From: H Hartley Sweeten Date: Wed, 24 Jul 2013 17:00:45 +0000 (-0700) Subject: staging: comedi: range: tidy up comedi_check_chanlist() X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=065b09127057fa728c9290d62c2a2e1c4925132b;p=linux-beck.git staging: comedi: range: tidy up comedi_check_chanlist() The only difference in the if() and else if() check of the chanlist is the source of the range table length. Consolidate the checks to make the function a bit more concise. Signed-off-by: H Hartley Sweeten Reviewed-by: Ian Abbott Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/staging/comedi/range.c b/drivers/staging/comedi/range.c index 1f20332cc459..8fde55495d34 100644 --- a/drivers/staging/comedi/range.c +++ b/drivers/staging/comedi/range.c @@ -127,38 +127,35 @@ static int aref_invalid(struct comedi_subdevice *s, unsigned int chanspec) return 1; } -/* - This function checks each element in a channel/gain list to make - make sure it is valid. +/** + * comedi_check_chanlist() - Validate each element in a chanlist. + * @s: comedi_subdevice struct + * @n: number of elements in the chanlist + * @chanlist: the chanlist to validate */ int comedi_check_chanlist(struct comedi_subdevice *s, int n, unsigned int *chanlist) { struct comedi_device *dev = s->device; - int i; - int chan; + unsigned int chanspec; + int chan, range_len, i; - if (s->range_table) { - for (i = 0; i < n; i++) - if (CR_CHAN(chanlist[i]) >= s->n_chan || - CR_RANGE(chanlist[i]) >= s->range_table->length - || aref_invalid(s, chanlist[i])) { - dev_warn(dev->class_dev, - "bad chanlist[%d]=0x%08x in_chan=%d range length=%d\n", - i, chanlist[i], s->n_chan, - s->range_table->length); - return -EINVAL; - } - } else if (s->range_table_list) { + if (s->range_table || s->range_table_list) { for (i = 0; i < n; i++) { - chan = CR_CHAN(chanlist[i]); + chanspec = chanlist[i]; + chan = CR_CHAN(chanspec); + if (s->range_table) + range_len = s->range_table->length; + else if (s->range_table_list && chan < s->n_chan) + range_len = s->range_table_list[chan]->length; + else + range_len = 0; if (chan >= s->n_chan || - CR_RANGE(chanlist[i]) >= - s->range_table_list[chan]->length - || aref_invalid(s, chanlist[i])) { + CR_RANGE(chanspec) >= range_len || + aref_invalid(s, chanspec)) { dev_warn(dev->class_dev, - "bad chanlist[%d]=0x%08x\n", - i, chanlist[i]); + "bad chanlist[%d]=0x%08x chan=%d range length=%d\n", + i, chanspec, chan, range_len); return -EINVAL; } }