[PATCH] convert IDE device drivers to driver-model

* add ide_bus_match() and export ide_bus_type
* split ide_remove_driver_from_hwgroup() out of ide_unregister()
* move device cleanup from ide_unregister() to drive_release_dev()
* convert ide_driver_t->name to driver->name
* convert ide_driver_t->{attach,cleanup} to driver->{probe,remove}
* remove ide_driver_t->busy as ide_bus_type->subsys.rwsem
  protects against concurrent ->{probe,remove} calls
* make ide_{un}register_driver() void as it cannot fail now
* use driver_{un}register() directly, remove ide_{un}register_driver()
* use device_register() instead of ata_attach(), remove ata_attach()
* add proc_print_driver() and ide_drivers_show(), remove ide_drivers_op
* fix ide_replace_subdriver() and move it to ide-proc.c
* remove ide_driver_t->drives, ide_drives and drives_lock
* remove ide_driver_t->drivers, drivers and drivers_lock
* remove ide_drive_t->driver and DRIVER() macro

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@elka.pw.edu.pl>

drivers/scsi/ide-scsi.c

@@ -713,7 +713,6 @@ static void idescsi_add_settings(ide_drive_t *drive)
  */
 static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi)
 {
-	DRIVER(drive)->busy++;
 	if (drive->id && (drive->id->config & 0x0060) == 0x20)
 		set_bit (IDESCSI_DRQ_INTERRUPT, &scsi->flags);
 	set_bit(IDESCSI_TRANSFORM, &scsi->transform);
@@ -722,17 +721,16 @@ static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi)
 	set_bit(IDESCSI_LOG_CMD, &scsi->log);
 #endif /* IDESCSI_DEBUG_LOG */
 	idescsi_add_settings(drive);
-	DRIVER(drive)->busy--;
 }
 
-static int idescsi_cleanup (ide_drive_t *drive)
+static int ide_scsi_remove(struct device *dev)
 {
+	ide_drive_t *drive = to_ide_device(dev);
 	struct Scsi_Host *scsihost = drive->driver_data;
 	struct ide_scsi_obj *scsi = scsihost_to_idescsi(scsihost);
 	struct gendisk *g = scsi->disk;
 
-	if (ide_unregister_subdriver(drive))
-		return 1;
+	ide_unregister_subdriver(drive, scsi->driver);
 
 	ide_unregister_region(g);
 
@@ -746,7 +744,7 @@ static int idescsi_cleanup (ide_drive_t *drive)
 	return 0;
 }
 
-static int idescsi_attach(ide_drive_t *drive);
+static int ide_scsi_probe(struct device *);
 
 #ifdef CONFIG_PROC_FS
 static ide_proc_entry_t idescsi_proc[] = {
@@ -757,24 +755,22 @@ static ide_proc_entry_t idescsi_proc[] = {
 # define idescsi_proc	NULL
 #endif
 
-/*
- *	IDE subdriver functions, registered with ide.c
- */
 static ide_driver_t idescsi_driver = {
 	.owner			= THIS_MODULE,
-	.name			= "ide-scsi",
+	.gen_driver = {
+		.name		= "ide-scsi",
+		.bus		= &ide_bus_type,
+		.probe		= ide_scsi_probe,
+		.remove		= ide_scsi_remove,
+	},
 	.version		= IDESCSI_VERSION,
 	.media			= ide_scsi,
-	.busy			= 0,
 	.supports_dsc_overlap	= 0,
 	.proc			= idescsi_proc,
-	.attach			= idescsi_attach,
-	.cleanup		= idescsi_cleanup,
 	.do_request		= idescsi_do_request,
 	.end_request		= idescsi_end_request,
 	.error                  = idescsi_atapi_error,
 	.abort                  = idescsi_atapi_abort,
-	.drives			= LIST_HEAD_INIT(idescsi_driver.drives),
 };
 
 static int idescsi_ide_open(struct inode *inode, struct file *filp)
@@ -821,8 +817,6 @@ static struct block_device_operations idescsi_ops = {
 	.ioctl		= idescsi_ide_ioctl,
 };
 
-static int idescsi_attach(ide_drive_t *drive);
-
 static int idescsi_slave_configure(struct scsi_device * sdp)
 {
 	/* Configure detected device */
@@ -1095,8 +1089,9 @@ static struct scsi_host_template idescsi_template = {
 	.proc_name		= "ide-scsi",
 };
 
-static int idescsi_attach(ide_drive_t *drive)
+static int ide_scsi_probe(struct device *dev)
 {
+	ide_drive_t *drive = to_ide_device(dev);
 	idescsi_scsi_t *idescsi;
 	struct Scsi_Host *host;
 	struct gendisk *g;
@@ -1112,7 +1107,7 @@ static int idescsi_attach(ide_drive_t *drive)
 	    !drive->present ||
 	    drive->media == ide_disk ||
 	    !(host = scsi_host_alloc(&idescsi_template,sizeof(idescsi_scsi_t))))
-		return 1;
+		return -ENODEV;
 
 	g = alloc_disk(1 << PARTN_BITS);
 	if (!g)
@@ -1138,20 +1133,19 @@ static int idescsi_attach(ide_drive_t *drive)
 	idescsi->host = host;
 	idescsi->disk = g;
 	g->private_data = &idescsi->driver;
-	err = ide_register_subdriver(drive, &idescsi_driver);
+	ide_register_subdriver(drive, &idescsi_driver);
+	err = 0;
+	idescsi_setup(drive, idescsi);
+	g->fops = &idescsi_ops;
+	ide_register_region(g);
+	err = scsi_add_host(host, &drive->gendev);
 	if (!err) {
-		idescsi_setup (drive, idescsi);
-		g->fops = &idescsi_ops;
-		ide_register_region(g);
-		err = scsi_add_host(host, &drive->gendev);
-		if (!err) {
-			scsi_scan_host(host);
-			return 0;
-		}
-		/* fall through on error */
-		ide_unregister_region(g);
-		ide_unregister_subdriver(drive);
+		scsi_scan_host(host);
+		return 0;
 	}
+	/* fall through on error */
+	ide_unregister_region(g);
+	ide_unregister_subdriver(drive, &idescsi_driver);
 
 	put_disk(g);
 out_host_put:
@@ -1161,12 +1155,12 @@ out_host_put:
 
 static int __init init_idescsi_module(void)
 {
-	return ide_register_driver(&idescsi_driver);
+	return driver_register(&idescsi_driver.gen_driver);
 }
 
 static void __exit exit_idescsi_module(void)
 {
-	ide_unregister_driver(&idescsi_driver);
+	driver_unregister(&idescsi_driver.gen_driver);
 }
 
 module_init(init_idescsi_module);