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staging: comedi: pcl818: introduce pcl818_dma_free()

Browse source 
For aesthetics, move the freeing of the DMA channel and the buffers to
a helper function.

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>
This commit is contained in:
H Hartley Sweeten 2015-01-12 10:55:56 -07:00 • committed by Greg Kroah-Hartman
commit 665ee190c9
1 changed files with 17 additions and 6 deletions
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23
drivers/staging/comedi/drivers/pcl818.c
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@ -1082,6 +1082,22 @@ static int pcl818_alloc_dma(struct comedi_device *dev, unsigned int dma_chan)
return 0;
}
static void pcl818_free_dma(struct comedi_device *dev)
{
struct pcl818_private *devpriv = dev->private;
int i;
if (!devpriv)
return;
if (devpriv->dma)
free_dma(devpriv->dma);
for (i = 0; i < 2; i++) {
if (devpriv->dmabuf[i])
free_pages(devpriv->dmabuf[i], devpriv->dmapages);
}
}
static int pcl818_attach(struct comedi_device *dev, struct comedi_devconfig *it)
{
const struct pcl818_board *board = dev->board_ptr;
@ -1217,13 +1233,8 @@ static void pcl818_detach(struct comedi_device *dev)
if (devpriv) {
pcl818_ai_cancel(dev, dev->read_subdev);
pcl818_reset(dev);
if (devpriv->dma)
free_dma(devpriv->dma);
if (devpriv->dmabuf[0])
free_pages(devpriv->dmabuf[0], devpriv->dmapages);
if (devpriv->dmabuf[1])
free_pages(devpriv->dmabuf[1], devpriv->dmapages);
}
pcl818_free_dma(dev);
comedi_legacy_detach(dev);
}