diff --git a/drivers/ide/ide-probe.c b/drivers/ide/ide-probe.c
index e031686..b58eb79 100644
--- a/drivers/ide/ide-probe.c
+++ b/drivers/ide/ide-probe.c
@@ -1367,8 +1367,11 @@
 	if (hwif->chipset != ide_dtc2278 || hwif->channel == 0)
 		hwif->port_ops = d->port_ops;
 
-	if ((d->host_flags & IDE_HFLAG_SERIALIZE) && hwif->mate)
-		hwif->mate->serialized = hwif->serialized = 1;
+	if ((d->host_flags & IDE_HFLAG_SERIALIZE) ||
+	    ((d->host_flags & IDE_HFLAG_SERIALIZE_DMA) && hwif->dma_base)) {
+		if (hwif->mate)
+			hwif->mate->serialized = hwif->serialized = 1;
+	}
 
 	hwif->swdma_mask = d->swdma_mask;
 	hwif->mwdma_mask = d->mwdma_mask;
diff --git a/drivers/ide/pci/sl82c105.c b/drivers/ide/pci/sl82c105.c
index 2c2fe59..c2127cb 100644
--- a/drivers/ide/pci/sl82c105.c
+++ b/drivers/ide/pci/sl82c105.c
@@ -296,9 +296,6 @@
 	hwif->dma_start			= &sl82c105_dma_start;
 	hwif->ide_dma_end		= &sl82c105_dma_end;
 	hwif->dma_timeout		= &sl82c105_dma_timeout;
-
-	if (hwif->mate)
-		hwif->serialized = hwif->mate->serialized = 1;
 }
 
 static const struct ide_port_ops sl82c105_port_ops = {
@@ -319,6 +316,7 @@
 #if defined(CONFIG_LOPEC) || defined(CONFIG_SANDPOINT)
 			  IDE_HFLAG_FORCE_LEGACY_IRQS |
 #endif
+			  IDE_HFLAG_SERIALIZE_DMA |
 			  IDE_HFLAG_NO_AUTODMA,
 	.pio_mask	= ATA_PIO5,
 	.mwdma_mask	= ATA_MWDMA2,
@@ -338,6 +336,7 @@
 				 "revision %d, BM-DMA disabled\n", rev);
 		d.init_hwif = NULL;
 		d.mwdma_mask = 0;
+		d.host_flags &= ~IDE_HFLAG_SERIALIZE_DMA;
 	}
 
 	return ide_setup_pci_device(dev, &d);
diff --git a/include/linux/ide.h b/include/linux/ide.h
index 2da46af..e5f4174 100644
--- a/include/linux/ide.h
+++ b/include/linux/ide.h
@@ -1087,6 +1087,8 @@
 	/* unmask IRQs */
 	IDE_HFLAG_UNMASK_IRQS		= (1 << 25),
 	IDE_HFLAG_ABUSE_SET_DMA_MODE	= (1 << 26),
+	/* serialize ports if DMA is possible (for sl82c105) */
+	IDE_HFLAG_SERIALIZE_DMA		= (1 << 27),
 	/* force host out of "simplex" mode */
 	IDE_HFLAG_CLEAR_SIMPLEX		= (1 << 28),
 	/* DSC overlap is unsupported */