diff -u -r linux-2.5.44-vanilla/drivers/ide/ide-dma.c linux-2.5.44/drivers/ide/ide-dma.c
--- linux-2.5.44-vanilla/drivers/ide/ide-dma.c	2002-10-21 08:02:49.000000000 -0500
+++ linux-2.5.44/drivers/ide/ide-dma.c	2002-10-21 08:56:49.000000000 -0500
@@ -905,7 +905,12 @@
 		request_region(base+16, hwif->cds->extra, hwif->cds->name);
 		hwif->dma_extra = hwif->cds->extra;
 	}
-	hwif->dma_master = (hwif->channel) ? hwif->mate->dma_base : base;
+	if(!hwif->mate && hwif->channel){
+		hwif->dma_master=base;
+	}
+	else{
+		hwif->dma_master = (hwif->channel) ? hwif->mate->dma_base : base;
+	}
 	if (hwif->dma_base2) {
 		if (!check_mem_region(hwif->dma_base2, ports))
 			request_mem_region(hwif->dma_base2, ports, hwif->name);
@@ -925,8 +930,13 @@
 	if ((hwif->cds->extra) && (hwif->channel == 0)) {
 		request_region(base+16, hwif->cds->extra, hwif->cds->name);
 		hwif->dma_extra = hwif->cds->extra;
+	}	
+	if(!hwif->mate && hwif->channel){
+		hwif->dma_master=base;
+	}
+	else{
+		hwif->dma_master = (hwif->channel) ? hwif->mate->dma_base : base;
 	}
-	hwif->dma_master = (hwif->channel) ? hwif->mate->dma_base : base;
 	if (hwif->dma_base2) {
 		if (!request_region(hwif->dma_base2, ports, hwif->name))
 		{