staging: comedi: ni_labpc_isadma: add labpc_have_dma_chan()

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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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Ian Abbott 2013-06-28 17:09:21 +01:00 • committed by Greg Kroah-Hartman

parent 86aff4bb11

commit c6208c2f35

1 changed files with 12 additions and 0 deletions

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drivers/staging/comedi/drivers/ni_labpc_isadma.h

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