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

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

drivers/staging/comedi/drivers/ni_labpc_isadma.h

+12 −0
Original line number Diff line number Diff line
@@ -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)

{