diff options
| author | Ian Abbott <abbotti@mev.co.uk> | 2018-10-30 17:23:54 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-11-07 13:05:39 +0100 |
| commit | 4a4c1b1d5a1d1f083ea9a9fe8b179bfa9e62e12a (patch) | |
| tree | 28c21bacabd9a07a2308b2f33c15565454201fd0 /drivers/staging/comedi | |
| parent | 43818b03c518b7aed6bbe95ce2bcd4c5aaed2473 (diff) | |
staging: comedi: ni_labpc_common: Use insn->n in AO insn_write handler
The `insn_write` handler for the AO subdevice (`labpc_ao_insn_write()`)
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 `labpc_ao_insn_write()` 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>
Diffstat (limited to 'drivers/staging/comedi')
| -rw-r--r-- | drivers/staging/comedi/drivers/ni_labpc_common.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/drivers/staging/comedi/drivers/ni_labpc_common.c b/drivers/staging/comedi/drivers/ni_labpc_common.c index 7fa2d39562db..406952f5521d 100644 --- a/drivers/staging/comedi/drivers/ni_labpc_common.c +++ b/drivers/staging/comedi/drivers/ni_labpc_common.c @@ -906,7 +906,9 @@ static int labpc_ao_insn_write(struct comedi_device *dev, { const struct labpc_boardinfo *board = dev->board_ptr; struct labpc_private *devpriv = dev->private; - int channel, range; + unsigned int channel; + unsigned int range; + unsigned int i; unsigned long flags; channel = CR_CHAN(insn->chanspec); @@ -932,9 +934,10 @@ static int labpc_ao_insn_write(struct comedi_device *dev, devpriv->write_byte(dev, devpriv->cmd6, CMD6_REG); } /* send data */ - labpc_ao_write(dev, s, channel, data[0]); + for (i = 0; i < insn->n; i++) + labpc_ao_write(dev, s, channel, data[i]); - return 1; + return insn->n; } /* lowlevel write to eeprom/dac */ |