staging: comedi: ni_labpc_isadma: add labpc_have_dma_chan()
Add a static inline function to "ni_labpc_isadma.h" to test if a DMA channel has been set-up, in which case `devpriv->dma_chan` will be non-zero (where `devpriv` point to the private data for the comedi device). If the "ni_labpc_isadma" module is not being built, don't bother checking `devpriv->dma_chan`; just return `false` as this may help the compiler to optimize out some unreachable code. Signed-off-by: Ian Abbott <abbotti@mev.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -9,11 +9,23 @@
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#if NI_LABPC_HAVE_ISA_DMA
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#if NI_LABPC_HAVE_ISA_DMA
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static inline bool labpc_have_dma_chan(struct comedi_device *dev)
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{
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struct labpc_private *devpriv = dev->private;
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return (bool)devpriv->dma_chan;
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}
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int labpc_init_dma_chan(struct comedi_device *dev, unsigned int dma_chan);
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int labpc_init_dma_chan(struct comedi_device *dev, unsigned int dma_chan);
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void labpc_free_dma_chan(struct comedi_device *dev);
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void labpc_free_dma_chan(struct comedi_device *dev);
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#else
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#else
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static inline bool labpc_have_dma_chan(struct comedi_device *dev)
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{
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return false;
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}
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static inline int labpc_init_dma_chan(struct comedi_device *dev,
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static inline int labpc_init_dma_chan(struct comedi_device *dev,
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unsigned int dma_chan)
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unsigned int dma_chan)
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{
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{
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