staging: comedi: mite: introduce mite_sync_dma()

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The struct mite_channel 'dir' member specifies if the dma is input
or output. Wrap the mite_sync_input_dma() and mite_sync_output_dma()
functions with a single mite_sync_dma() so that the drivers don't
have to worry about the sync direction.

The functions that actually sync the input/output dma currently return
-1 if an overflow/underrun is detected otherwise they return 0. If an
overflow/underrun is detected the async->event COMEDI_CB_OVERFLOW is
also set.

The callers never check the return value anyway so just make the
functions return void. The async->event can be checked if necessary
to detect any errors.

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>

...

This commit is contained in:

H Hartley Sweeten 2016-04-20 10:36:39 -07:00 • committed by Greg Kroah-Hartman

parent 33b0b6913d

commit 51d430056c

6 changed files with 30 additions and 32 deletions

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43

drivers/staging/comedi/drivers/mite.c

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5

drivers/staging/comedi/drivers/mite.h

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2

drivers/staging/comedi/drivers/ni_660x.c

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6

drivers/staging/comedi/drivers/ni_mio_common.c

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4

drivers/staging/comedi/drivers/ni_pcidio.c

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2

drivers/staging/comedi/drivers/ni_tiocmd.c

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