Commit c6208c2f authored by Ian Abbott's avatar Ian Abbott Committed by Greg Kroah-Hartman

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: default avatarIan Abbott <abbotti@mev.co.uk>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 86aff4bb
......@@ -9,11 +9,23 @@
#if NI_LABPC_HAVE_ISA_DMA
static inline bool labpc_have_dma_chan(struct comedi_device *dev)
{
struct labpc_private *devpriv = dev->private;
return (bool)devpriv->dma_chan;
}
int labpc_init_dma_chan(struct comedi_device *dev, unsigned int dma_chan);
void labpc_free_dma_chan(struct comedi_device *dev);
#else
static inline bool labpc_have_dma_chan(struct comedi_device *dev)
{
return false;
}
static inline int labpc_init_dma_chan(struct comedi_device *dev,
unsigned int dma_chan)
{
......
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