diff --git a/[refs] b/[refs]
index d75847c71cee..fefe45f55c15 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 0a438d5b381e2bdfd5e02d653bf46fcc878356e3
+refs/heads/master: 1581a03573e6c9ebd931e31f9172cce25dcb69e6
diff --git a/trunk/drivers/staging/comedi/drivers/ni_labpc.c b/trunk/drivers/staging/comedi/drivers/ni_labpc.c
index 3d978f34d212..77a7bb632580 100644
--- a/trunk/drivers/staging/comedi/drivers/ni_labpc.c
+++ b/trunk/drivers/staging/comedi/drivers/ni_labpc.c
@@ -976,8 +976,7 @@ static int labpc_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
 		/* clear flip-flop to make sure 2-byte registers for
 		 * count and address get set correctly */
 		clear_dma_ff(devpriv->dma_chan);
-		set_dma_addr(devpriv->dma_chan,
-			     virt_to_bus(devpriv->dma_buffer));
+		set_dma_addr(devpriv->dma_chan, devpriv->dma_addr);
 		/*  set appropriate size of transfer */
 		devpriv->dma_transfer_size = labpc_suggest_transfer_size(cmd);
 		if (cmd->stop_src == TRIG_COUNT &&
@@ -1089,7 +1088,7 @@ static void labpc_drain_dma(struct comedi_device *dev)
 		devpriv->count -= num_points;
 
 	/*  set address and count for next transfer */
-	set_dma_addr(devpriv->dma_chan, virt_to_bus(devpriv->dma_buffer));
+	set_dma_addr(devpriv->dma_chan, devpriv->dma_addr);
 	set_dma_count(devpriv->dma_chan, leftover * sample_size);
 	release_dma_lock(flags);
 
@@ -1741,6 +1740,9 @@ static int labpc_attach(struct comedi_device *dev, struct comedi_devconfig *it)
 				unsigned long dma_flags;
 
 				devpriv->dma_chan = dma_chan;
+				devpriv->dma_addr =
+					virt_to_bus(devpriv->dma_buffer);
+
 				dma_flags = claim_dma_lock();
 				disable_dma(devpriv->dma_chan);
 				set_dma_mode(devpriv->dma_chan, DMA_MODE_READ);
diff --git a/trunk/drivers/staging/comedi/drivers/ni_labpc.h b/trunk/drivers/staging/comedi/drivers/ni_labpc.h
index 615f16f271c0..4b691f5a9965 100644
--- a/trunk/drivers/staging/comedi/drivers/ni_labpc.h
+++ b/trunk/drivers/staging/comedi/drivers/ni_labpc.h
@@ -82,6 +82,7 @@ struct labpc_private {
 	unsigned int divisor_b1;
 	unsigned int dma_chan;	/*  dma channel to use */
 	u16 *dma_buffer;	/*  buffer ai will dma into */
+	phys_addr_t dma_addr;
 	/* transfer size in bytes for current transfer */
 	unsigned int dma_transfer_size;
 	/* we are using dma/fifo-half-full/etc. */