staging: comedi: me4000: remove 'board' from me4000_ai_insn_read()

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The 'board' pointer is only used in this function to verify that the
'chan' is valid for an aref of AREF_DIFF. For differential inputs, the
maximum channel is half the subdevice 'n_chan'. Use that instead and
remove the 'board' variable.

Also, the comedi core does not validate the aref flags. Add a check
to ensure that the subdevice actually supports the AREF_DIFF mode.

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 2015-08-05 10:44:42 -07:00 • committed by Greg Kroah-Hartman

parent 03611e5491

commit 1a02387063

1 changed files with 10 additions and 4 deletions

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drivers/staging/comedi/drivers/me4000.c

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