From: David Schleef <ds@schleef.org>
Date: Thu, 10 Oct 2002 01:17:39 +0000 (+0000)
Subject: Fix problem detecting DMA overflows at buffer wraparound
X-Git-Tag: r0_7_66~74
X-Git-Url: http://git.tremily.us/gitweb.cgi?a=commitdiff_plain;h=656dfec754d57cb859d8de12dd13d35c97f88d66;p=comedi.git

Fix problem detecting DMA overflows at buffer wraparound
---

diff --git a/comedi/drivers/ni_mio_common.c b/comedi/drivers/ni_mio_common.c
index a97c63cd..daf501b9 100644
--- a/comedi/drivers/ni_mio_common.c
+++ b/comedi/drivers/ni_mio_common.c
@@ -355,7 +355,7 @@ static void mite_handle_a_linkc(struct mite_struct *mite, comedi_device *dev)
 	writel(CHOR_CLRLC, mite->mite_io_addr+MITE_CHOR+CHAN_OFFSET(mite->chan));
 
 	nbytes = mite_bytes_transferred(mite, 0);
-	if(nbytes >= async->buf_free_count){
+	if((int)(nbytes - async->buf_free_count) >= 0){
 		printk("ni_mio_common: BUG: DMA overwrite of free area\n");
 		ni_ai_reset(dev,s);
 		async->events |= COMEDI_CB_OVERFLOW;