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| author | Ian Abbott <abbotti@mev.co.uk> | 2018-10-30 14:44:16 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-11-07 13:05:39 +0100 |
| commit | 43818b03c518b7aed6bbe95ce2bcd4c5aaed2473 (patch) | |
| tree | 8751325f55d22122d04dbf5445fb74870cdc6a35 /drivers/staging/comedi | |
| parent | 48164754d7fe219911b7653449a4ce85d23c3556 (diff) | |
| download | linux-43818b03c518b7aed6bbe95ce2bcd4c5aaed2473.tar.bz2 | |
staging: comedi: cb_pcidda: Use insn->n in AO insn_write handler
The `insn_write` handler for the AO subdevice
(`cb_pcidda_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
`cb_pcidda_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/cb_pcidda.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/staging/comedi/drivers/cb_pcidda.c b/drivers/staging/comedi/drivers/cb_pcidda.c index 807a31e75883..1d09dd265ab7 100644 --- a/drivers/staging/comedi/drivers/cb_pcidda.c +++ b/drivers/staging/comedi/drivers/cb_pcidda.c @@ -291,6 +291,7 @@ static int cb_pcidda_ao_insn_write(struct comedi_device *dev, unsigned int channel = CR_CHAN(insn->chanspec); unsigned int range = CR_RANGE(insn->chanspec); unsigned int ctrl; + unsigned int i; if (range != devpriv->ao_range[channel]) cb_pcidda_calibrate(dev, channel, range); @@ -317,7 +318,8 @@ static int cb_pcidda_ao_insn_write(struct comedi_device *dev, outw(ctrl, devpriv->daqio + CB_DDA_DA_CTRL_REG); - outw(data[0], devpriv->daqio + CB_DDA_DA_DATA_REG(channel)); + for (i = 0; i < insn->n; i++) + outw(data[i], devpriv->daqio + CB_DDA_DA_DATA_REG(channel)); return insn->n; } |