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staging: comedi: comedi_isadma.h: make self-reliant
The Comedi "comedi_isadma.h" header is included by the source for the "comedi_isadma" helper module and other modules that use it. It does not compile cleanly when it is the first header file included. It uses the `dma_addr_t` type, so include <linux/types.h> to declare it. (Also, that indirectly takes care of the use of `NULL`.) It uses `struct comedi_device *` in various function prototypes, so add an incomplete declaration of `struct comedi_device`. Signed-off-by: Ian Abbott <abbotti@mev.co.uk> Reviewed-by: H Hartley Sweeten <hsweeten@visionengravers.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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#ifndef _COMEDI_ISADMA_H
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#define _COMEDI_ISADMA_H
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#include <linux/types.h>
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struct comedi_device;
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/*
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* These are used to avoid issues when <asm/dma.h> and the DMA_MODE_
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* defines are not available.
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