diff options
| author | H Hartley Sweeten <hartleys@visionengravers.com> | 2015-01-12 10:55:49 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-01-17 14:25:19 -0800 |
| commit | b1478901b677dd430f4e97989f7f6e2dc8e54556 (patch) | |
| tree | 60c79f707bdbe4626344166577c27ae39c79d4c8 /drivers/staging/comedi/drivers/ni_at_a2150.c | |
| parent | 7cbb0ef93a63f7c0574d852607af71f348ccc751 (diff) | |
staging: comedi: ni_at_a2150: introduce a2150_free_dma()
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>
Diffstat (limited to 'drivers/staging/comedi/drivers/ni_at_a2150.c')
| -rw-r--r-- | drivers/staging/comedi/drivers/ni_at_a2150.c | 20 |
1 files changed, 13 insertions, 7 deletions
diff --git a/drivers/staging/comedi/drivers/ni_at_a2150.c b/drivers/staging/comedi/drivers/ni_at_a2150.c index 11b168156a6a..de2e87780de9 100644 --- a/drivers/staging/comedi/drivers/ni_at_a2150.c +++ b/drivers/staging/comedi/drivers/ni_at_a2150.c @@ -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); }; |