From: H Hartley Sweeten <hsweeten@visionengravers.com>
Date: Tue, 27 May 2014 17:30:58 +0000 (-0700)
Subject: staging: comedi: pcl816: fix DMA 'bytes' calculation
X-Git-Tag: firefly_0821_release~176^2~3465^2~39^2~44
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=b5fc9c1031407010ea308be15342bd01b848a853;p=firefly-linux-kernel-4.4.55.git

staging: comedi: pcl816: fix DMA 'bytes' calculation

The calculation for the total number of bytes in the DMA transfer
is incorrect. Fix 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/pcl816.c b/drivers/staging/comedi/drivers/pcl816.c
index 3742f5f78fc6..9c1b963a0bed 100644
--- a/drivers/staging/comedi/drivers/pcl816.c
+++ b/drivers/staging/comedi/drivers/pcl816.c
@@ -164,9 +164,7 @@ static void pcl816_ai_setup_dma(struct comedi_device *dev,
 	bytes = devpriv->hwdmasize;
 	if (cmd->stop_src == TRIG_COUNT) {
 		/*  how many */
-		bytes = s->async->cmd.chanlist_len *
-		s->async->cmd.chanlist_len *
-		sizeof(short);
+		bytes = cmd->stop_arg * cmd->chanlist_len * sizeof(short);
 
 		/*  how many DMA pages we must fill */
 		devpriv->dma_runs_to_end = bytes / devpriv->hwdmasize;