From: H Hartley Sweeten Date: Tue, 4 Mar 2014 18:29:35 +0000 (-0700) Subject: staging: comedi: pcl816: only hook up async command support if DMA is available X-Git-Tag: firefly_0821_release~176^2~4193^2~668 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=8429504a575ded74c6267361592879cedfb7b860;p=firefly-linux-kernel-4.4.55.git staging: comedi: pcl816: only hook up async command support if DMA is available This driver only supports async commands if a DMA channel is available. Modify the subdevice init so that the command support only gets hooked up if we can do DMA. Signed-off-by: H Hartley Sweeten Reviewed-by: Ian Abbott Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/staging/comedi/drivers/pcl816.c b/drivers/staging/comedi/drivers/pcl816.c index a4c59291568f..2498ab19daef 100644 --- a/drivers/staging/comedi/drivers/pcl816.c +++ b/drivers/staging/comedi/drivers/pcl816.c @@ -734,7 +734,7 @@ static int pcl816_attach(struct comedi_device *dev, struct comedi_devconfig *it) s->maxdata = board->ai_maxdata; s->range_table = &range_pcl816; s->insn_read = pcl816_ai_insn_read; - if (dev->irq) { + if (devpriv->dma) { dev->read_subdev = s; s->subdev_flags |= SDF_CMD_READ; s->len_chanlist = board->ai_chanlist;