diff options
| -rw-r--r-- | drivers/staging/comedi/drivers/comedi_test.c | 42 |
1 files changed, 21 insertions, 21 deletions
diff --git a/drivers/staging/comedi/drivers/comedi_test.c b/drivers/staging/comedi/drivers/comedi_test.c index d9810ca..f011fbd 100644 --- a/drivers/staging/comedi/drivers/comedi_test.c +++ b/drivers/staging/comedi/drivers/comedi_test.c @@ -234,7 +234,7 @@ static int waveform_ai_cmdtest(struct comedi_device *dev, struct comedi_cmd *cmd) { int err = 0; - unsigned int arg; + unsigned int arg, limit; /* Step 1 : check if triggers are trivially valid */ @@ -265,16 +265,8 @@ static int waveform_ai_cmdtest(struct comedi_device *dev, if (cmd->convert_src == TRIG_NOW) err |= comedi_check_trigger_arg_is(&cmd->convert_arg, 0); - if (cmd->scan_begin_src == TRIG_TIMER) { - err |= comedi_check_trigger_arg_min(&cmd->scan_begin_arg, - NSEC_PER_USEC); - if (cmd->convert_src == TRIG_TIMER) { - err |= comedi_check_trigger_arg_min(&cmd-> - scan_begin_arg, - cmd->convert_arg * - cmd->chanlist_len); - } - } + err |= comedi_check_trigger_arg_min(&cmd->scan_begin_arg, + NSEC_PER_USEC); err |= comedi_check_trigger_arg_min(&cmd->chanlist_len, 1); err |= comedi_check_trigger_arg_is(&cmd->scan_end_arg, @@ -290,21 +282,29 @@ static int waveform_ai_cmdtest(struct comedi_device *dev, /* step 4: fix up any arguments */ - if (cmd->scan_begin_src == TRIG_TIMER) { - arg = cmd->scan_begin_arg; - /* round to nearest microsec */ - arg = NSEC_PER_USEC * - ((arg + (NSEC_PER_USEC / 2)) / NSEC_PER_USEC); - err |= comedi_check_trigger_arg_is(&cmd->scan_begin_arg, arg); - } if (cmd->convert_src == TRIG_TIMER) { + /* round convert_arg to nearest microsecond */ arg = cmd->convert_arg; - /* round to nearest microsec */ - arg = NSEC_PER_USEC * - ((arg + (NSEC_PER_USEC / 2)) / NSEC_PER_USEC); + arg = min(arg, + rounddown(UINT_MAX, (unsigned int)NSEC_PER_USEC)); + arg = NSEC_PER_USEC * DIV_ROUND_CLOSEST(arg, NSEC_PER_USEC); + /* limit convert_arg to keep scan_begin_arg in range */ + limit = UINT_MAX / cmd->scan_end_arg; + limit = rounddown(limit, (unsigned int)NSEC_PER_SEC); + arg = min(arg, limit); err |= comedi_check_trigger_arg_is(&cmd->convert_arg, arg); } + /* round scan_begin_arg to nearest microsecond */ + arg = cmd->scan_begin_arg; + arg = min(arg, rounddown(UINT_MAX, (unsigned int)NSEC_PER_USEC)); + arg = NSEC_PER_USEC * DIV_ROUND_CLOSEST(arg, NSEC_PER_USEC); + if (cmd->convert_src == TRIG_TIMER) { + /* but ensure scan_begin_arg is large enough */ + arg = max(arg, cmd->convert_arg * cmd->scan_end_arg); + } + err |= comedi_check_trigger_arg_is(&cmd->scan_begin_arg, arg); + if (err) return 4; |