staging: comedi: comedi_isadma: Use a non-NULL device for DMA API

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The "comedi_isadma" module calls `dma_alloc_coherent()` and
`dma_free_coherent()` with a NULL device pointer which is no longer
allowed.  If the `hw_dev` member of the `struct comedi_device` has been
set to a valid device, that can be used instead.  Unfortunately, all the
current users of the "comedi_isadma" module leave the `hw_dev` member
set to NULL.  In that case, fall back to using the comedi "class" device
pointed to by the `class_dev` member if that is non-NULL.  In that case,
make it "DMA-capable" with a coherent DMA mask set to the ISA bus limit
of 16MB (24 bits).

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Ian Abbott 2019-04-26 14:54:13 +01:00 • committed by Greg Kroah-Hartman

parent 575d927c42

commit a4965d98b4

2 changed files with 18 additions and 2 deletions

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17

drivers/staging/comedi/drivers/comedi_isadma.c

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3

drivers/staging/comedi/drivers/comedi_isadma.h

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