staging: comedi: pcl818: introduce pcl818_isadma_disable()

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According to Documentation/DMA-ISA-LPC.txt, the DMA lock needs to be
claimed before using any of the ISA DMA routines. Introduce a helper
function to disable the ISA DMA controller and add the necessary
locking calls.

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>

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H Hartley Sweeten 2015-01-13 10:16:21 -07:00 • committed by Greg Kroah-Hartman

parent 9cf2765f5e

commit bed8d5381c

1 changed files with 12 additions and 3 deletions

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drivers/staging/comedi/drivers/pcl818.c

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