diff --git a/drivers/ide/pci/aec62xx.c b/drivers/ide/pci/aec62xx.c
index e7475ba..c294b19 100644
--- a/drivers/ide/pci/aec62xx.c
+++ b/drivers/ide/pci/aec62xx.c
@@ -115,7 +115,7 @@
 	struct pci_dev *dev	= to_pci_dev(hwif->dev);
 	struct ide_host *host	= pci_get_drvdata(dev);
 	struct chipset_bus_clock_list_entry *bus_clock = host->host_priv;
-	u8 unit		= (drive->select.b.unit & 0x01);
+	u8 unit			= drive->dn & 1;
 	u8 tmp1 = 0, tmp2 = 0;
 	u8 ultra = 0, drive_conf = 0, ultra_conf = 0;
 	unsigned long flags;
diff --git a/drivers/ide/pci/alim15x3.c b/drivers/ide/pci/alim15x3.c
index 053c752..f1c57f7 100644
--- a/drivers/ide/pci/alim15x3.c
+++ b/drivers/ide/pci/alim15x3.c
@@ -77,8 +77,7 @@
 	int bus_speed = ide_pci_clk ? ide_pci_clk : 33;
 	int port = hwif->channel ? 0x5c : 0x58;
 	int portFIFO = hwif->channel ? 0x55 : 0x54;
-	u8 cd_dma_fifo = 0;
-	int unit = drive->select.b.unit & 1;
+	u8 cd_dma_fifo = 0, unit = drive->dn & 1;
 
 	if ((s_clc = (s_time * bus_speed + 999) / 1000) >= 8)
 		s_clc = 0;
@@ -112,7 +111,7 @@
 	}
 	
 	pci_write_config_byte(dev, port, s_clc);
-	pci_write_config_byte(dev, port+drive->select.b.unit+2, (a_clc << 4) | r_clc);
+	pci_write_config_byte(dev, port + unit + 2, (a_clc << 4) | r_clc);
 	local_irq_restore(flags);
 }
 
@@ -154,7 +153,7 @@
 	ide_hwif_t *hwif	= HWIF(drive);
 	struct pci_dev *dev	= to_pci_dev(hwif->dev);
 	u8 speed1		= speed;
-	u8 unit			= (drive->select.b.unit & 0x01);
+	u8 unit			= drive->dn & 1;
 	u8 tmpbyte		= 0x00;
 	int m5229_udma		= (hwif->channel) ? 0x57 : 0x56;
 
diff --git a/drivers/ide/pci/cmd640.c b/drivers/ide/pci/cmd640.c
index d3afdff..e430664 100644
--- a/drivers/ide/pci/cmd640.c
+++ b/drivers/ide/pci/cmd640.c
@@ -468,7 +468,7 @@
 	 */
 	if (index > 1) {
 		ide_hwif_t *hwif = drive->hwif;
-		ide_drive_t *peer = &hwif->drives[!drive->select.b.unit];
+		ide_drive_t *peer = &hwif->drives[!(drive->dn & 1)];
 		unsigned int mate = index ^ 1;
 
 		if (peer->dev_flags & IDE_DFLAG_PRESENT) {
@@ -607,7 +607,7 @@
 
 static void cmd640_init_dev(ide_drive_t *drive)
 {
-	unsigned int i = drive->hwif->channel * 2 + drive->select.b.unit;
+	unsigned int i = drive->hwif->channel * 2 + (drive->dn & 1);
 
 #ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
 	/*
diff --git a/drivers/ide/pci/cs5535.c b/drivers/ide/pci/cs5535.c
index 1e5bc59..fa6dca9 100644
--- a/drivers/ide/pci/cs5535.c
+++ b/drivers/ide/pci/cs5535.c
@@ -76,7 +76,7 @@
 static void cs5535_set_speed(ide_drive_t *drive, const u8 speed)
 {
 	u32 reg = 0, dummy;
-	int unit = drive->select.b.unit;
+	u8 unit = drive->dn & 1;
 
 	/* Set the PIO timings */
 	if (speed < XFER_SW_DMA_0) {
diff --git a/drivers/ide/pci/cy82c693.c b/drivers/ide/pci/cy82c693.c
index 5241ef7..e5f8fc0 100644
--- a/drivers/ide/pci/cy82c693.c
+++ b/drivers/ide/pci/cy82c693.c
@@ -178,8 +178,7 @@
 
 #if CY82C693_DEBUG_INFO
 	printk(KERN_INFO "%s (ch=%d, dev=%d): set DMA mode to %d (single=%d)\n",
-		drive->name, HWIF(drive)->channel, drive->select.b.unit,
-		mode & 3, single);
+		drive->name, hwif->channel, drive->dn & 1, mode & 3, single);
 #endif /* CY82C693_DEBUG_INFO */
 
 	/*
@@ -224,7 +223,7 @@
 	compute_clocks(pio, &pclk);
 
 	/* now let's write  the clocks registers */
-	if (drive->select.b.unit == 0) {
+	if ((drive->dn & 1) == 0) {
 		/*
 		 * set master drive
 		 * address setup control register
@@ -266,7 +265,7 @@
 #if CY82C693_DEBUG_INFO
 	printk(KERN_INFO "%s (ch=%d, dev=%d): set PIO timing to "
 		"(addr=0x%X, ior=0x%X, iow=0x%X, 8bit=0x%X)\n",
-		drive->name, hwif->channel, drive->select.b.unit,
+		drive->name, hwif->channel, drive->dn & 1,
 		addrCtrl, pclk.time_16r, pclk.time_16w, pclk.time_8);
 #endif /* CY82C693_DEBUG_INFO */
 }
diff --git a/drivers/ide/pci/it821x.c b/drivers/ide/pci/it821x.c
index b761015..1aada44 100644
--- a/drivers/ide/pci/it821x.c
+++ b/drivers/ide/pci/it821x.c
@@ -138,8 +138,7 @@
 	struct pci_dev *dev = to_pci_dev(hwif->dev);
 	struct it821x_dev *itdev = ide_get_hwifdata(hwif);
 	int channel = hwif->channel;
-	int unit = drive->select.b.unit;
-	u8 conf;
+	u8 unit = drive->dn & 1, conf;
 
 	/* Program UDMA timing bits */
 	if(itdev->clock_mode == ATA_66)
@@ -168,13 +167,11 @@
 	ide_hwif_t *hwif = drive->hwif;
 	struct pci_dev *dev = to_pci_dev(hwif->dev);
 	struct it821x_dev *itdev = ide_get_hwifdata(hwif);
+	ide_drive_t *pair;
+	int clock, altclock, sel = 0;
+	u8 unit = drive->dn & 1, v;
 
-	u8 unit = drive->select.b.unit;
-	ide_drive_t *pair = &hwif->drives[1-unit];
-
-	int clock, altclock;
-	u8 v;
-	int sel = 0;
+	pair = &hwif->drives[1 - unit];
 
 	if(itdev->want[0][0] > itdev->want[1][0]) {
 		clock = itdev->want[0][1];
@@ -240,16 +237,17 @@
 
 static void it821x_set_pio_mode(ide_drive_t *drive, const u8 pio)
 {
-	ide_hwif_t *hwif	= drive->hwif;
+	ide_hwif_t *hwif = drive->hwif;
 	struct it821x_dev *itdev = ide_get_hwifdata(hwif);
-	int unit = drive->select.b.unit;
-	ide_drive_t *pair = &hwif->drives[1 - unit];
-	u8 set_pio = pio;
+	ide_drive_t *pair;
+	u8 unit = drive->dn & 1, set_pio = pio;
 
 	/* Spec says 89 ref driver uses 88 */
 	static u16 pio_timings[]= { 0xAA88, 0xA382, 0xA181, 0x3332, 0x3121 };
 	static u8 pio_want[]    = { ATA_66, ATA_66, ATA_66, ATA_66, ATA_ANY };
 
+	pair = &hwif->drives[1 - unit];
+
 	/*
 	 * Compute the best PIO mode we can for a given device. We must
 	 * pick a speed that does not cause problems with the other device
@@ -286,9 +284,7 @@
 	ide_hwif_t *hwif = drive->hwif;
 	struct pci_dev *dev = to_pci_dev(hwif->dev);
 	struct it821x_dev *itdev = (void *)ide_get_hwifdata(hwif);
-	int unit = drive->select.b.unit;
-	int channel = hwif->channel;
-	u8 conf;
+	u8 unit = drive->dn & 1, channel = hwif->channel, conf;
 
 	static u16 dma[]	= { 0x8866, 0x3222, 0x3121 };
 	static u8 mwdma_want[]	= { ATA_ANY, ATA_66, ATA_ANY };
@@ -325,9 +321,7 @@
 	ide_hwif_t *hwif = drive->hwif;
 	struct pci_dev *dev = to_pci_dev(hwif->dev);
 	struct it821x_dev *itdev = ide_get_hwifdata(hwif);
-	int unit = drive->select.b.unit;
-	int channel = hwif->channel;
-	u8 conf;
+	u8 unit = drive->dn & 1, channel = hwif->channel, conf;
 
 	static u16 udma[]	= { 0x4433, 0x4231, 0x3121, 0x2121, 0x1111, 0x2211, 0x1111 };
 	static u8 udma_want[]	= { ATA_ANY, ATA_50, ATA_ANY, ATA_66, ATA_66, ATA_50, ATA_66 };
@@ -369,7 +363,8 @@
 {
 	ide_hwif_t *hwif = drive->hwif;
 	struct it821x_dev *itdev = ide_get_hwifdata(hwif);
-	int unit = drive->select.b.unit;
+	u8 unit = drive->dn & 1;
+
 	if(itdev->mwdma[unit] != MWDMA_OFF)
 		it821x_program(drive, itdev->mwdma[unit]);
 	else if(itdev->udma[unit] != UDMA_OFF && itdev->timing10)
@@ -389,9 +384,10 @@
 static int it821x_dma_end(ide_drive_t *drive)
 {
 	ide_hwif_t *hwif = drive->hwif;
-	int unit = drive->select.b.unit;
 	struct it821x_dev *itdev = ide_get_hwifdata(hwif);
 	int ret = __ide_dma_end(drive);
+	u8 unit = drive->dn & 1;
+
 	if(itdev->mwdma[unit] != MWDMA_OFF)
 		it821x_program(drive, itdev->pio[unit]);
 	return ret;
diff --git a/drivers/ide/pci/ns87415.c b/drivers/ide/pci/ns87415.c
index 99e98e5..61a1436 100644
--- a/drivers/ide/pci/ns87415.c
+++ b/drivers/ide/pci/ns87415.c
@@ -160,8 +160,8 @@
 		new |= bit;
 
 	/* Select PIO or DMA, DMA may only be selected for one drive/channel. */
-	bit   = 1 << (20 + drive->select.b.unit       + (hwif->channel << 1));
-	other = 1 << (20 + (1 - drive->select.b.unit) + (hwif->channel << 1));
+	bit   = 1 << (20 + (drive->dn & 1) + (hwif->channel << 1));
+	other = 1 << (20 + (1 - (drive->dn & 1)) + (hwif->channel << 1));
 	new = use_dma ? ((new & ~other) | bit) : (new & ~bit);
 
 	if (new != *old) {
diff --git a/drivers/ide/pci/opti621.c b/drivers/ide/pci/opti621.c
index 3de11dd..f0db38b 100644
--- a/drivers/ide/pci/opti621.c
+++ b/drivers/ide/pci/opti621.c
@@ -179,7 +179,7 @@
 	misc = addr_timings[clk][addr_pio];
 
 	/* select Index-0/1 for Register-A/B */
-	write_reg(drive->select.b.unit, MISC_REG);
+	write_reg(drive->dn & 1, MISC_REG);
 	/* set read cycle timings */
 	write_reg(tim, READ_REG);
 	/* set write cycle timings */
diff --git a/drivers/ide/pci/sc1200.c b/drivers/ide/pci/sc1200.c
index 50405ed..79eeead 100644
--- a/drivers/ide/pci/sc1200.c
+++ b/drivers/ide/pci/sc1200.c
@@ -126,7 +126,6 @@
 {
 	ide_hwif_t		*hwif = HWIF(drive);
 	struct pci_dev		*dev = to_pci_dev(hwif->dev);
-	int			unit = drive->select.b.unit;
 	unsigned int		reg, timings;
 	unsigned short		pci_clock;
 	unsigned int		basereg = hwif->channel ? 0x50 : 0x40;
@@ -155,7 +154,7 @@
 	else
 		timings = mwdma_timing[pci_clock][mode - XFER_MW_DMA_0];
 
-	if (unit == 0) {			/* are we configuring drive0? */
+	if ((drive->dn & 1) == 0) {
 		pci_read_config_dword(dev, basereg + 4, &reg);
 		timings |= reg & 0x80000000;	/* preserve PIO format bit */
 		pci_write_config_dword(dev, basereg + 4, timings);
diff --git a/drivers/ide/pci/scc_pata.c b/drivers/ide/pci/scc_pata.c
index 62fa314..0eced0a 100644
--- a/drivers/ide/pci/scc_pata.c
+++ b/drivers/ide/pci/scc_pata.c
@@ -291,7 +291,7 @@
 static void scc_dma_host_set(ide_drive_t *drive, int on)
 {
 	ide_hwif_t *hwif = drive->hwif;
-	u8 unit = (drive->select.b.unit & 0x01);
+	u8 unit = drive->dn & 1;
 	u8 dma_stat = scc_ide_inb(hwif->dma_base + 4);
 
 	if (on)
diff --git a/drivers/ide/pci/serverworks.c b/drivers/ide/pci/serverworks.c
index 3dff2ae..7fac801 100644
--- a/drivers/ide/pci/serverworks.c
+++ b/drivers/ide/pci/serverworks.c
@@ -153,7 +153,7 @@
 
 	ide_hwif_t *hwif	= HWIF(drive);
 	struct pci_dev *dev	= to_pci_dev(hwif->dev);
-	u8 unit			= (drive->select.b.unit & 0x01);
+	u8 unit			= drive->dn & 1;
 
 	u8 ultra_enable	 = 0, ultra_timing = 0, dma_timing = 0;
 
diff --git a/drivers/ide/pci/siimage.c b/drivers/ide/pci/siimage.c
index 174a873..134868c 100644
--- a/drivers/ide/pci/siimage.c
+++ b/drivers/ide/pci/siimage.c
@@ -116,13 +116,14 @@
 {
 	ide_hwif_t *hwif	= HWIF(drive);
 	unsigned long base	= (unsigned long)hwif->hwif_data;
+	u8 unit			= drive->dn & 1;
 
 	base += 0xA0 + r;
 	if (hwif->host_flags & IDE_HFLAG_MMIO)
 		base += hwif->channel << 6;
 	else
 		base += hwif->channel << 4;
-	base |= drive->select.b.unit << drive->select.b.unit;
+	base |= unit << unit;
 	return base;
 }
 
@@ -255,7 +256,7 @@
 	u8 addr_mask		= hwif->channel ? (mmio ? 0xF4 : 0x84)
 						: (mmio ? 0xB4 : 0x80);
 	u8 mode			= 0;
-	u8 unit			= drive->select.b.unit;
+	u8 unit			= drive->dn & 1;
 
 	/* trim *taskfile* PIO to the slowest of the master/slave */
 	if (pair) {
@@ -301,9 +302,9 @@
 
 	ide_hwif_t *hwif	= HWIF(drive);
 	struct pci_dev *dev	= to_pci_dev(hwif->dev);
-	u16 ultra = 0, multi	= 0;
-	u8 mode = 0, unit	= drive->select.b.unit;
 	unsigned long base	= (unsigned long)hwif->hwif_data;
+	u16 ultra = 0, multi	= 0;
+	u8 mode = 0, unit	= drive->dn & 1;
 	u8 mmio			= (hwif->host_flags & IDE_HFLAG_MMIO) ? 1 : 0;
 	u8 scsc = 0, addr_mask	= hwif->channel ? (mmio ? 0xF4 : 0x84)
 						: (mmio ? 0xB4 : 0x80);
diff --git a/drivers/ide/pci/triflex.c b/drivers/ide/pci/triflex.c
index be8715d..42fb98f 100644
--- a/drivers/ide/pci/triflex.c
+++ b/drivers/ide/pci/triflex.c
@@ -38,13 +38,12 @@
 {
 	ide_hwif_t *hwif = HWIF(drive);
 	struct pci_dev *dev = to_pci_dev(hwif->dev);
-	u8 channel_offset = hwif->channel ? 0x74 : 0x70;
-	u16 timing = 0;
 	u32 triflex_timings = 0;
-	u8 unit = (drive->select.b.unit & 0x01);
-	
+	u16 timing = 0;
+	u8 channel_offset = hwif->channel ? 0x74 : 0x70, unit = drive->dn & 1;
+
 	pci_read_config_dword(dev, channel_offset, &triflex_timings);
-	
+
 	switch(speed) {
 		case XFER_MW_DMA_2:
 			timing = 0x0103;