staging: comedi: usbduxsigma: fix the ai/ao cmd->start_arg use for TRIG_INT

For both ai and ao commands this driver supports a cmd->start_src of
TRIG_NOW or TRIG_INT. The cmd->start_arg is trivially validated for
both sources to be 0.

For a TRIG_INT source, the cmd->start_arg is actually the valid
trig_num that is used by the async (*inttrig) callback.

Refactor the (*inttrig) functions so that the cmd->start_arg is used
to check the trig_num instead of the open coded values.

For aesthetics, remove some unnecessary comments in the (*do_cmd)
functions.

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/usbduxsigma.c b/drivers/staging/comedi/drivers/usbduxsigma.c
index 88c60b6..b57c974 100644 (file)
--- a/drivers/staging/comedi/drivers/usbduxsigma.c
+++ b/drivers/staging/comedi/drivers/usbduxsigma.c
@@ -663,12 +663,13 @@ static int usbduxsigma_receive_cmd(struct comedi_device *dev, int command)
 
 static int usbduxsigma_ai_inttrig(struct comedi_device *dev,
                                  struct comedi_subdevice *s,
-                                 unsigned int trignum)
+                                 unsigned int trig_num)
 {
        struct usbduxsigma_private *devpriv = dev->private;
+       struct comedi_cmd *cmd = &s->async->cmd;
        int ret;
 
-       if (trignum != 0)
+       if (trig_num != cmd->start_arg)
                return -EINVAL;
 
        down(&devpriv->sem);
@@ -738,7 +739,6 @@ static int usbduxsigma_ai_cmd(struct comedi_device *dev,
                }
                s->async->inttrig = NULL;
        } else {        /* TRIG_INT */
-               /* wait for an internal signal and submit the urbs later */
                s->async->inttrig = usbduxsigma_ai_inttrig;
        }
 
@@ -856,12 +856,13 @@ static int usbduxsigma_ao_insn_write(struct comedi_device *dev,
 
 static int usbduxsigma_ao_inttrig(struct comedi_device *dev,
                                  struct comedi_subdevice *s,
-                                 unsigned int trignum)
+                                 unsigned int trig_num)
 {
        struct usbduxsigma_private *devpriv = dev->private;
+       struct comedi_cmd *cmd = &s->async->cmd;
        int ret;
 
-       if (trignum != 0)
+       if (trig_num != cmd->start_arg)
                return -EINVAL;
 
        down(&devpriv->sem);
@@ -1027,7 +1028,6 @@ static int usbduxsigma_ao_cmd(struct comedi_device *dev,
                }
                s->async->inttrig = NULL;
        } else {        /* TRIG_INT */
-               /* wait for an internal signal and submit the urbs later */
                s->async->inttrig = usbduxsigma_ao_inttrig;
        }