staging: comedi: ni_mio_common: use insn->n in ni_calib_insn_read()

Browse source

The `insn_read` handler for the calibration subdevice
(`ni_calib_insn_read()`) currently ignores `insn->n` (the number of
samples to read) and assumes a single sample is to be read into
`data[0]`.  Fortunately, the Comedi core ensures that `data[]` has a
length of at least 16, so there is no problem with array bounds.

The usual Comedi convention for `insn_read` handlers is to read the same
channel `insn->n` times into successive elements of `data[]`, so let's
do that.

Also, follow the usual Comedi convention and return `insn->n` from the
handler to indicate success (although any non-negative value will do).

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

...

This commit is contained in:

Ian Abbott 2019-03-19 16:54:42 +00:00 • committed by Greg Kroah-Hartman

parent fe57d1e113

commit 776d25ff5b

1 changed files with 4 additions and 2 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

6

drivers/staging/comedi/drivers/ni_mio_common.c

View file