[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>

7 files changed, 186 insertions, 401 deletions

diff --git a/drivers/ide/ide-cd.c b/drivers/ide/ide-cd.c
index 4f7ce705622..f0bd242e030 100644
--- a/drivers/ide/ide-cd.c
+++ b/drivers/ide/ide-cd.c
@@ -3255,16 +3255,12 @@ sector_t ide_cdrom_capacity (ide_drive_t *drive)
         return capacity * sectors_per_frame;
 }
 
-static
-int ide_cdrom_cleanup(ide_drive_t *drive)
+static int ide_cd_remove(struct device *dev)
 {
+        ide_drive_t *drive = to_ide_device(dev);
         struct cdrom_info *info = drive->driver_data;
 
-        if (ide_unregister_subdriver(drive)) {
-                printk(KERN_ERR "%s: %s: failed to ide_unregister_subdriver\n",
-                        __FUNCTION__, drive->name);
-                return 1;
-        }
+        ide_unregister_subdriver(drive, info->driver);
 
         del_gendisk(info->disk);
 
@@ -3297,7 +3293,7 @@ static void ide_cd_release(struct kref *kref)
         kfree(info);
 }
 
-static int ide_cdrom_attach (ide_drive_t *drive);
+static int ide_cd_probe(struct device *);
 
 #ifdef CONFIG_PROC_FS
 static int proc_idecd_read_capacity
@@ -3320,19 +3316,20 @@ static ide_proc_entry_t idecd_proc[] = {
 
 static ide_driver_t ide_cdrom_driver = {
         .owner                  = THIS_MODULE,
-        .name                   = "ide-cdrom",
+        .gen_driver = {
+                .name           = "ide-cdrom",
+                .bus            = &ide_bus_type,
+                .probe          = ide_cd_probe,
+                .remove         = ide_cd_remove,
+        },
         .version                = IDECD_VERSION,
         .media                  = ide_cdrom,
-        .busy                   = 0,
         .supports_dsc_overlap   = 1,
-        .cleanup                = ide_cdrom_cleanup,
         .do_request             = ide_do_rw_cdrom,
         .end_request            = ide_end_request,
         .error                  = __ide_error,
         .abort                  = __ide_abort,
         .proc                   = idecd_proc,
-        .attach                 = ide_cdrom_attach,
-        .drives                 = LIST_HEAD_INIT(ide_cdrom_driver.drives),
 };
 
 static int idecd_open(struct inode * inode, struct file * file)
@@ -3418,8 +3415,9 @@ static char *ignore = NULL;
 module_param(ignore, charp, 0400);
 MODULE_DESCRIPTION("ATAPI CD-ROM Driver");
 
-static int ide_cdrom_attach (ide_drive_t *drive)
+static int ide_cd_probe(struct device *dev)
 {
+        ide_drive_t *drive = to_ide_device(dev);
         struct cdrom_info *info;
         struct gendisk *g;
         struct request_sense sense;
@@ -3453,11 +3451,8 @@ static int ide_cdrom_attach (ide_drive_t *drive)
 
         ide_init_disk(g, drive);
 
-        if (ide_register_subdriver(drive, &ide_cdrom_driver)) {
-                printk(KERN_ERR "%s: Failed to register the driver with ide.c\n",
-                        drive->name);
-                goto out_put_disk;
-        }
+        ide_register_subdriver(drive, &ide_cdrom_driver);
+
         memset(info, 0, sizeof (struct cdrom_info));
 
         kref_init(&info->kref);
@@ -3470,7 +3465,6 @@ static int ide_cdrom_attach (ide_drive_t *drive)
 
         drive->driver_data = info;
 
-        DRIVER(drive)->busy++;
         g->minors = 1;
         snprintf(g->devfs_name, sizeof(g->devfs_name),
                         "%s/cd", drive->devfs_name);
@@ -3478,8 +3472,7 @@ static int ide_cdrom_attach (ide_drive_t *drive)
         g->flags = GENHD_FL_CD | GENHD_FL_REMOVABLE;
         if (ide_cdrom_setup(drive)) {
                 struct cdrom_device_info *devinfo = &info->devinfo;
-                DRIVER(drive)->busy--;
-                ide_unregister_subdriver(drive);
+                ide_unregister_subdriver(drive, &ide_cdrom_driver);
                 if (info->buffer != NULL)
                         kfree(info->buffer);
                 if (info->toc != NULL)
@@ -3492,7 +3485,6 @@ static int ide_cdrom_attach (ide_drive_t *drive)
                 drive->driver_data = NULL;
                 goto failed;
         }
-        DRIVER(drive)->busy--;
 
         cdrom_read_toc(drive, &sense);
         g->fops = &idecd_ops;
@@ -3500,23 +3492,20 @@ static int ide_cdrom_attach (ide_drive_t *drive)
         add_disk(g);
         return 0;
 
-out_put_disk:
-        put_disk(g);
 out_free_cd:
         kfree(info);
 failed:
-        return 1;
+        return -ENODEV;
 }
 
 static void __exit ide_cdrom_exit(void)
 {
-        ide_unregister_driver(&ide_cdrom_driver);
+        driver_unregister(&ide_cdrom_driver.gen_driver);
 }
  
 static int ide_cdrom_init(void)
 {
-        ide_register_driver(&ide_cdrom_driver);
-        return 0;
+        return driver_register(&ide_cdrom_driver.gen_driver);
 }
 
 module_init(ide_cdrom_init);
diff --git a/drivers/ide/ide-disk.c b/drivers/ide/ide-disk.c
index 5d54f775610..3302cd8eab4 100644
--- a/drivers/ide/ide-disk.c
+++ b/drivers/ide/ide-disk.c
@@ -1024,14 +1024,16 @@ static void ide_cacheflush_p(ide_drive_t *drive)
                 printk(KERN_INFO "%s: wcache flush failed!\n", drive->name);
 }
 
-static int idedisk_cleanup (ide_drive_t *drive)
+static int ide_disk_remove(struct device *dev)
 {
+        ide_drive_t *drive = to_ide_device(dev);
         struct ide_disk_obj *idkp = drive->driver_data;
         struct gendisk *g = idkp->disk;
 
         ide_cacheflush_p(drive);
-        if (ide_unregister_subdriver(drive))
-                return 1;
+
+        ide_unregister_subdriver(drive, idkp->driver);
+
         del_gendisk(g);
 
         ide_disk_put(idkp);
@@ -1052,7 +1054,7 @@ static void ide_disk_release(struct kref *kref)
         kfree(idkp);
 }
 
-static int idedisk_attach(ide_drive_t *drive);
+static int ide_disk_probe(struct device *dev);
 
 static void ide_device_shutdown(struct device *dev)
 {
@@ -1082,27 +1084,23 @@ static void ide_device_shutdown(struct device *dev)
         dev->bus->suspend(dev, PMSG_SUSPEND);
 }
 
-/*
- *      IDE subdriver functions, registered with ide.c
- */
 static ide_driver_t idedisk_driver = {
         .owner                  = THIS_MODULE,
         .gen_driver = {
+                .name           = "ide-disk",
+                .bus            = &ide_bus_type,
+                .probe          = ide_disk_probe,
+                .remove         = ide_disk_remove,
                 .shutdown       = ide_device_shutdown,
         },
-        .name                   = "ide-disk",
         .version                = IDEDISK_VERSION,
         .media                  = ide_disk,
-        .busy                   = 0,
         .supports_dsc_overlap   = 0,
-        .cleanup                = idedisk_cleanup,
         .do_request             = ide_do_rw_disk,
         .end_request            = ide_end_request,
         .error                  = __ide_error,
         .abort                  = __ide_abort,
         .proc                   = idedisk_proc,
-        .attach                 = idedisk_attach,
-        .drives                 = LIST_HEAD_INIT(idedisk_driver.drives),
 };
 
 static int idedisk_open(struct inode *inode, struct file *filp)
@@ -1199,8 +1197,9 @@ static struct block_device_operations idedisk_ops = {
 
 MODULE_DESCRIPTION("ATA DISK Driver");
 
-static int idedisk_attach(ide_drive_t *drive)
+static int ide_disk_probe(struct device *dev)
 {
+        ide_drive_t *drive = to_ide_device(dev);
         struct ide_disk_obj *idkp;
         struct gendisk *g;
 
@@ -1222,10 +1221,7 @@ static int idedisk_attach(ide_drive_t *drive)
 
         ide_init_disk(g, drive);
 
-        if (ide_register_subdriver(drive, &idedisk_driver)) {
-                printk (KERN_ERR "ide-disk: %s: Failed to register the driver with ide.c\n", drive->name);
-                goto out_put_disk;
-        }
+        ide_register_subdriver(drive, &idedisk_driver);
 
         memset(idkp, 0, sizeof(*idkp));
 
@@ -1239,7 +1235,6 @@ static int idedisk_attach(ide_drive_t *drive)
 
         drive->driver_data = idkp;
 
-        DRIVER(drive)->busy++;
         idedisk_setup(drive);
         if ((!drive->head || drive->head > 16) && !drive->select.b.lba) {
                 printk(KERN_ERR "%s: INVALID GEOMETRY: %d PHYSICAL HEADS?\n",
@@ -1247,7 +1242,7 @@ static int idedisk_attach(ide_drive_t *drive)
                 drive->attach = 0;
         } else
                 drive->attach = 1;
-        DRIVER(drive)->busy--;
+
         g->minors = 1 << PARTN_BITS;
         strcpy(g->devfs_name, drive->devfs_name);
         g->driverfs_dev = &drive->gendev;
@@ -1257,22 +1252,20 @@ static int idedisk_attach(ide_drive_t *drive)
         add_disk(g);
         return 0;
 
-out_put_disk:
-        put_disk(g);
 out_free_idkp:
         kfree(idkp);
 failed:
-        return 1;
+        return -ENODEV;
 }
 
 static void __exit idedisk_exit (void)
 {
-        ide_unregister_driver(&idedisk_driver);
+        driver_unregister(&idedisk_driver.gen_driver);
 }
 
 static int idedisk_init (void)
 {
-        return ide_register_driver(&idedisk_driver);
+        return driver_register(&idedisk_driver.gen_driver);
 }
 
 module_init(idedisk_init);
diff --git a/drivers/ide/ide-floppy.c b/drivers/ide/ide-floppy.c
index 36c0b74a4e4..c949e98df4b 100644
--- a/drivers/ide/ide-floppy.c
+++ b/drivers/ide/ide-floppy.c
@@ -1865,13 +1865,13 @@ static void idefloppy_setup (ide_drive_t *drive, idefloppy_floppy_t *floppy)
         idefloppy_add_settings(drive);
 }
 
-static int idefloppy_cleanup (ide_drive_t *drive)
+static int ide_floppy_remove(struct device *dev)
 {
+        ide_drive_t *drive = to_ide_device(dev);
         idefloppy_floppy_t *floppy = drive->driver_data;
         struct gendisk *g = floppy->disk;
 
-        if (ide_unregister_subdriver(drive))
-                return 1;
+        ide_unregister_subdriver(drive, floppy->driver);
 
         del_gendisk(g);
 
@@ -1916,26 +1916,24 @@ static ide_proc_entry_t idefloppy_proc[] = {
 
 #endif  /* CONFIG_PROC_FS */
 
-static int idefloppy_attach(ide_drive_t *drive);
+static int ide_floppy_probe(struct device *);
 
-/*
- *      IDE subdriver functions, registered with ide.c
- */
 static ide_driver_t idefloppy_driver = {
         .owner                  = THIS_MODULE,
-        .name                   = "ide-floppy",
+        .gen_driver = {
+                .name           = "ide-floppy",
+                .bus            = &ide_bus_type,
+                .probe          = ide_floppy_probe,
+                .remove         = ide_floppy_remove,
+        },
         .version                = IDEFLOPPY_VERSION,
         .media                  = ide_floppy,
-        .busy                   = 0,
         .supports_dsc_overlap   = 0,
-        .cleanup                = idefloppy_cleanup,
         .do_request             = idefloppy_do_request,
         .end_request            = idefloppy_do_end_request,
         .error                  = __ide_error,
         .abort                  = __ide_abort,
         .proc                   = idefloppy_proc,
-        .attach                 = idefloppy_attach,
-        .drives                 = LIST_HEAD_INIT(idefloppy_driver.drives),
 };
 
 static int idefloppy_open(struct inode *inode, struct file *filp)
@@ -2122,8 +2120,9 @@ static struct block_device_operations idefloppy_ops = {
         .revalidate_disk= idefloppy_revalidate_disk
 };
 
-static int idefloppy_attach (ide_drive_t *drive)
+static int ide_floppy_probe(struct device *dev)
 {
+        ide_drive_t *drive = to_ide_device(dev);
         idefloppy_floppy_t *floppy;
         struct gendisk *g;
 
@@ -2152,10 +2151,7 @@ static int idefloppy_attach (ide_drive_t *drive)
 
         ide_init_disk(g, drive);
 
-        if (ide_register_subdriver(drive, &idefloppy_driver)) {
-                printk (KERN_ERR "ide-floppy: %s: Failed to register the driver with ide.c\n", drive->name);
-                goto out_put_disk;
-        }
+        ide_register_subdriver(drive, &idefloppy_driver);
 
         memset(floppy, 0, sizeof(*floppy));
 
@@ -2169,9 +2165,8 @@ static int idefloppy_attach (ide_drive_t *drive)
 
         drive->driver_data = floppy;
 
-        DRIVER(drive)->busy++;
         idefloppy_setup (drive, floppy);
-        DRIVER(drive)->busy--;
+
         g->minors = 1 << PARTN_BITS;
         g->driverfs_dev = &drive->gendev;
         strcpy(g->devfs_name, drive->devfs_name);
@@ -2181,19 +2176,17 @@ static int idefloppy_attach (ide_drive_t *drive)
         add_disk(g);
         return 0;
 
-out_put_disk:
-        put_disk(g);
 out_free_floppy:
         kfree(floppy);
 failed:
-        return 1;
+        return -ENODEV;
 }
 
 MODULE_DESCRIPTION("ATAPI FLOPPY Driver");
 
 static void __exit idefloppy_exit (void)
 {
-        ide_unregister_driver(&idefloppy_driver);
+        driver_unregister(&idefloppy_driver.gen_driver);
 }
 
 /*
@@ -2202,8 +2195,7 @@ static void __exit idefloppy_exit (void)
 static int idefloppy_init (void)
 {
         printk("ide-floppy driver " IDEFLOPPY_VERSION "\n");
-        ide_register_driver(&idefloppy_driver);
-        return 0;
+        return driver_register(&idefloppy_driver.gen_driver);
 }
 
 module_init(idefloppy_init);
diff --git a/drivers/ide/ide-probe.c b/drivers/ide/ide-probe.c
index 554473a95cf..53b84a84f6c 100644
--- a/drivers/ide/ide-probe.c
+++ b/drivers/ide/ide-probe.c
@@ -47,6 +47,7 @@
 #include <linux/slab.h>
 #include <linux/delay.h>
 #include <linux/ide.h>
+#include <linux/devfs_fs_kernel.h>
 #include <linux/spinlock.h>
 #include <linux/kmod.h>
 #include <linux/pci.h>
@@ -918,7 +919,7 @@ int probe_hwif_init_with_fixup(ide_hwif_t *hwif, void (*fixup)(ide_hwif_t *hwif)
                            want them on default or a new "empty" class
                            for hotplug reprobing ? */
                         if (drive->present) {
-                                ata_attach(drive);
+                                device_register(&drive->gendev);
                         }
                 }
         }
@@ -1279,10 +1280,51 @@ void ide_init_disk(struct gendisk *disk, ide_drive_t *drive)
 
 EXPORT_SYMBOL_GPL(ide_init_disk);
 
+static void ide_remove_drive_from_hwgroup(ide_drive_t *drive)
+{
+        ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
+
+        if (drive == drive->next) {
+                /* special case: last drive from hwgroup. */
+                BUG_ON(hwgroup->drive != drive);
+                hwgroup->drive = NULL;
+        } else {
+                ide_drive_t *walk;
+
+                walk = hwgroup->drive;
+                while (walk->next != drive)
+                        walk = walk->next;
+                walk->next = drive->next;
+                if (hwgroup->drive == drive) {
+                        hwgroup->drive = drive->next;
+                        hwgroup->hwif = hwgroup->drive->hwif;
+                }
+        }
+        BUG_ON(hwgroup->drive == drive);
+}
+
 static void drive_release_dev (struct device *dev)
 {
         ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
 
+        spin_lock_irq(&ide_lock);
+        if (drive->devfs_name[0] != '\0') {
+                devfs_remove(drive->devfs_name);
+                drive->devfs_name[0] = '\0';
+        }
+        ide_remove_drive_from_hwgroup(drive);
+        if (drive->id != NULL) {
+                kfree(drive->id);
+                drive->id = NULL;
+        }
+        drive->present = 0;
+        /* Messed up locking ... */
+        spin_unlock_irq(&ide_lock);
+        blk_cleanup_queue(drive->queue);
+        spin_lock_irq(&ide_lock);
+        drive->queue = NULL;
+        spin_unlock_irq(&ide_lock);
+
         up(&drive->gendev_rel_sem);
 }
 
@@ -1306,7 +1348,6 @@ static void init_gendisk (ide_hwif_t *hwif)
                 drive->gendev.driver_data = drive;
                 drive->gendev.release = drive_release_dev;
                 if (drive->present) {
-                        device_register(&drive->gendev);
                         sprintf(drive->devfs_name, "ide/host%d/bus%d/target%d/lun%d",
                                 (hwif->channel && hwif->mate) ?
                                 hwif->mate->index : hwif->index,
@@ -1412,7 +1453,7 @@ int ideprobe_init (void)
                                 hwif->chipset = ide_generic;
                         for (unit = 0; unit < MAX_DRIVES; ++unit)
                                 if (hwif->drives[unit].present)
-                                        ata_attach(&hwif->drives[unit]);
+                                        device_register(&hwif->drives[unit].gendev);
                 }
         }
         return 0;
diff --git a/drivers/ide/ide-proc.c b/drivers/ide/ide-proc.c
index 4b1e43b4118..4063d2c34e3 100644
--- a/drivers/ide/ide-proc.c
+++ b/drivers/ide/ide-proc.c
@@ -307,17 +307,41 @@ static int proc_ide_read_driver
         (char *page, char **start, off_t off, int count, int *eof, void *data)
 {
         ide_drive_t     *drive = (ide_drive_t *) data;
-        ide_driver_t    *driver = drive->driver;
+        struct device   *dev = &drive->gendev;
+        ide_driver_t    *ide_drv;
         int             len;
 
-        if (driver) {
+        down_read(&dev->bus->subsys.rwsem);
+        if (dev->driver) {
+                ide_drv = container_of(dev->driver, ide_driver_t, gen_driver);
                 len = sprintf(page, "%s version %s\n",
-                                driver->name, driver->version);
+                                dev->driver->name, ide_drv->version);
         } else
                 len = sprintf(page, "ide-default version 0.9.newide\n");
+        up_read(&dev->bus->subsys.rwsem);
         PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
 }
 
+static int ide_replace_subdriver(ide_drive_t *drive, const char *driver)
+{
+        struct device *dev = &drive->gendev;
+        int ret = 1;
+
+        down_write(&dev->bus->subsys.rwsem);
+        device_release_driver(dev);
+        /* FIXME: device can still be in use by previous driver */
+        strlcpy(drive->driver_req, driver, sizeof(drive->driver_req));
+        device_attach(dev);
+        drive->driver_req[0] = 0;
+        if (dev->driver == NULL)
+                device_attach(dev);
+        if (dev->driver && !strcmp(dev->driver->name, driver))
+                ret = 0;
+        up_write(&dev->bus->subsys.rwsem);
+
+        return ret;
+}
+
 static int proc_ide_write_driver
         (struct file *file, const char __user *buffer, unsigned long count, void *data)
 {
@@ -488,16 +512,32 @@ void destroy_proc_ide_interface(ide_hwif_t *hwif)
         }
 }
 
-extern struct seq_operations ide_drivers_op;
+static int proc_print_driver(struct device_driver *drv, void *data)
+{
+        ide_driver_t *ide_drv = container_of(drv, ide_driver_t, gen_driver);
+        struct seq_file *s = data;
+
+        seq_printf(s, "%s version %s\n", drv->name, ide_drv->version);
+
+        return 0;
+}
+
+static int ide_drivers_show(struct seq_file *s, void *p)
+{
+        bus_for_each_drv(&ide_bus_type, NULL, s, proc_print_driver);
+        return 0;
+}
+
 static int ide_drivers_open(struct inode *inode, struct file *file)
 {
-        return seq_open(file, &ide_drivers_op);
+        return single_open(file, &ide_drivers_show, NULL);
 }
+
 static struct file_operations ide_drivers_operations = {
         .open           = ide_drivers_open,
         .read           = seq_read,
         .llseek         = seq_lseek,
-        .release        = seq_release,
+        .release        = single_release,
 };
 
 void proc_ide_create(void)
diff --git a/drivers/ide/ide-tape.c b/drivers/ide/ide-tape.c
index 48254485498..5a3dc46008e 100644
--- a/drivers/ide/ide-tape.c
+++ b/drivers/ide/ide-tape.c
@@ -4681,21 +4681,12 @@ static void idetape_setup (ide_drive_t *drive, idetape_tape_t *tape, int minor)
         idetape_add_settings(drive);
 }
 
-static int idetape_cleanup (ide_drive_t *drive)
+static int ide_tape_remove(struct device *dev)
 {
+        ide_drive_t *drive = to_ide_device(dev);
         idetape_tape_t *tape = drive->driver_data;
-        unsigned long flags;
-
-        spin_lock_irqsave(&ide_lock, flags);
-        if (test_bit(IDETAPE_BUSY, &tape->flags) || drive->usage ||
-            tape->first_stage != NULL || tape->merge_stage_size) {
-                spin_unlock_irqrestore(&ide_lock, flags);
-                return 1;
-        }
 
-        spin_unlock_irqrestore(&ide_lock, flags);
-        DRIVER(drive)->busy = 0;
-        (void) ide_unregister_subdriver(drive);
+        ide_unregister_subdriver(drive, tape->driver);
 
         ide_unregister_region(tape->disk);
 
@@ -4710,6 +4701,8 @@ static void ide_tape_release(struct kref *kref)
         ide_drive_t *drive = tape->drive;
         struct gendisk *g = tape->disk;
 
+        BUG_ON(tape->first_stage != NULL || tape->merge_stage_size);
+
         drive->dsc_overlap = 0;
         drive->driver_data = NULL;
         devfs_remove("%s/mt", drive->devfs_name);
@@ -4747,26 +4740,24 @@ static ide_proc_entry_t idetape_proc[] = {
 
 #endif
 
-static int idetape_attach(ide_drive_t *drive);
+static int ide_tape_probe(struct device *);
 
-/*
- *      IDE subdriver functions, registered with ide.c
- */
 static ide_driver_t idetape_driver = {
         .owner                  = THIS_MODULE,
-        .name                   = "ide-tape",
+        .gen_driver = {
+                .name           = "ide-tape",
+                .bus            = &ide_bus_type,
+                .probe          = ide_tape_probe,
+                .remove         = ide_tape_remove,
+        },
         .version                = IDETAPE_VERSION,
         .media                  = ide_tape,
-        .busy                   = 1,
         .supports_dsc_overlap   = 1,
-        .cleanup                = idetape_cleanup,
         .do_request             = idetape_do_request,
         .end_request            = idetape_end_request,
         .error                  = __ide_error,
         .abort                  = __ide_abort,
         .proc                   = idetape_proc,
-        .attach                 = idetape_attach,
-        .drives                 = LIST_HEAD_INIT(idetape_driver.drives),
 };
 
 /*
@@ -4829,8 +4820,9 @@ static struct block_device_operations idetape_block_ops = {
         .ioctl          = idetape_ioctl,
 };
 
-static int idetape_attach (ide_drive_t *drive)
+static int ide_tape_probe(struct device *dev)
 {
+        ide_drive_t *drive = to_ide_device(dev);
         idetape_tape_t *tape;
         struct gendisk *g;
         int minor;
@@ -4865,10 +4857,7 @@ static int idetape_attach (ide_drive_t *drive)
 
         ide_init_disk(g, drive);
 
-        if (ide_register_subdriver(drive, &idetape_driver)) {
-                printk(KERN_ERR "ide-tape: %s: Failed to register the driver with ide.c\n", drive->name);
-                goto out_put_disk;
-        }
+        ide_register_subdriver(drive, &idetape_driver);
 
         memset(tape, 0, sizeof(*tape));
 
@@ -4902,12 +4891,11 @@ static int idetape_attach (ide_drive_t *drive)
         ide_register_region(g);
 
         return 0;
-out_put_disk:
-        put_disk(g);
+
 out_free_tape:
         kfree(tape);
 failed:
-        return 1;
+        return -ENODEV;
 }
 
 MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver");
@@ -4915,7 +4903,7 @@ MODULE_LICENSE("GPL");
 
 static void __exit idetape_exit (void)
 {
-        ide_unregister_driver(&idetape_driver);
+        driver_unregister(&idetape_driver.gen_driver);
         unregister_chrdev(IDETAPE_MAJOR, "ht");
 }
 
@@ -4928,8 +4916,7 @@ static int idetape_init (void)
                 printk(KERN_ERR "ide-tape: Failed to register character device interface\n");
                 return -EBUSY;
         }
-        ide_register_driver(&idetape_driver);
-        return 0;
+        return driver_register(&idetape_driver.gen_driver);
 }
 
 module_init(idetape_init);
diff --git a/drivers/ide/ide.c b/drivers/ide/ide.c
index 973dec799b5..dae1bd5b8c3 100644
--- a/drivers/ide/ide.c
+++ b/drivers/ide/ide.c
@@ -196,8 +196,6 @@ ide_hwif_t ide_hwifs[MAX_HWIFS];	/* master data repository */
 
 EXPORT_SYMBOL(ide_hwifs);
 
-static struct list_head ide_drives = LIST_HEAD_INIT(ide_drives);
-
 /*
  * Do not even *think* about calling this!
  */
@@ -358,54 +356,6 @@ static int ide_system_bus_speed(void)
         return system_bus_speed;
 }
 
-/*
- *      drives_lock protects the list of drives, drivers_lock the
- *      list of drivers.  Currently nobody takes both at once.
- */
-
-static DEFINE_SPINLOCK(drives_lock);
-static DEFINE_SPINLOCK(drivers_lock);
-static LIST_HEAD(drivers);
-
-/* Iterator for the driver list. */
-
-static void *m_start(struct seq_file *m, loff_t *pos)
-{
-        struct list_head *p;
-        loff_t l = *pos;
-        spin_lock(&drivers_lock);
-        list_for_each(p, &drivers)
-                if (!l--)
-                        return list_entry(p, ide_driver_t, drivers);
-        return NULL;
-}
-
-static void *m_next(struct seq_file *m, void *v, loff_t *pos)
-{
-        struct list_head *p = ((ide_driver_t *)v)->drivers.next;
-        (*pos)++;
-        return p==&drivers ? NULL : list_entry(p, ide_driver_t, drivers);
-}
-
-static void m_stop(struct seq_file *m, void *v)
-{
-        spin_unlock(&drivers_lock);
-}
-
-static int show_driver(struct seq_file *m, void *v)
-{
-        ide_driver_t *driver = v;
-        seq_printf(m, "%s version %s\n", driver->name, driver->version);
-        return 0;
-}
-
-struct seq_operations ide_drivers_op = {
-        .start  = m_start,
-        .next   = m_next,
-        .stop   = m_stop,
-        .show   = show_driver
-};
-
 #ifdef CONFIG_PROC_FS
 struct proc_dir_entry *proc_ide_root;
 #endif
@@ -630,7 +580,7 @@ void ide_unregister(unsigned int index)
         ide_hwif_t *hwif, *g;
         static ide_hwif_t tmp_hwif; /* protected by ide_cfg_sem */
         ide_hwgroup_t *hwgroup;
-        int irq_count = 0, unit, i;
+        int irq_count = 0, unit;
 
         BUG_ON(index >= MAX_HWIFS);
 
@@ -643,23 +593,22 @@ void ide_unregister(unsigned int index)
                 goto abort;
         for (unit = 0; unit < MAX_DRIVES; ++unit) {
                 drive = &hwif->drives[unit];
-                if (!drive->present)
+                if (!drive->present) {
+                        if (drive->devfs_name[0] != '\0') {
+                                devfs_remove(drive->devfs_name);
+                                drive->devfs_name[0] = '\0';
+                        }
                         continue;
-                if (drive->usage || DRIVER(drive)->busy)
-                        goto abort;
-                drive->dead = 1;
+                }
+                spin_unlock_irq(&ide_lock);
+                device_unregister(&drive->gendev);
+                down(&drive->gendev_rel_sem);
+                spin_lock_irq(&ide_lock);
         }
         hwif->present = 0;
 
         spin_unlock_irq(&ide_lock);
 
-        for (unit = 0; unit < MAX_DRIVES; ++unit) {
-                drive = &hwif->drives[unit];
-                if (!drive->present)
-                        continue;
-                DRIVER(drive)->cleanup(drive);
-        }
-
         destroy_proc_ide_interface(hwif);
 
         hwgroup = hwif->hwgroup;
@@ -687,44 +636,6 @@ void ide_unregister(unsigned int index)
          * Remove us from the hwgroup, and free
          * the hwgroup if we were the only member
          */
-        for (i = 0; i < MAX_DRIVES; ++i) {
-                drive = &hwif->drives[i];
-                if (drive->devfs_name[0] != '\0') {
-                        devfs_remove(drive->devfs_name);
-                        drive->devfs_name[0] = '\0';
-                }
-                if (!drive->present)
-                        continue;
-                if (drive == drive->next) {
-                        /* special case: last drive from hwgroup. */
-                        BUG_ON(hwgroup->drive != drive);
-                        hwgroup->drive = NULL;
-                } else {
-                        ide_drive_t *walk;
-
-                        walk = hwgroup->drive;
-                        while (walk->next != drive)
-                                walk = walk->next;
-                        walk->next = drive->next;
-                        if (hwgroup->drive == drive) {
-                                hwgroup->drive = drive->next;
-                                hwgroup->hwif = HWIF(hwgroup->drive);
-                        }
-                }
-                BUG_ON(hwgroup->drive == drive);
-                if (drive->id != NULL) {
-                        kfree(drive->id);
-                        drive->id = NULL;
-                }
-                drive->present = 0;
-                /* Messed up locking ... */
-                spin_unlock_irq(&ide_lock);
-                blk_cleanup_queue(drive->queue);
-                device_unregister(&drive->gendev);
-                down(&drive->gendev_rel_sem);
-                spin_lock_irq(&ide_lock);
-                drive->queue = NULL;
-        }
         if (hwif->next == hwif) {
                 BUG_ON(hwgroup->hwif != hwif);
                 kfree(hwgroup);
@@ -1304,73 +1215,6 @@ int system_bus_clock (void)
 
 EXPORT_SYMBOL(system_bus_clock);
 
-/*
- *      Locking is badly broken here - since way back.  That sucker is
- * root-only, but that's not an excuse...  The real question is what
- * exclusion rules do we want here.
- */
-int ide_replace_subdriver (ide_drive_t *drive, const char *driver)
-{
-        if (!drive->present || drive->usage || drive->dead)
-                goto abort;
-        if (DRIVER(drive)->cleanup(drive))
-                goto abort;
-        strlcpy(drive->driver_req, driver, sizeof(drive->driver_req));
-        if (ata_attach(drive)) {
-                spin_lock(&drives_lock);
-                list_del_init(&drive->list);
-                spin_unlock(&drives_lock);
-                drive->driver_req[0] = 0;
-                ata_attach(drive);
-        } else {
-                drive->driver_req[0] = 0;
-        }
-        if (drive->driver && !strcmp(drive->driver->name, driver))
-                return 0;
-abort:
-        return 1;
-}
-
-/**
- *      ata_attach              -       attach an ATA/ATAPI device
- *      @drive: drive to attach
- *
- *      Takes a drive that is as yet not assigned to any midlayer IDE
- *      driver (or is assigned to the default driver) and figures out
- *      which driver would like to own it. If nobody claims the drive
- *      then it is automatically attached to the default driver used for
- *      unclaimed objects.
- *
- *      A return of zero indicates attachment to a driver, of one
- *      attachment to the default driver.
- *
- *      Takes drivers_lock.
- */
-
-int ata_attach(ide_drive_t *drive)
-{
-        struct list_head *p;
-        spin_lock(&drivers_lock);
-        list_for_each(p, &drivers) {
-                ide_driver_t *driver = list_entry(p, ide_driver_t, drivers);
-                if (!try_module_get(driver->owner))
-                        continue;
-                spin_unlock(&drivers_lock);
-                if (driver->attach(drive) == 0) {
-                        module_put(driver->owner);
-                        drive->gendev.driver = &driver->gen_driver;
-                        return 0;
-                }
-                spin_lock(&drivers_lock);
-                module_put(driver->owner);
-        }
-        drive->gendev.driver = NULL;
-        spin_unlock(&drivers_lock);
-        if (ide_register_subdriver(drive, NULL))
-                panic("ide: default attach failed");
-        return 1;
-}
-
 static int generic_ide_suspend(struct device *dev, pm_message_t state)
 {
         ide_drive_t *drive = dev->driver_data;
@@ -2013,27 +1857,11 @@ static void __init probe_for_hwifs (void)
 #endif
 }
 
-int ide_register_subdriver(ide_drive_t *drive, ide_driver_t *driver)
+void ide_register_subdriver(ide_drive_t *drive, ide_driver_t *driver)
 {
-        unsigned long flags;
-
-        spin_lock_irqsave(&ide_lock, flags);
-        if (!drive->present || drive->driver != NULL ||
-            drive->usage || drive->dead) {
-                spin_unlock_irqrestore(&ide_lock, flags);
-                return 1;
-        }
-        drive->driver = driver;
-        spin_unlock_irqrestore(&ide_lock, flags);
-        spin_lock(&drives_lock);
-        list_add_tail(&drive->list, driver ? &driver->drives : &ide_drives);
-        spin_unlock(&drives_lock);
-//      printk(KERN_INFO "%s: attached %s driver.\n", drive->name, driver->name);
 #ifdef CONFIG_PROC_FS
-        if (driver)
-                ide_add_proc_entries(drive->proc, driver->proc, drive);
+        ide_add_proc_entries(drive->proc, driver->proc, drive);
 #endif
-        return 0;
 }
 
 EXPORT_SYMBOL(ide_register_subdriver);
@@ -2041,136 +1869,51 @@ EXPORT_SYMBOL(ide_register_subdriver);
 /**
  *      ide_unregister_subdriver        -       disconnect drive from driver
  *      @drive: drive to unplug
+ *      @driver: driver
  *
  *      Disconnect a drive from the driver it was attached to and then
  *      clean up the various proc files and other objects attached to it.
  *
- *      Takes ide_setting_sem, ide_lock and drives_lock.
+ *      Takes ide_setting_sem and ide_lock.
  *      Caller must hold none of the locks.
- *
- *      No locking versus subdriver unload because we are moving to the
- *      default driver anyway. Wants double checking.
  */
 
-int ide_unregister_subdriver (ide_drive_t *drive)
+void ide_unregister_subdriver(ide_drive_t *drive, ide_driver_t *driver)
 {
         unsigned long flags;
         
         down(&ide_setting_sem);
         spin_lock_irqsave(&ide_lock, flags);
-        if (drive->usage || drive->driver == NULL || DRIVER(drive)->busy) {
-                spin_unlock_irqrestore(&ide_lock, flags);
-                up(&ide_setting_sem);
-                return 1;
-        }
 #ifdef CONFIG_PROC_FS
-        ide_remove_proc_entries(drive->proc, DRIVER(drive)->proc);
+        ide_remove_proc_entries(drive->proc, driver->proc);
 #endif
         auto_remove_settings(drive);
-        drive->driver = NULL;
         spin_unlock_irqrestore(&ide_lock, flags);
         up(&ide_setting_sem);
-        spin_lock(&drives_lock);
-        list_del_init(&drive->list);
-        spin_unlock(&drives_lock);
-        /* drive will be added to &ide_drives in ata_attach() */
-        return 0;
 }
 
 EXPORT_SYMBOL(ide_unregister_subdriver);
 
-static int ide_drive_remove(struct device * dev)
-{
-        ide_drive_t * drive = container_of(dev,ide_drive_t,gendev);
-        DRIVER(drive)->cleanup(drive);
-        return 0;
-}
-
-/**
- *      ide_register_driver     -       register IDE device driver
- *      @driver: the IDE device driver
- *
- *      Register a new device driver and then scan the devices
- *      on the IDE bus in case any should be attached to the
- *      driver we have just registered.  If so attach them.
- *
- *      Takes drivers_lock and drives_lock.
- */
-
-int ide_register_driver(ide_driver_t *driver)
-{
-        struct list_head list;
-        struct list_head *list_loop;
-        struct list_head *tmp_storage;
-
-        spin_lock(&drivers_lock);
-        list_add(&driver->drivers, &drivers);
-        spin_unlock(&drivers_lock);
-
-        INIT_LIST_HEAD(&list);
-        spin_lock(&drives_lock);
-        list_splice_init(&ide_drives, &list);
-        spin_unlock(&drives_lock);
-
-        list_for_each_safe(list_loop, tmp_storage, &list) {
-                ide_drive_t *drive = container_of(list_loop, ide_drive_t, list);
-                list_del_init(&drive->list);
-                if (drive->present)
-                        ata_attach(drive);
-        }
-        driver->gen_driver.name = (char *) driver->name;
-        driver->gen_driver.bus = &ide_bus_type;
-        driver->gen_driver.remove = ide_drive_remove;
-        return driver_register(&driver->gen_driver);
-}
-
-EXPORT_SYMBOL(ide_register_driver);
-
-/**
- *      ide_unregister_driver   -       unregister IDE device driver
- *      @driver: the IDE device driver
- *
- *      Called when a driver module is being unloaded. We reattach any
- *      devices to whatever driver claims them next (typically the default
- *      driver).
- *
- *      Takes drivers_lock and called functions will take ide_setting_sem.
- */
-
-void ide_unregister_driver(ide_driver_t *driver)
-{
-        ide_drive_t *drive;
-
-        spin_lock(&drivers_lock);
-        list_del(&driver->drivers);
-        spin_unlock(&drivers_lock);
-
-        driver_unregister(&driver->gen_driver);
-
-        while(!list_empty(&driver->drives)) {
-                drive = list_entry(driver->drives.next, ide_drive_t, list);
-                if (driver->cleanup(drive)) {
-                        printk(KERN_ERR "%s: cleanup_module() called while still busy\n", drive->name);
-                        BUG();
-                }
-                ata_attach(drive);
-        }
-}
-
-EXPORT_SYMBOL(ide_unregister_driver);
-
 /*
  * Probe module
  */
 
 EXPORT_SYMBOL(ide_lock);
 
+static int ide_bus_match(struct device *dev, struct device_driver *drv)
+{
+        return 1;
+}
+
 struct bus_type ide_bus_type = {
         .name           = "ide",
+        .match          = ide_bus_match,
         .suspend        = generic_ide_suspend,
         .resume         = generic_ide_resume,
 };
 
+EXPORT_SYMBOL_GPL(ide_bus_type);
+
 /*
  * This is gets invoked once during initialization, to set *everything* up
  */