diff options
| -rw-r--r-- | drivers/comedi/drivers/multiq3.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/comedi/drivers/multiq3.c b/drivers/comedi/drivers/multiq3.c index 07ff5383da99..ac369e9a262d 100644 --- a/drivers/comedi/drivers/multiq3.c +++ b/drivers/comedi/drivers/multiq3.c @@ -67,6 +67,11 @@ #define MULTIQ3_TRSFRCNTR_OL 0x10 /* xfer CNTR to OL (x and y) */ #define MULTIQ3_EFLAG_RESET 0x06 /* reset E bit of flag reg */ +/* + * Limit on the number of optional encoder channels + */ +#define MULTIQ3_MAX_ENC_CHANS 8 + static void multiq3_set_ctrl(struct comedi_device *dev, unsigned int bits) { /* @@ -312,6 +317,10 @@ static int multiq3_attach(struct comedi_device *dev, s->insn_read = multiq3_encoder_insn_read; s->insn_config = multiq3_encoder_insn_config; + /* sanity check for number of encoder channels */ + if (s->n_chan > MULTIQ3_MAX_ENC_CHANS) + s->n_chan = MULTIQ3_MAX_ENC_CHANS; + for (i = 0; i < s->n_chan; i++) multiq3_encoder_reset(dev, i); |