diff --git a/drivers/staging/comedi/drivers/ni_labpc.c b/drivers/staging/comedi/drivers/ni_labpc.c
index e8fc6a1c629a..56fb5b2136a4 100644
--- a/drivers/staging/comedi/drivers/ni_labpc.c
+++ b/drivers/staging/comedi/drivers/ni_labpc.c
@@ -1588,7 +1588,7 @@ static int labpc_eeprom_insn_read(struct comedi_device *dev,
 }
 
 int labpc_common_attach(struct comedi_device *dev,
-			unsigned int irq, unsigned int dma_chan)
+			unsigned int irq)
 {
 	const struct labpc_boardinfo *board = comedi_board(dev);
 	struct labpc_private *devpriv = dev->private;
@@ -1626,27 +1626,6 @@ int labpc_common_attach(struct comedi_device *dev,
 			dev->irq = irq;
 	}
 
-#ifdef CONFIG_ISA_DMA_API
-	if (dev->irq && (dma_chan == 1 || dma_chan == 3)) {
-		devpriv->dma_buffer = kmalloc(dma_buffer_size,
-					      GFP_KERNEL | GFP_DMA);
-		if (devpriv->dma_buffer) {
-			ret = request_dma(dma_chan, dev->board_name);
-			if (ret == 0) {
-				unsigned long dma_flags;
-
-				devpriv->dma_chan = dma_chan;
-				dma_flags = claim_dma_lock();
-				disable_dma(devpriv->dma_chan);
-				set_dma_mode(devpriv->dma_chan, DMA_MODE_READ);
-				release_dma_lock(dma_flags);
-			} else {
-				kfree(devpriv->dma_buffer);
-			}
-		}
-	}
-#endif
-
 	ret = comedi_alloc_subdevices(dev, 5);
 	if (ret)
 		return ret;
@@ -1759,7 +1738,32 @@ static int labpc_attach(struct comedi_device *dev, struct comedi_devconfig *it)
 	if (ret)
 		return ret;
 
-	return labpc_common_attach(dev, irq, dma_chan);
+	ret = labpc_common_attach(dev, irq);
+	if (ret)
+		return ret;
+
+#ifdef CONFIG_ISA_DMA_API
+	if (dev->irq && (dma_chan == 1 || dma_chan == 3)) {
+		devpriv->dma_buffer = kmalloc(dma_buffer_size,
+					      GFP_KERNEL | GFP_DMA);
+		if (devpriv->dma_buffer) {
+			ret = request_dma(dma_chan, dev->board_name);
+			if (ret == 0) {
+				unsigned long dma_flags;
+
+				devpriv->dma_chan = dma_chan;
+				dma_flags = claim_dma_lock();
+				disable_dma(devpriv->dma_chan);
+				set_dma_mode(devpriv->dma_chan, DMA_MODE_READ);
+				release_dma_lock(dma_flags);
+			} else {
+				kfree(devpriv->dma_buffer);
+			}
+		}
+	}
+#endif
+
+	return 0;
 }
 
 void labpc_detach(struct comedi_device *dev)
diff --git a/drivers/staging/comedi/drivers/ni_labpc.h b/drivers/staging/comedi/drivers/ni_labpc.h
index e214bb9237b3..7f8a82851634 100644
--- a/drivers/staging/comedi/drivers/ni_labpc.h
+++ b/drivers/staging/comedi/drivers/ni_labpc.h
@@ -101,7 +101,7 @@ struct labpc_private {
 };
 
 int labpc_common_attach(struct comedi_device *dev,
-			unsigned int irq, unsigned int dma);
+			unsigned int irq);
 void labpc_common_detach(struct comedi_device *dev);
 
 extern const int labpc_1200_ai_gain_bits[];
diff --git a/drivers/staging/comedi/drivers/ni_labpc_cs.c b/drivers/staging/comedi/drivers/ni_labpc_cs.c
index f9cb9cf1655a..4b4a72df18e7 100644
--- a/drivers/staging/comedi/drivers/ni_labpc_cs.c
+++ b/drivers/staging/comedi/drivers/ni_labpc_cs.c
@@ -111,7 +111,7 @@ static int labpc_auto_attach(struct comedi_device *dev,
 		return -ENOMEM;
 	dev->private = devpriv;
 
-	return labpc_common_attach(dev, link->irq, 0);
+	return labpc_common_attach(dev, link->irq);
 }
 
 static void labpc_detach(struct comedi_device *dev)
diff --git a/drivers/staging/comedi/drivers/ni_labpc_pci.c b/drivers/staging/comedi/drivers/ni_labpc_pci.c
index 82e381fe34ee..13ae267f1824 100644
--- a/drivers/staging/comedi/drivers/ni_labpc_pci.c
+++ b/drivers/staging/comedi/drivers/ni_labpc_pci.c
@@ -92,7 +92,7 @@ static int labpc_pci_auto_attach(struct comedi_device *dev,
 		return ret;
 	dev->iobase = (unsigned long)devpriv->mite->daq_io_addr;
 
-	return labpc_common_attach(dev, mite_irq(devpriv->mite), 0);
+	return labpc_common_attach(dev, mite_irq(devpriv->mite));
 }
 
 static void labpc_pci_detach(struct comedi_device *dev)