staging: comedi: das1800: introduce das1800_free_dma()

For aesthetics, introduce a helper function to free the DMA channels and
allocated buffers.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/comedi/drivers/das1800.c b/drivers/staging/comedi/drivers/das1800.c
index dd46a91..1eb5eab 100644 (file)
--- a/drivers/staging/comedi/drivers/das1800.c
+++ b/drivers/staging/comedi/drivers/das1800.c
@@ -1303,6 +1303,25 @@ static int das1800_init_dma(struct comedi_device *dev,
        return 0;
 }
 
+static void das1800_free_dma(struct comedi_device *dev)
+{
+       struct das1800_private *devpriv = dev->private;
+       struct das1800_dma_desc *dma;
+       int i;
+
+       if (!devpriv)
+               return;
+
+       for (i = 0; i < 2; i++) {
+               dma = &devpriv->dma_desc[i];
+               if (dma->chan)
+                       free_dma(dma->chan);
+               if (dma->virt_addr)
+                       dma_free_coherent(NULL, DMA_BUF_SIZE,
+                                         dma->virt_addr, dma->hw_addr);
+       }
+}
+
 static int das1800_probe(struct comedi_device *dev)
 {
        const struct das1800_board *board = dev->board_ptr;
@@ -1514,18 +1533,9 @@ static int das1800_attach(struct comedi_device *dev,
 static void das1800_detach(struct comedi_device *dev)
 {
        struct das1800_private *devpriv = dev->private;
-       struct das1800_dma_desc *dma;
-       int i;
 
+       das1800_free_dma(dev);
        if (devpriv) {
-               for (i = 0; i < 2; i++) {
-                       dma = &devpriv->dma_desc[i];
-                       if (dma->chan)
-                               free_dma(dma->chan);
-                       if (dma->virt_addr)
-                               dma_free_coherent(NULL, DMA_BUF_SIZE,
-                                                 dma->virt_addr, dma->hw_addr);
-               }
                kfree(devpriv->fifo_buf);
                if (devpriv->iobase2)
                        release_region(devpriv->iobase2, DAS1800_SIZE);