tf->lbam = 0x4e;
 		tf->lbah = 0x55;
-		cmd.tf_flags |= IDE_TFLAG_CUSTOM_HANDLER;
+		cmd.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE;
 	} else		/* cmd == REQ_UNPARK_HEADS */
 		tf->command = ATA_CMD_CHK_POWER;
 
-	cmd.tf_flags |= IDE_TFLAG_TF | IDE_TFLAG_DEVICE;
+	cmd.tf_flags |= IDE_TFLAG_CUSTOM_HANDLER;
 	cmd.protocol = ATA_PROT_NODATA;
 
 	cmd.rq = rq;

drivers/ide/ide-taskfile.c

@@ -149,16 +149,16 @@ static ide_startstop_t task_no_data_intr(ide_drive_t *drive)
 	if (custom && tf->command == ATA_CMD_SET_MULTI)
 		drive->mult_count = drive->mult_req;
 
-	if (custom == 0 || tf->command == ATA_CMD_IDLEIMMEDIATE) {
+	if (custom == 0 || tf->command == ATA_CMD_IDLEIMMEDIATE ||
+	    tf->command == ATA_CMD_CHK_POWER) {
 		struct request *rq = hwif->rq;
-		u8 err = ide_read_error(drive);
 
 		if (blk_pm_request(rq))
 			ide_complete_pm_rq(drive, rq);
 		else {
-			if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE ||
-			    tf->command == ATA_CMD_IDLEIMMEDIATE)
-				ide_complete_cmd(drive, cmd, stat, err);
+			u8 err = ide_read_error(drive);
+
+			ide_complete_cmd(drive, cmd, stat, err);
 			ide_complete_rq(drive, err);
 		}
 	}