[PATCH 44/51 v2] staging: comedi: ni_labpc: dma requires an interrupt

[H Hartley Sweeten]

DMA support only works if an interrupt is available.

Signed-off-by: H Hartley Sweeten <hsweeten at visionengravers.com>
Cc: Ian Abbott <abbotti at mev.co.uk>
Cc: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
---
 drivers/staging/comedi/drivers/ni_labpc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/comedi/drivers/ni_labpc.c b/drivers/staging/comedi/drivers/ni_labpc.c
index 744db1f..926c4f1 100644
--- a/drivers/staging/comedi/drivers/ni_labpc.c
+++ b/drivers/staging/comedi/drivers/ni_labpc.c
@@ -1673,7 +1673,7 @@ int labpc_common_attach(struct comedi_device *dev, unsigned long iobase,
 	}
 
 #ifdef CONFIG_ISA_DMA_API
-	if (dma_chan == 1 || dma_chan == 3) {
+	if (dev->irq && (dma_chan == 1 || dma_chan == 3)) {
 		devpriv->dma_buffer = kmalloc(dma_buffer_size,
 					      GFP_KERNEL | GFP_DMA);
 		if (devpriv->dma_buffer) {
-- 
1.8.1.4