[ide] fix build for built-in hpt366 and modular ide-disk

* always call __ide_do_rw_disk() in ide_do_rw_disk()
* modify ide_hwif_t->rw_disk hook accordingly
* update and cleanup hpt372n_rw_disk()
  (the only user of ide_hwif_t->rw_disk hook)
* make __ide_do_rw_disk() static + fix comment
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

drivers/ide/ide-disk.c

@@ -119,9 +119,8 @@ static int lba_capacity_is_ok (struct hd_driveid *id)
 /*
  * __ide_do_rw_disk() issues READ and WRITE commands to a disk,
  * using LBA if supported, or CHS otherwise, to address sectors.
- * It also takes care of issuing special DRIVE_CMDs.
  */
-ide_startstop_t __ide_do_rw_disk (ide_drive_t *drive, struct request *rq, sector_t block)
+static ide_startstop_t __ide_do_rw_disk(ide_drive_t *drive, struct request *rq, sector_t block)
 {
 	ide_hwif_t *hwif	= HWIF(drive);
 	unsigned int dma	= drive->using_dma;
@@ -256,7 +255,6 @@ ide_startstop_t __ide_do_rw_disk (ide_drive_t *drive, struct request *rq, sector
 		return pre_task_out_intr(drive, rq);
 	}
 }
-EXPORT_SYMBOL_GPL(__ide_do_rw_disk);
 
 /*
  * 268435455  == 137439 MB or 28bit limit
@@ -281,9 +279,9 @@ static ide_startstop_t ide_do_rw_disk (ide_drive_t *drive, struct request *rq, s
 		 block, rq->nr_sectors, (unsigned long)rq->buffer);
 
 	if (hwif->rw_disk)
-		return hwif->rw_disk(drive, rq, block);
-	else
-		return __ide_do_rw_disk(drive, rq, block);
+		hwif->rw_disk(drive, rq);
+
+	return __ide_do_rw_disk(drive, rq, block);
 }
 
 /*

drivers/ide/pci/hpt366.c

@@ -1018,32 +1018,25 @@ static void hpt372n_set_clock(ide_drive_t *drive, int mode)
 }
 
 /**
- *	hpt372n_rw_disk		-	wrapper for I/O
+ *	hpt372n_rw_disk		-	prepare for I/O
  *	@drive: drive for command
  *	@rq: block request structure
- *	@block: block number
- *
- *	This is called when a disk I/O is issued to the 372N instead
- *	of the default functionality. We need it because of the clock
- *	switching
  *
+ *	This is called when a disk I/O is issued to the 372N.
+ *	We need it because of the clock switching.
  */
- 
-static ide_startstop_t hpt372n_rw_disk(ide_drive_t *drive, struct request *rq, sector_t block)
+
+static void hpt372n_rw_disk(ide_drive_t *drive, struct request *rq)
 {
+	ide_hwif_t *hwif = drive->hwif;
 	int wantclock;
-	
-	if(rq_data_dir(rq) == READ)
-		wantclock = 0x21;
-	else
-		wantclock = 0x23;
-		
-	if(HWIF(drive)->config_data != wantclock)
-	{
+
+	wantclock = rq_data_dir(rq) ? 0x23 : 0x21;
+
+	if (hwif->config_data != wantclock) {
 		hpt372n_set_clock(drive, wantclock);
-		HWIF(drive)->config_data = wantclock;
+		hwif->config_data = wantclock;
 	}
-	return __ide_do_rw_disk(drive, rq, block);
 }
 
 /*

include/linux/ide.h

@@ -797,7 +797,7 @@ typedef struct hwif_s {
 	struct pci_dev  *pci_dev;	/* for pci chipsets */
 	struct ide_pci_device_s	*cds;	/* chipset device struct */
 
-	ide_startstop_t (*rw_disk)(ide_drive_t *, struct request *, sector_t);
+	void (*rw_disk)(ide_drive_t *, struct request *);
 
 #if 0
 	ide_hwif_ops_t	*hwifops;
@@ -1318,7 +1318,6 @@ extern int set_transfer(ide_drive_t *, ide_task_t *);
 extern int taskfile_lib_get_identify(ide_drive_t *drive, u8 *);
 
 extern int ide_wait_not_busy(ide_hwif_t *hwif, unsigned long timeout);
-ide_startstop_t __ide_do_rw_disk(ide_drive_t *drive, struct request *rq, sector_t block);
 
 /*
  * ide_stall_queue() can be used by a drive to give excess bandwidth back