[PATCH 6/9] staging: comedi: usbduxfast: TRIG_EXT only works for 1 or 16 channels

[H Hartley Sweeten]

Move this check from the (*do_cmd) to the (*do_cmdtest).

Signed-off-by: H Hartley Sweeten <hsweeten at visionengravers.com>
Cc: Ian Abbott <abbotti at mev.co.uk>
Cc: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
---
 drivers/staging/comedi/drivers/usbduxfast.c | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/drivers/staging/comedi/drivers/usbduxfast.c b/drivers/staging/comedi/drivers/usbduxfast.c
index 45060b9..407f091 100644
--- a/drivers/staging/comedi/drivers/usbduxfast.c
+++ b/drivers/staging/comedi/drivers/usbduxfast.c
@@ -389,6 +389,11 @@ static int usbduxfast_ai_cmdtest(struct comedi_device *dev,
 	if (cmd->start_src == TRIG_EXT && cmd->stop_src == TRIG_EXT)
 		err |= -EINVAL;
 
+	/* external start trigger is only valid for 1 or 16 channels */
+	if (cmd->start_src == TRIG_EXT &&
+	    cmd->chanlist_len != 1 && cmd->chanlist_len != 16)
+		err |= -EINVAL;
+
 	if (err)
 		return 2;
 
@@ -519,13 +524,6 @@ static int usbduxfast_ai_cmd(struct comedi_device *dev,
 		up(&devpriv->sem);
 		return -EINVAL;
 	}
-	if ((cmd->start_src == TRIG_EXT) && (cmd->chanlist_len != 1)
-	    && (cmd->chanlist_len != 16)) {
-		dev_err(dev->class_dev,
-			"TRIG_EXT only with 1 or 16 channels possible\n");
-		up(&devpriv->sem);
-		return -EINVAL;
-	}
 
 	switch (cmd->chanlist_len) {
 	case 1:
-- 
2.4.3