diff --git a/drivers/ide/cmd64x.c b/drivers/ide/cmd64x.c
index 935385c77e062d12e6ad6061942dfcdd5cbbdd8d..3623bf013bcfde7a2249d743091317da7bd87bad 100644
--- a/drivers/ide/cmd64x.c
+++ b/drivers/ide/cmd64x.c
@@ -424,10 +424,10 @@ static const struct ide_port_info cmd64x_chipsets[] __devinitdata = {
 		.name		= DRV_NAME,
 		.init_chipset	= init_chipset_cmd64x,
 		.enablebits	= {{0x51,0x04,0x04}, {0x51,0x08,0x08}},
-		.chipset	= ide_cmd646,
 		.port_ops	= &cmd64x_port_ops,
 		.dma_ops	= &cmd648_dma_ops,
-		.host_flags	= IDE_HFLAG_ABUSE_PREFETCH,
+		.host_flags	= IDE_HFLAG_SERIALIZE |
+				  IDE_HFLAG_ABUSE_PREFETCH,
 		.pio_mask	= ATA_PIO5,
 		.mwdma_mask	= ATA_MWDMA2,
 		.udma_mask	= ATA_UDMA2,
diff --git a/drivers/ide/ide-probe.c b/drivers/ide/ide-probe.c
index b0f9ededfad72613ff6d801f3e1a0bc0feb02f68..a0eb72e2a026486a9017a4081877d46c8e10fdeb 100644
--- a/drivers/ide/ide-probe.c
+++ b/drivers/ide/ide-probe.c
@@ -1125,7 +1125,7 @@ static int init_irq (ide_hwif_t *hwif)
 		sa = IRQF_SHARED;
 #endif /* __mc68000__ */
 
-		if (hwif->chipset == ide_pci || hwif->chipset == ide_cmd646)
+		if (hwif->chipset == ide_pci)
 			sa = IRQF_SHARED;
 
 		if (io_ports->ctl_addr)
diff --git a/drivers/ide/ide-proc.c b/drivers/ide/ide-proc.c
index dd899e1f38412f4e43b2e68d4c6594c021179867..e41669eec2c2e65585123b92aa040ec72798d758 100644
--- a/drivers/ide/ide-proc.c
+++ b/drivers/ide/ide-proc.c
@@ -48,7 +48,6 @@ static int proc_ide_read_imodel
 	case ide_ht6560b:	name = "ht6560b";	break;
 	case ide_rz1000:	name = "rz1000";	break;
 	case ide_trm290:	name = "trm290";	break;
-	case ide_cmd646:	name = "cmd646";	break;
 	case ide_cy82c693:	name = "cy82c693";	break;
 	case ide_4drives:	name = "4drives";	break;
 	case ide_pmac:		name = "mac-io";	break;
diff --git a/include/linux/ide.h b/include/linux/ide.h
index 0b8af0535d85a3f862d441ed8d15d3502bd19126..150e42311ee0c08b7abb1ef2cf0c3f201b39f5e7 100644
--- a/include/linux/ide.h
+++ b/include/linux/ide.h
@@ -171,7 +171,7 @@ enum {		ide_unknown,	ide_generic,	ide_pci,
 		ide_cmd640,	ide_dtc2278,	ide_ali14xx,
 		ide_qd65xx,	ide_umc8672,	ide_ht6560b,
 		ide_rz1000,	ide_trm290,
-		ide_cmd646,	ide_cy82c693,	ide_4drives,
+		ide_cy82c693,	ide_4drives,
 		ide_pmac,	ide_acorn,
 		ide_au1xxx,	ide_palm3710
 };