From: H Hartley Sweeten <hsweeten@visionengravers.com>
Date: Wed, 5 Aug 2015 17:44:40 +0000 (-0700)
Subject: staging: comedi: me4000: only set SDF_DIFF when supported
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=31bebc030fb2a6e2e7e7ea19ce58a0f196280281;p=linux-beck.git

staging: comedi: me4000: only set SDF_DIFF when supported

Some of the boards supported by this driver do not have differential analog
inputs. Only set the SDF_DIFF subdev_flag when the board supports it.

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/me4000.c b/drivers/staging/comedi/drivers/me4000.c
index 3d45217e9e18..171749b06ef2 100644
--- a/drivers/staging/comedi/drivers/me4000.c
+++ b/drivers/staging/comedi/drivers/me4000.c
@@ -1284,7 +1284,9 @@ static int me4000_auto_attach(struct comedi_device *dev,
 	/* Analog Input subdevice */
 	s = &dev->subdevices[0];
 	s->type		= COMEDI_SUBD_AI;
-	s->subdev_flags	= SDF_READABLE | SDF_COMMON | SDF_GROUND | SDF_DIFF;
+	s->subdev_flags	= SDF_READABLE | SDF_COMMON | SDF_GROUND;
+	if (board->ai_diff_nchan)
+		s->subdev_flags	|= SDF_DIFF;
 	s->n_chan	= board->ai_nchan;
 	s->maxdata	= 0xffff;
 	s->len_chanlist	= ME4000_AI_CHANNEL_LIST_COUNT;