staging: comedi: das800: use comedi_fc helpers to validate timer args

Use the comedi_fc helper cfc_check_trigger_arg_is() to validate the
trigger arguments when the source is TRIG_TIMER.

All the arguments are unsigned int, change the local variable to an
unsigned int and rename it for aesthetic reasons.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/comedi/drivers/das800.c b/drivers/staging/comedi/drivers/das800.c
index 615ae3f..38f6a6d 100644 (file)
--- a/drivers/staging/comedi/drivers/das800.c
+++ b/drivers/staging/comedi/drivers/das800.c
@@ -331,6 +331,7 @@ static int das800_ai_do_cmdtest(struct comedi_device *dev,
        const struct das800_board *thisboard = comedi_board(dev);
        struct das800_private *devpriv = dev->private;
        int err = 0;
+       unsigned int arg;
 
        /* Step 1 : check if triggers are trivially valid */
 
@@ -376,15 +377,12 @@ static int das800_ai_do_cmdtest(struct comedi_device *dev,
        /* step 4: fix up any arguments */
 
        if (cmd->convert_src == TRIG_TIMER) {
-               int tmp = cmd->convert_arg;
-
-               /* calculate counter values that give desired timing */
+               arg = cmd->convert_arg;
                i8253_cascade_ns_to_timer(I8254_OSC_BASE_1MHZ,
                                          &devpriv->divisor1,
                                          &devpriv->divisor2,
-                                         &cmd->convert_arg, cmd->flags);
-               if (tmp != cmd->convert_arg)
-                       err++;
+                                         &arg, cmd->flags);
+               err |= cfc_check_trigger_arg_is(&cmd->convert_arg, arg);
        }
 
        if (err)