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staging: comedi: ni_at_a2150: introduce a2150_free_dma()

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For aesthetics, introduce a helper function to free the DMA channel and
buffer.

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 10:55:49 -07:00
committed by Greg Kroah-Hartman
parent 7cbb0ef93a
commit b1478901b6
1 changed files with 13 additions and 7 deletions
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20
drivers/staging/comedi/drivers/ni_at_a2150.c
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@@ -720,6 +720,18 @@ static void a2150_alloc_irq_dma(struct comedi_device *dev,
set_dma_mode(dma_chan, DMA_MODE_READ);
}
static void a2150_free_dma(struct comedi_device *dev)
{
struct a2150_private *devpriv = dev->private;
if (!devpriv)
return;
if (devpriv->dma)
free_dma(devpriv->dma);
kfree(devpriv->dma_buffer);
}
/* probes board type, returns offset */
static int a2150_probe(struct comedi_device *dev)
{
@@ -808,15 +820,9 @@ static int a2150_attach(struct comedi_device *dev, struct comedi_devconfig *it)
static void a2150_detach(struct comedi_device *dev)
{
struct a2150_private *devpriv = dev->private;
if (dev->iobase)
outw(APD_BIT | DPD_BIT, dev->iobase + CONFIG_REG);
if (devpriv) {
if (devpriv->dma)
free_dma(devpriv->dma);
kfree(devpriv->dma_buffer);
}
a2150_free_dma(dev);
comedi_legacy_detach(dev);
};