staging: comedi: rtd520: 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.

Use cfc_check_trigger_arg_min() to vaidate the scan_begin_arg when the
scan_begin_src and convert_src are both 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/rtd520.c b/drivers/staging/comedi/drivers/rtd520.c
index 28402d2f92a2e9efc94212349baf66e57ac17b29..d55c5893203ba3a6be29a9d63ef5012e13b7d5e2 100644 (file)
--- a/drivers/staging/comedi/drivers/rtd520.c
+++ b/drivers/staging/comedi/drivers/rtd520.c
@@ -779,7 +779,7 @@ static int rtd_ai_cmdtest(struct comedi_device *dev,
                          struct comedi_subdevice *s, struct comedi_cmd *cmd)
 {
        int err = 0;
-       int tmp;
+       unsigned int arg;
 
        /* Step 1 : check if triggers are trivially valid */
 
@@ -894,26 +894,20 @@ static int rtd_ai_cmdtest(struct comedi_device *dev,
        /* step 4: fix up any arguments */
 
        if (cmd->scan_begin_src == TRIG_TIMER) {
-               tmp = cmd->scan_begin_arg;
-               rtd_ns_to_timer(&cmd->scan_begin_arg,
-                               cmd->flags & TRIG_ROUND_MASK);
-               if (tmp != cmd->scan_begin_arg)
-                       err++;
-
+               arg = cmd->scan_begin_arg;
+               rtd_ns_to_timer(&arg, cmd->flags & TRIG_ROUND_MASK);
+               err |= cfc_check_trigger_arg_is(&cmd->scan_begin_arg, arg);
        }
+
        if (cmd->convert_src == TRIG_TIMER) {
-               tmp = cmd->convert_arg;
-               rtd_ns_to_timer(&cmd->convert_arg,
-                               cmd->flags & TRIG_ROUND_MASK);
-               if (tmp != cmd->convert_arg)
-                       err++;
-
-               if (cmd->scan_begin_src == TRIG_TIMER
-                   && (cmd->scan_begin_arg
-                       < (cmd->convert_arg * cmd->scan_end_arg))) {
-                       cmd->scan_begin_arg =
-                           cmd->convert_arg * cmd->scan_end_arg;
-                       err++;
+               arg = cmd->convert_arg;
+               rtd_ns_to_timer(&arg, cmd->flags & TRIG_ROUND_MASK);
+               err |= cfc_check_trigger_arg_is(&cmd->convert_arg, arg);
+
+               if (cmd->scan_begin_src == TRIG_TIMER) {
+                       arg = cmd->convert_arg * cmd->scan_end_arg;
+                       err |= cfc_check_trigger_arg_min(&cmd->scan_begin_arg,
+                                                        arg);
                }
        }