staging: comedi: pcl816: use comedi_fc helpers to validate timer arg

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

The minimum test is not needed, this was already validated in Step 3.

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/pcl816.c b/drivers/staging/comedi/drivers/pcl816.c
index 1260122ee7abae8e2079fe70f7398361c338d789..3742f5f78fc636a1ef777c9fbb5dfa517d47d10d 100644 (file)
--- a/drivers/staging/comedi/drivers/pcl816.c
+++ b/drivers/staging/comedi/drivers/pcl816.c
@@ -370,7 +370,7 @@ static int pcl816_ai_cmdtest(struct comedi_device *dev,
 {
        struct pcl816_private *devpriv = dev->private;
        int err = 0;
-       int tmp;
+       unsigned int arg;
 
        /* Step 1 : check if triggers are trivially valid */
 
@@ -417,15 +417,12 @@ static int pcl816_ai_cmdtest(struct comedi_device *dev,
 
        /* step 4: fix up any arguments */
        if (cmd->convert_src == TRIG_TIMER) {
-               tmp = cmd->convert_arg;
+               arg = cmd->convert_arg;
                i8253_cascade_ns_to_timer(I8254_OSC_BASE_10MHZ,
                                          &devpriv->divisor1,
                                          &devpriv->divisor2,
-                                         &cmd->convert_arg, cmd->flags);
-               if (cmd->convert_arg < 10000)
-                       cmd->convert_arg = 10000;
-               if (tmp != cmd->convert_arg)
-                       err++;
+                                         &arg, cmd->flags);
+               err |= cfc_check_trigger_arg_is(&cmd->convert_arg, arg);
        }
 
        if (err)