staging: comedi: cb_pcidas64: Use insn->n in AO insn_write handler

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The `insn_write` handler for the AO subdevice (`ao_winsn()` currently
ignores `insn->n` (the number of samples to write) and assumes a single
sample is to be written.  But `insn->n` could be 0, meaning no samples
should be written, in which case `data[0]` is invalid.

Follow the usual Comedi guidelines and change `ao_winsn()` to write the
specified number of samples.  This fixes the assumption that `data[0]`
is valid.

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

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Ian Abbott 2018-10-30 14:17:11 +00:00 • committed by Greg Kroah-Hartman

parent fafb85b45f

commit 130151991d

1 changed files with 19 additions and 13 deletions

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drivers/staging/comedi/drivers/cb_pcidas64.c

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