From: H Hartley Sweeten Date: Wed, 5 Aug 2015 17:44:40 +0000 (-0700) Subject: staging: comedi: me4000: only set SDF_DIFF when supported X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=31bebc030fb2a6e2e7e7ea19ce58a0f196280281;p=openwrt%2Fstaging%2Fblogic.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 Reviewed-by: Ian Abbott Signed-off-by: Greg Kroah-Hartman --- 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;