Merge branch 'linus' into x86/setup-lzma

Conflicts:
	init/do_mounts_rd.c

1 files changed, 240 insertions, 234 deletions

diff --git a/drivers/ide/ide-probe.c b/drivers/ide/ide-probe.c
index c5adb7b9c5b5..0ccbb4459fb9 100644
--- a/drivers/ide/ide-probe.c
+++ b/drivers/ide/ide-probe.c
@@ -189,7 +189,7 @@ static void ide_classify_atapi_dev(ide_drive_t *drive)
 
 static void do_identify(ide_drive_t *drive, u8 cmd)
 {
-	ide_hwif_t *hwif = HWIF(drive);
+	ide_hwif_t *hwif = drive->hwif;
 	u16 *id = drive->id;
 	char *m = (char *)&id[ATA_ID_PROD];
 	unsigned long flags;
@@ -266,7 +266,7 @@ err_misc:
 
 static int actual_try_to_identify (ide_drive_t *drive, u8 cmd)
 {
-	ide_hwif_t *hwif = HWIF(drive);
+	ide_hwif_t *hwif = drive->hwif;
 	struct ide_io_ports *io_ports = &hwif->io_ports;
 	const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 	int use_altstatus = 0, rc;
@@ -341,7 +341,7 @@ static int actual_try_to_identify (ide_drive_t *drive, u8 cmd)
  
 static int try_to_identify (ide_drive_t *drive, u8 cmd)
 {
-	ide_hwif_t *hwif = HWIF(drive);
+	ide_hwif_t *hwif = drive->hwif;
 	const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 	int retval;
 	int autoprobe = 0;
@@ -438,7 +438,7 @@ static u8 ide_read_device(ide_drive_t *drive)
 
 static int do_probe (ide_drive_t *drive, u8 cmd)
 {
-	ide_hwif_t *hwif = HWIF(drive);
+	ide_hwif_t *hwif = drive->hwif;
 	const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 	int rc;
 	u8 present = !!(drive->dev_flags & IDE_DFLAG_PRESENT), stat;
@@ -463,7 +463,7 @@ static int do_probe (ide_drive_t *drive, u8 cmd)
 	if (ide_read_device(drive) != drive->select && present == 0) {
 		if (drive->dn & 1) {
 			/* exit with drive0 selected */
-			SELECT_DRIVE(&hwif->drives[0]);
+			SELECT_DRIVE(hwif->devices[0]);
 			/* allow ATA_BUSY to assert & clear */
 			msleep(50);
 		}
@@ -509,7 +509,7 @@ static int do_probe (ide_drive_t *drive, u8 cmd)
 	}
 	if (drive->dn & 1) {
 		/* exit with drive0 selected */
-		SELECT_DRIVE(&hwif->drives[0]);
+		SELECT_DRIVE(hwif->devices[0]);
 		msleep(50);
 		/* ensure drive irq is clear */
 		(void)tp_ops->read_status(hwif);
@@ -522,7 +522,7 @@ static int do_probe (ide_drive_t *drive, u8 cmd)
  */
 static void enable_nest (ide_drive_t *drive)
 {
-	ide_hwif_t *hwif = HWIF(drive);
+	ide_hwif_t *hwif = drive->hwif;
 	const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 	u8 stat;
 
@@ -697,7 +697,8 @@ out:
 
 static int ide_port_wait_ready(ide_hwif_t *hwif)
 {
-	int unit, rc;
+	ide_drive_t *drive;
+	int i, rc;
 
 	printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
 
@@ -714,9 +715,7 @@ static int ide_port_wait_ready(ide_hwif_t *hwif)
 		return rc;
 
 	/* Now make sure both master & slave are ready */
-	for (unit = 0; unit < MAX_DRIVES; unit++) {
-		ide_drive_t *drive = &hwif->drives[unit];
-
+	ide_port_for_each_dev(i, drive, hwif) {
 		/* Ignore disks that we will not probe for later. */
 		if ((drive->dev_flags & IDE_DFLAG_NOPROBE) == 0 ||
 		    (drive->dev_flags & IDE_DFLAG_PRESENT)) {
@@ -732,8 +731,8 @@ static int ide_port_wait_ready(ide_hwif_t *hwif)
 	}
 out:
 	/* Exit function with master reselected (let's be sane) */
-	if (unit)
-		SELECT_DRIVE(&hwif->drives[0]);
+	if (i)
+		SELECT_DRIVE(hwif->devices[0]);
 
 	return rc;
 }
@@ -749,7 +748,7 @@ out:
 
 void ide_undecoded_slave(ide_drive_t *dev1)
 {
-	ide_drive_t *dev0 = &dev1->hwif->drives[0];
+	ide_drive_t *dev0 = dev1->hwif->devices[0];
 
 	if ((dev1->dn & 1) == 0 || (dev0->dev_flags & IDE_DFLAG_PRESENT) == 0)
 		return;
@@ -778,14 +777,15 @@ EXPORT_SYMBOL_GPL(ide_undecoded_slave);
 
 static int ide_probe_port(ide_hwif_t *hwif)
 {
+	ide_drive_t *drive;
 	unsigned long flags;
 	unsigned int irqd;
-	int unit, rc = -ENODEV;
+	int i, rc = -ENODEV;
 
 	BUG_ON(hwif->present);
 
-	if ((hwif->drives[0].dev_flags & IDE_DFLAG_NOPROBE) &&
-	    (hwif->drives[1].dev_flags & IDE_DFLAG_NOPROBE))
+	if ((hwif->devices[0]->dev_flags & IDE_DFLAG_NOPROBE) &&
+	    (hwif->devices[1]->dev_flags & IDE_DFLAG_NOPROBE))
 		return -EACCES;
 
 	/*
@@ -796,7 +796,8 @@ static int ide_probe_port(ide_hwif_t *hwif)
 	if (irqd)
 		disable_irq(hwif->irq);
 
-	local_irq_set(flags);
+	local_irq_save(flags);
+	local_irq_enable_in_hardirq();
 
 	if (ide_port_wait_ready(hwif) == -EBUSY)
 		printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);
@@ -805,9 +806,7 @@ static int ide_probe_port(ide_hwif_t *hwif)
 	 * Second drive should only exist if first drive was found,
 	 * but a lot of cdrom drives are configured as single slaves.
 	 */
-	for (unit = 0; unit < MAX_DRIVES; ++unit) {
-		ide_drive_t *drive = &hwif->drives[unit];
-
+	ide_port_for_each_dev(i, drive, hwif) {
 		(void) probe_for_drive(drive);
 		if (drive->dev_flags & IDE_DFLAG_PRESENT)
 			rc = 0;
@@ -828,20 +827,17 @@ static int ide_probe_port(ide_hwif_t *hwif)
 static void ide_port_tune_devices(ide_hwif_t *hwif)
 {
 	const struct ide_port_ops *port_ops = hwif->port_ops;
-	int unit;
-
-	for (unit = 0; unit < MAX_DRIVES; unit++) {
-		ide_drive_t *drive = &hwif->drives[unit];
+	ide_drive_t *drive;
+	int i;
 
+	ide_port_for_each_dev(i, drive, hwif) {
 		if (drive->dev_flags & IDE_DFLAG_PRESENT) {
 			if (port_ops && port_ops->quirkproc)
 				port_ops->quirkproc(drive);
 		}
 	}
 
-	for (unit = 0; unit < MAX_DRIVES; ++unit) {
-		ide_drive_t *drive = &hwif->drives[unit];
-
+	ide_port_for_each_dev(i, drive, hwif) {
 		if (drive->dev_flags & IDE_DFLAG_PRESENT) {
 			ide_set_max_pio(drive);
 
@@ -852,11 +848,8 @@ static void ide_port_tune_devices(ide_hwif_t *hwif)
 		}
 	}
 
-	for (unit = 0; unit < MAX_DRIVES; ++unit) {
-		ide_drive_t *drive = &hwif->drives[unit];
-
-		if ((hwif->host_flags & IDE_HFLAG_NO_IO_32BIT) ||
-		    drive->id[ATA_ID_DWORD_IO])
+	ide_port_for_each_dev(i, drive, hwif) {
+		if (hwif->host_flags & IDE_HFLAG_NO_IO_32BIT)
 			drive->dev_flags |= IDE_DFLAG_NO_IO_32BIT;
 		else
 			drive->dev_flags &= ~IDE_DFLAG_NO_IO_32BIT;
@@ -869,7 +862,7 @@ static void ide_port_tune_devices(ide_hwif_t *hwif)
 static int ide_init_queue(ide_drive_t *drive)
 {
 	struct request_queue *q;
-	ide_hwif_t *hwif = HWIF(drive);
+	ide_hwif_t *hwif = drive->hwif;
 	int max_sectors = 256;
 	int max_sg_entries = PRD_ENTRIES;
 
@@ -918,36 +911,19 @@ static int ide_init_queue(ide_drive_t *drive)
 	return 0;
 }
 
-static void ide_add_drive_to_hwgroup(ide_drive_t *drive)
-{
-	ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
-
-	spin_lock_irq(&hwgroup->lock);
-	if (!hwgroup->drive) {
-		/* first drive for hwgroup. */
-		drive->next = drive;
-		hwgroup->drive = drive;
-		hwgroup->hwif = HWIF(hwgroup->drive);
-	} else {
-		drive->next = hwgroup->drive->next;
-		hwgroup->drive->next = drive;
-	}
-	spin_unlock_irq(&hwgroup->lock);
-}
+static DEFINE_MUTEX(ide_cfg_mtx);
 
 /*
  * For any present drive:
  * - allocate the block device queue
- * - link drive into the hwgroup
  */
 static int ide_port_setup_devices(ide_hwif_t *hwif)
 {
+	ide_drive_t *drive;
 	int i, j = 0;
 
 	mutex_lock(&ide_cfg_mtx);
-	for (i = 0; i < MAX_DRIVES; i++) {
-		ide_drive_t *drive = &hwif->drives[i];
-
+	ide_port_for_each_dev(i, drive, hwif) {
 		if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
 			continue;
 
@@ -961,139 +937,39 @@ static int ide_port_setup_devices(ide_hwif_t *hwif)
 		}
 
 		j++;
-
-		ide_add_drive_to_hwgroup(drive);
 	}
 	mutex_unlock(&ide_cfg_mtx);
 
 	return j;
 }
 
-static ide_hwif_t *ide_ports[MAX_HWIFS];
-
-void ide_remove_port_from_hwgroup(ide_hwif_t *hwif)
-{
-	ide_hwgroup_t *hwgroup = hwif->hwgroup;
-
-	ide_ports[hwif->index] = NULL;
-
-	spin_lock_irq(&hwgroup->lock);
-	/*
-	 * Remove us from the hwgroup, and free
-	 * the hwgroup if we were the only member
-	 */
-	if (hwif->next == hwif) {
-		BUG_ON(hwgroup->hwif != hwif);
-		kfree(hwgroup);
-	} else {
-		/* There is another interface in hwgroup.
-		 * Unlink us, and set hwgroup->drive and ->hwif to
-		 * something sane.
-		 */
-		ide_hwif_t *g = hwgroup->hwif;
-
-		while (g->next != hwif)
-			g = g->next;
-		g->next = hwif->next;
-		if (hwgroup->hwif == hwif) {
-			/* Chose a random hwif for hwgroup->hwif.
-			 * It's guaranteed that there are no drives
-			 * left in the hwgroup.
-			 */
-			BUG_ON(hwgroup->drive != NULL);
-			hwgroup->hwif = g;
-		}
-		BUG_ON(hwgroup->hwif == hwif);
-	}
-	spin_unlock_irq(&hwgroup->lock);
-}
-
 /*
- * This routine sets up the irq for an ide interface, and creates a new
- * hwgroup for the irq/hwif if none was previously assigned.
- *
- * Much of the code is for correctly detecting/handling irq sharing
- * and irq serialization situations.  This is somewhat complex because
- * it handles static as well as dynamic (PCMCIA) IDE interfaces.
+ * This routine sets up the IRQ for an IDE interface.
  */
 static int init_irq (ide_hwif_t *hwif)
 {
 	struct ide_io_ports *io_ports = &hwif->io_ports;
-	unsigned int index;
-	ide_hwgroup_t *hwgroup;
-	ide_hwif_t *match = NULL;
+	int sa = 0;
 
 	mutex_lock(&ide_cfg_mtx);
-	hwif->hwgroup = NULL;
+	spin_lock_init(&hwif->lock);
 
-	for (index = 0; index < MAX_HWIFS; index++) {
-		ide_hwif_t *h = ide_ports[index];
+	init_timer(&hwif->timer);
+	hwif->timer.function = &ide_timer_expiry;
+	hwif->timer.data = (unsigned long)hwif;
 
-		if (h && h->hwgroup) {  /* scan only initialized ports */
-			if (hwif->host->host_flags & IDE_HFLAG_SERIALIZE) {
-				if (hwif->host == h->host)
-					match = h;
-			}
-		}
-	}
-
-	/*
-	 * If we are still without a hwgroup, then form a new one
-	 */
-	if (match) {
-		hwgroup = match->hwgroup;
-		hwif->hwgroup = hwgroup;
-		/*
-		 * Link us into the hwgroup.
-		 * This must be done early, do ensure that unexpected_intr
-		 * can find the hwif and prevent irq storms.
-		 * No drives are attached to the new hwif, choose_drive
-		 * can't do anything stupid (yet).
-		 * Add ourself as the 2nd entry to the hwgroup->hwif
-		 * linked list, the first entry is the hwif that owns
-		 * hwgroup->handler - do not change that.
-		 */
-		spin_lock_irq(&hwgroup->lock);
-		hwif->next = hwgroup->hwif->next;
-		hwgroup->hwif->next = hwif;
-		BUG_ON(hwif->next == hwif);
-		spin_unlock_irq(&hwgroup->lock);
-	} else {
-		hwgroup = kmalloc_node(sizeof(*hwgroup), GFP_KERNEL|__GFP_ZERO,
-				       hwif_to_node(hwif));
-		if (hwgroup == NULL)
-			goto out_up;
-
-		spin_lock_init(&hwgroup->lock);
-
-		hwif->hwgroup = hwgroup;
-		hwgroup->hwif = hwif->next = hwif;
-
-		init_timer(&hwgroup->timer);
-		hwgroup->timer.function = &ide_timer_expiry;
-		hwgroup->timer.data = (unsigned long) hwgroup;
-	}
-
-	ide_ports[hwif->index] = hwif;
-
-	/*
-	 * Allocate the irq, if not already obtained for another hwif
-	 */
-	if (!match || match->irq != hwif->irq) {
-		int sa = 0;
 #if defined(__mc68000__)
-		sa = IRQF_SHARED;
+	sa = IRQF_SHARED;
 #endif /* __mc68000__ */
 
-		if (hwif->chipset == ide_pci)
-			sa = IRQF_SHARED;
+	if (hwif->chipset == ide_pci)
+		sa = IRQF_SHARED;
 
-		if (io_ports->ctl_addr)
-			hwif->tp_ops->set_irq(hwif, 1);
+	if (io_ports->ctl_addr)
+		hwif->tp_ops->set_irq(hwif, 1);
 
-		if (request_irq(hwif->irq,&ide_intr,sa,hwif->name,hwgroup))
-	       		goto out_unlink;
-	}
+	if (request_irq(hwif->irq, &ide_intr, sa, hwif->name, hwif))
+		goto out_up;
 
 	if (!hwif->rqsize) {
 		if ((hwif->host_flags & IDE_HFLAG_NO_LBA48) ||
@@ -1111,14 +987,12 @@ static int init_irq (ide_hwif_t *hwif)
 	printk(KERN_INFO "%s at 0x%08lx on irq %d", hwif->name,
 		io_ports->data_addr, hwif->irq);
 #endif /* __mc68000__ */
-	if (match)
-		printk(KERN_CONT " (serialized with %s)", match->name);
+	if (hwif->host->host_flags & IDE_HFLAG_SERIALIZE)
+		printk(KERN_CONT " (serialized)");
 	printk(KERN_CONT "\n");
 
 	mutex_unlock(&ide_cfg_mtx);
 	return 0;
-out_unlink:
-	ide_remove_port_from_hwgroup(hwif);
 out_up:
 	mutex_unlock(&ide_cfg_mtx);
 	return 1;
@@ -1134,7 +1008,7 @@ static struct kobject *ata_probe(dev_t dev, int *part, void *data)
 {
 	ide_hwif_t *hwif = data;
 	int unit = *part >> PARTN_BITS;
-	ide_drive_t *drive = &hwif->drives[unit];
+	ide_drive_t *drive = hwif->devices[unit];
 
 	if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
 		return NULL;
@@ -1196,47 +1070,23 @@ 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);
-	ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
+	ide_hwif_t *hwif = drive->hwif;
 
 	ide_proc_unregister_device(drive);
 
-	spin_lock_irq(&hwgroup->lock);
-	ide_remove_drive_from_hwgroup(drive);
+	spin_lock_irq(&hwif->lock);
 	kfree(drive->id);
 	drive->id = NULL;
 	drive->dev_flags &= ~IDE_DFLAG_PRESENT;
 	/* Messed up locking ... */
-	spin_unlock_irq(&hwgroup->lock);
+	spin_unlock_irq(&hwif->lock);
 	blk_cleanup_queue(drive->queue);
-	spin_lock_irq(&hwgroup->lock);
+	spin_lock_irq(&hwif->lock);
 	drive->queue = NULL;
-	spin_unlock_irq(&hwgroup->lock);
+	spin_unlock_irq(&hwif->lock);
 
 	complete(&drive->gendev_rel_comp);
 }
@@ -1302,10 +1152,10 @@ out:
 
 static void hwif_register_devices(ide_hwif_t *hwif)
 {
+	ide_drive_t *drive;
 	unsigned int i;
 
-	for (i = 0; i < MAX_DRIVES; i++) {
-		ide_drive_t *drive = &hwif->drives[i];
+	ide_port_for_each_dev(i, drive, hwif) {
 		struct device *dev = &drive->gendev;
 		int ret;
 
@@ -1328,11 +1178,10 @@ static void hwif_register_devices(ide_hwif_t *hwif)
 static void ide_port_init_devices(ide_hwif_t *hwif)
 {
 	const struct ide_port_ops *port_ops = hwif->port_ops;
+	ide_drive_t *drive;
 	int i;
 
-	for (i = 0; i < MAX_DRIVES; i++) {
-		ide_drive_t *drive = &hwif->drives[i];
-
+	ide_port_for_each_dev(i, drive, hwif) {
 		drive->dn = i + hwif->channel * 2;
 
 		if (hwif->host_flags & IDE_HFLAG_IO_32BIT)
@@ -1380,6 +1229,8 @@ static void ide_init_port(ide_hwif_t *hwif, unsigned int port,
 	if ((d->host_flags & IDE_HFLAG_NO_DMA) == 0) {
 		int rc;
 
+		hwif->dma_ops = d->dma_ops;
+
 		if (d->init_dma)
 			rc = d->init_dma(hwif, d);
 		else
@@ -1387,12 +1238,13 @@ static void ide_init_port(ide_hwif_t *hwif, unsigned int port,
 
 		if (rc < 0) {
 			printk(KERN_INFO "%s: DMA disabled\n", hwif->name);
+
+			hwif->dma_ops = NULL;
 			hwif->dma_base = 0;
 			hwif->swdma_mask = 0;
 			hwif->mwdma_mask = 0;
 			hwif->ultra_mask = 0;
-		} else if (d->dma_ops)
-			hwif->dma_ops = d->dma_ops;
+		}
 	}
 
 	if ((d->host_flags & IDE_HFLAG_SERIALIZE) ||
@@ -1417,6 +1269,66 @@ static void ide_port_cable_detect(ide_hwif_t *hwif)
 	}
 }
 
+static const u8 ide_hwif_to_major[] =
+	{ IDE0_MAJOR, IDE1_MAJOR, IDE2_MAJOR, IDE3_MAJOR, IDE4_MAJOR,
+	  IDE5_MAJOR, IDE6_MAJOR, IDE7_MAJOR, IDE8_MAJOR, IDE9_MAJOR };
+
+static void ide_port_init_devices_data(ide_hwif_t *hwif)
+{
+	ide_drive_t *drive;
+	int i;
+
+	ide_port_for_each_dev(i, drive, hwif) {
+		u8 j = (hwif->index * MAX_DRIVES) + i;
+
+		memset(drive, 0, sizeof(*drive));
+
+		drive->media			= ide_disk;
+		drive->select			= (i << 4) | ATA_DEVICE_OBS;
+		drive->hwif			= hwif;
+		drive->ready_stat		= ATA_DRDY;
+		drive->bad_wstat		= BAD_W_STAT;
+		drive->special.b.recalibrate	= 1;
+		drive->special.b.set_geometry	= 1;
+		drive->name[0]			= 'h';
+		drive->name[1]			= 'd';
+		drive->name[2]			= 'a' + j;
+		drive->max_failures		= IDE_DEFAULT_MAX_FAILURES;
+
+		INIT_LIST_HEAD(&drive->list);
+		init_completion(&drive->gendev_rel_comp);
+	}
+}
+
+static void ide_init_port_data(ide_hwif_t *hwif, unsigned int index)
+{
+	/* fill in any non-zero initial values */
+	hwif->index	= index;
+	hwif->major	= ide_hwif_to_major[index];
+
+	hwif->name[0]	= 'i';
+	hwif->name[1]	= 'd';
+	hwif->name[2]	= 'e';
+	hwif->name[3]	= '0' + index;
+
+	init_completion(&hwif->gendev_rel_comp);
+
+	hwif->tp_ops = &default_tp_ops;
+
+	ide_port_init_devices_data(hwif);
+}
+
+static void ide_init_port_hw(ide_hwif_t *hwif, hw_regs_t *hw)
+{
+	memcpy(&hwif->io_ports, &hw->io_ports, sizeof(hwif->io_ports));
+	hwif->irq = hw->irq;
+	hwif->chipset = hw->chipset;
+	hwif->dev = hw->dev;
+	hwif->gendev.parent = hw->parent ? hw->parent : hw->dev;
+	hwif->ack_intr = hw->ack_intr;
+	hwif->config_data = hw->config;
+}
+
 static unsigned int ide_indexes;
 
 /**
@@ -1466,12 +1378,43 @@ static void ide_free_port_slot(int idx)
 	mutex_unlock(&ide_cfg_mtx);
 }
 
+static void ide_port_free_devices(ide_hwif_t *hwif)
+{
+	ide_drive_t *drive;
+	int i;
+
+	ide_port_for_each_dev(i, drive, hwif)
+		kfree(drive);
+}
+
+static int ide_port_alloc_devices(ide_hwif_t *hwif, int node)
+{
+	int i;
+
+	for (i = 0; i < MAX_DRIVES; i++) {
+		ide_drive_t *drive;
+
+		drive = kzalloc_node(sizeof(*drive), GFP_KERNEL, node);
+		if (drive == NULL)
+			goto out_nomem;
+
+		hwif->devices[i] = drive;
+	}
+	return 0;
+
+out_nomem:
+	ide_port_free_devices(hwif);
+	return -ENOMEM;
+}
+
 struct ide_host *ide_host_alloc(const struct ide_port_info *d, hw_regs_t **hws)
 {
 	struct ide_host *host;
+	struct device *dev = hws[0] ? hws[0]->dev : NULL;
+	int node = dev ? dev_to_node(dev) : -1;
 	int i;
 
-	host = kzalloc(sizeof(*host), GFP_KERNEL);
+	host = kzalloc_node(sizeof(*host), GFP_KERNEL, node);
 	if (host == NULL)
 		return NULL;
 
@@ -1482,10 +1425,15 @@ struct ide_host *ide_host_alloc(const struct ide_port_info *d, hw_regs_t **hws)
 		if (hws[i] == NULL)
 			continue;
 
-		hwif = kzalloc(sizeof(*hwif), GFP_KERNEL);
+		hwif = kzalloc_node(sizeof(*hwif), GFP_KERNEL, node);
 		if (hwif == NULL)
 			continue;
 
+		if (ide_port_alloc_devices(hwif, node) < 0) {
+			kfree(hwif);
+			continue;
+		}
+
 		idx = ide_find_port_slot(d);
 		if (idx < 0) {
 			printk(KERN_ERR "%s: no free slot for interface\n",
@@ -1507,8 +1455,7 @@ struct ide_host *ide_host_alloc(const struct ide_port_info *d, hw_regs_t **hws)
 		return NULL;
 	}
 
-	if (hws[0])
-		host->dev[0] = hws[0]->dev;
+	host->dev[0] = dev;
 
 	if (d) {
 		host->init_chipset = d->init_chipset;
@@ -1525,9 +1472,7 @@ int ide_host_register(struct ide_host *host, const struct ide_port_info *d,
 	ide_hwif_t *hwif, *mate = NULL;
 	int i, j = 0;
 
-	for (i = 0; i < MAX_HOST_PORTS; i++) {
-		hwif = host->ports[i];
-
+	ide_host_for_each_port(i, hwif, host) {
 		if (hwif == NULL) {
 			mate = NULL;
 			continue;
@@ -1553,9 +1498,7 @@ int ide_host_register(struct ide_host *host, const struct ide_port_info *d,
 		ide_port_init_devices(hwif);
 	}
 
-	for (i = 0; i < MAX_HOST_PORTS; i++) {
-		hwif = host->ports[i];
-
+	ide_host_for_each_port(i, hwif, host) {
 		if (hwif == NULL)
 			continue;
 
@@ -1570,9 +1513,7 @@ int ide_host_register(struct ide_host *host, const struct ide_port_info *d,
 			ide_port_tune_devices(hwif);
 	}
 
-	for (i = 0; i < MAX_HOST_PORTS; i++) {
-		hwif = host->ports[i];
-
+	ide_host_for_each_port(i, hwif, host) {
 		if (hwif == NULL)
 			continue;
 
@@ -1597,9 +1538,7 @@ int ide_host_register(struct ide_host *host, const struct ide_port_info *d,
 			ide_acpi_port_init_devices(hwif);
 	}
 
-	for (i = 0; i < MAX_HOST_PORTS; i++) {
-		hwif = host->ports[i];
-
+	ide_host_for_each_port(i, hwif, host) {
 		if (hwif == NULL)
 			continue;
 
@@ -1607,9 +1546,7 @@ int ide_host_register(struct ide_host *host, const struct ide_port_info *d,
 			hwif_register_devices(hwif);
 	}
 
-	for (i = 0; i < MAX_HOST_PORTS; i++) {
-		hwif = host->ports[i];
-
+	ide_host_for_each_port(i, hwif, host) {
 		if (hwif == NULL)
 			continue;
 
@@ -1647,17 +1584,85 @@ int ide_host_add(const struct ide_port_info *d, hw_regs_t **hws,
 }
 EXPORT_SYMBOL_GPL(ide_host_add);
 
+static void __ide_port_unregister_devices(ide_hwif_t *hwif)
+{
+	ide_drive_t *drive;
+	int i;
+
+	ide_port_for_each_dev(i, drive, hwif) {
+		if (drive->dev_flags & IDE_DFLAG_PRESENT) {
+			device_unregister(&drive->gendev);
+			wait_for_completion(&drive->gendev_rel_comp);
+		}
+	}
+}
+
+void ide_port_unregister_devices(ide_hwif_t *hwif)
+{
+	mutex_lock(&ide_cfg_mtx);
+	__ide_port_unregister_devices(hwif);
+	hwif->present = 0;
+	ide_port_init_devices_data(hwif);
+	mutex_unlock(&ide_cfg_mtx);
+}
+EXPORT_SYMBOL_GPL(ide_port_unregister_devices);
+
+/**
+ *	ide_unregister		-	free an IDE interface
+ *	@hwif: IDE interface
+ *
+ *	Perform the final unregister of an IDE interface.
+ *
+ *	Locking:
+ *	The caller must not hold the IDE locks.
+ *
+ *	It is up to the caller to be sure there is no pending I/O here,
+ *	and that the interface will not be reopened (present/vanishing
+ *	locking isn't yet done BTW).
+ */
+
+static void ide_unregister(ide_hwif_t *hwif)
+{
+	BUG_ON(in_interrupt());
+	BUG_ON(irqs_disabled());
+
+	mutex_lock(&ide_cfg_mtx);
+
+	if (hwif->present) {
+		__ide_port_unregister_devices(hwif);
+		hwif->present = 0;
+	}
+
+	ide_proc_unregister_port(hwif);
+
+	free_irq(hwif->irq, hwif);
+
+	device_unregister(hwif->portdev);
+	device_unregister(&hwif->gendev);
+	wait_for_completion(&hwif->gendev_rel_comp);
+
+	/*
+	 * Remove us from the kernel's knowledge
+	 */
+	blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS);
+	kfree(hwif->sg_table);
+	unregister_blkdev(hwif->major, hwif->name);
+
+	ide_release_dma_engine(hwif);
+
+	mutex_unlock(&ide_cfg_mtx);
+}
+
 void ide_host_free(struct ide_host *host)
 {
 	ide_hwif_t *hwif;
 	int i;
 
-	for (i = 0; i < MAX_HOST_PORTS; i++) {
-		hwif = host->ports[i];
-
+	ide_host_for_each_port(i, hwif, host) {
 		if (hwif == NULL)
 			continue;
 
+		ide_port_free_devices(hwif);
 		ide_free_port_slot(hwif->index);
 		kfree(hwif);
 	}
@@ -1668,11 +1673,12 @@ EXPORT_SYMBOL_GPL(ide_host_free);
 
 void ide_host_remove(struct ide_host *host)
 {
+	ide_hwif_t *hwif;
 	int i;
 
-	for (i = 0; i < MAX_HOST_PORTS; i++) {
-		if (host->ports[i])
-			ide_unregister(host->ports[i]);
+	ide_host_for_each_port(i, hwif, host) {
+		if (hwif)
+			ide_unregister(hwif);
 	}
 
 	ide_host_free(host);
@@ -1691,8 +1697,8 @@ void ide_port_scan(ide_hwif_t *hwif)
 	hwif->present = 1;
 
 	ide_port_tune_devices(hwif);
-	ide_acpi_port_init_devices(hwif);
 	ide_port_setup_devices(hwif);
+	ide_acpi_port_init_devices(hwif);
 	hwif_register_devices(hwif);
 	ide_proc_port_register_devices(hwif);
 }