remove bogus bug warning

diff --git a/comedi/drivers/ni_mio_common.c b/comedi/drivers/ni_mio_common.c
index df14f87ee7bab39ca5f893fa07b6fae25d32808c..bf415a010ba37276cb383e73f0ef4b30288439bd 100644 (file)
--- a/comedi/drivers/ni_mio_common.c
+++ b/comedi/drivers/ni_mio_common.c
@@ -409,6 +409,9 @@ static void ni_sync_ai_dma(struct mite_struct *mite, comedi_device *dev)
        comedi_buf_write_alloc(s->async, s->async->prealloc_bufsz);
 
        nbytes = mite_bytes_transferred(mite, AI_DMA_CHAN);
+       /* XXX should use mite_bytes_read() for the overrun check
+        * since mite_bytes_transferred returns a conservative
+        * lower bound */
        if( (int)(nbytes - old_alloc_count) > 0 ){
                printk("ni_mio_common: DMA overwrite of free area\n");
                ni_ai_reset(dev,s);
@@ -418,7 +421,8 @@ static void ni_sync_ai_dma(struct mite_struct *mite, comedi_device *dev)
 
        count = nbytes - async->buf_write_count;
        if( count < 0 ){
-               rt_printk("ni_mio_common: BUG: negative ai count\n");
+               /* it's possible count will be negative due to
+                * conservative value returned by mite_bytes_transferred */
                return;
        }