diff options
| -rw-r--r-- | drivers/staging/comedi/drivers/me4000.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/drivers/staging/comedi/drivers/me4000.c b/drivers/staging/comedi/drivers/me4000.c index 335fafc73a94..008929e8d3fe 100644 --- a/drivers/staging/comedi/drivers/me4000.c +++ b/drivers/staging/comedi/drivers/me4000.c @@ -568,8 +568,6 @@ static int me4000_ai_check_chanlist(struct comedi_device *dev, struct comedi_subdevice *s, struct comedi_cmd *cmd) { - const struct me4000_board *board = dev->board_ptr; - unsigned int max_diff_chan = board->ai_diff_nchan; unsigned int aref0 = CR_AREF(cmd->chanlist[0]); int i; @@ -585,7 +583,13 @@ static int me4000_ai_check_chanlist(struct comedi_device *dev, } if (aref == AREF_DIFF) { - if (chan >= max_diff_chan) { + if (!(s->subdev_flags && SDF_DIFF)) { + dev_err(dev->class_dev, + "Differential inputs are not available\n"); + return -EINVAL; + } + + if (chan >= (s->n_chan / 2)) { dev_dbg(dev->class_dev, "Channel number to high\n"); return -EINVAL; |