ide: add ->pc_{update,io}_buffers methods

Add ->pc_{update,io}_buffers methods to ide_drive_t and use
them instead of {update,io}_buffers ide_pc_intr() arguments.

There should be no functional changes caused by this patch.

Cc: Borislav Petkov <petkovbb@gmail.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

drivers/ide/ide-atapi.c

@@ -246,10 +246,7 @@ int ide_scsi_expiry(ide_drive_t *drive)
 }
 EXPORT_SYMBOL_GPL(ide_scsi_expiry);
 
-/* TODO: unify the code thus making some arguments go away */
-ide_startstop_t ide_pc_intr(ide_drive_t *drive, ide_handler_t *handler,
-	void (*update_buffers)(ide_drive_t *, struct ide_atapi_pc *),
-	int (*io_buffers)(ide_drive_t *, struct ide_atapi_pc *, unsigned, int))
+ide_startstop_t ide_pc_intr(ide_drive_t *drive, ide_handler_t *handler)
 {
 	struct ide_atapi_pc *pc = drive->pc;
 	ide_hwif_t *hwif = drive->hwif;
@@ -290,8 +287,8 @@ ide_startstop_t ide_pc_intr(ide_drive_t *drive, ide_handler_t *handler,
 			pc->flags |= PC_FLAG_DMA_ERROR;
 		} else {
 			pc->xferred = pc->req_xfer;
-			if (update_buffers)
-				update_buffers(drive, pc);
+			if (drive->pc_update_buffers)
+				drive->pc_update_buffers(drive, pc);
 		}
 		debug_log("%s: DMA finished\n", drive->name);
 	}
@@ -386,7 +383,8 @@ ide_startstop_t ide_pc_intr(ide_drive_t *drive, ide_handler_t *handler,
 					temp = 0;
 				if (temp) {
 					if (pc->sg)
-						io_buffers(drive, pc, temp, 0);
+						drive->pc_io_buffers(drive, pc,
+								     temp, 0);
 					else
 						tp_ops->input_data(drive, NULL,
 							pc->cur_pos, temp);
@@ -410,7 +408,7 @@ ide_startstop_t ide_pc_intr(ide_drive_t *drive, ide_handler_t *handler,
 	if ((drive->media == ide_floppy && !scsi && !pc->buf) ||
 	    (drive->media == ide_tape && !scsi && pc->bh) ||
 	    (scsi && pc->sg)) {
-		int done = io_buffers(drive, pc, bcount,
+		int done = drive->pc_io_buffers(drive, pc, bcount,
 				  !!(pc->flags & PC_FLAG_WRITING));
 
 		/* FIXME: don't do partial completions */

drivers/ide/ide-floppy.c

@@ -196,8 +196,7 @@ static void ide_floppy_callback(ide_drive_t *drive, int dsc)
 /* The usual interrupt handler called during a packet command. */
 static ide_startstop_t idefloppy_pc_intr(ide_drive_t *drive)
 {
-	return ide_pc_intr(drive, idefloppy_pc_intr, idefloppy_update_buffers,
-			   ide_io_buffers);
+	return ide_pc_intr(drive, idefloppy_pc_intr);
 }
 
 /*
@@ -636,7 +635,9 @@ static void idefloppy_setup(ide_drive_t *drive, idefloppy_floppy_t *floppy)
 
 	*((u16 *)&gcw) = id[ATA_ID_CONFIG];
 
-	drive->pc_callback = ide_floppy_callback;
+	drive->pc_callback	 = ide_floppy_callback;
+	drive->pc_update_buffers = idefloppy_update_buffers;
+	drive->pc_io_buffers	 = ide_io_buffers;
 
 	if (((gcw[0] & 0x60) >> 5) == 1)
 		drive->atapi_flags |= IDE_AFLAG_DRQ_INTERRUPT;

drivers/ide/ide-tape.c

@@ -627,8 +627,7 @@ static int ide_tape_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
  */
 static ide_startstop_t idetape_pc_intr(ide_drive_t *drive)
 {
-	return ide_pc_intr(drive, idetape_pc_intr, idetape_update_buffers,
-			   ide_tape_io_buffers);
+	return ide_pc_intr(drive, idetape_pc_intr);
 }
 
 /*
@@ -2211,7 +2210,9 @@ static void idetape_setup(ide_drive_t *drive, idetape_tape_t *tape, int minor)
 	u8 gcw[2];
 	u16 *ctl = (u16 *)&tape->caps[12];
 
-	drive->pc_callback = ide_tape_callback;
+	drive->pc_callback	 = ide_tape_callback;
+	drive->pc_update_buffers = idetape_update_buffers;
+	drive->pc_io_buffers	 = ide_tape_io_buffers;
 
 	spin_lock_init(&tape->lock);
 	drive->dsc_overlap = 1;

drivers/scsi/ide-scsi.c

@@ -275,7 +275,7 @@ static int idescsi_end_request (ide_drive_t *drive, int uptodate, int nrsecs)
  */
 static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive)
 {
-	return ide_pc_intr(drive, idescsi_pc_intr, NULL, ide_io_buffers);
+	return ide_pc_intr(drive, idescsi_pc_intr);
 }
 
 static ide_startstop_t idescsi_transfer_pc(ide_drive_t *drive)
@@ -407,7 +407,9 @@ static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi)
 	set_bit(IDESCSI_LOG_CMD, &scsi->log);
 #endif /* IDESCSI_DEBUG_LOG */
 
-	drive->pc_callback = ide_scsi_callback;
+	drive->pc_callback	 = ide_scsi_callback;
+	drive->pc_update_buffers = NULL;
+	drive->pc_io_buffers	 = ide_io_buffers;
 
 	ide_proc_register_driver(drive, scsi->driver);
 }

include/linux/ide.h

@@ -555,6 +555,10 @@ struct ide_drive_s {
 	/* callback for packet commands */
 	void (*pc_callback)(struct ide_drive_s *, int);
 
+	void (*pc_update_buffers)(struct ide_drive_s *, struct ide_atapi_pc *);
+	int  (*pc_io_buffers)(struct ide_drive_s *, struct ide_atapi_pc *,
+			      unsigned int, int);
+
 	unsigned long atapi_flags;
 
 	struct ide_atapi_pc request_sense_pc;
@@ -1184,10 +1188,7 @@ static inline unsigned long ide_scsi_get_timeout(struct ide_atapi_pc *pc)
 
 int ide_scsi_expiry(ide_drive_t *);
 
-ide_startstop_t ide_pc_intr(ide_drive_t *drive, ide_handler_t *handler,
-	void (*update_buffers)(ide_drive_t *, struct ide_atapi_pc *),
-	int (*io_buffers)(ide_drive_t *, struct ide_atapi_pc *, unsigned int,
-			   int));
+ide_startstop_t ide_pc_intr(ide_drive_t *drive, ide_handler_t *handler);
 ide_startstop_t ide_transfer_pc(ide_drive_t *,
 				ide_handler_t *, unsigned int, ide_expiry_t *);
 ide_startstop_t ide_issue_pc(ide_drive_t *,