From: H Hartley Sweeten <hsweeten@visionengravers.com>
Date: Wed, 22 Oct 2014 21:36:44 +0000 (-0700)
Subject: staging: comedi: amplc_pci230: use comedi_buf_read_samples()
X-Git-Tag: v3.19-rc1~66^2~786
X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=dec1a2668629755b4c926f1473ecd2615d3a3d73;p=uclinux-h8%2Flinux.git

staging: comedi: amplc_pci230: use comedi_buf_read_samples()

Use comedi_buf_read_samples() to read the analog output samples from
the async buffer. That function will set the COMEDI_CB_BLOCK event
when samples are read from the async buffer. In addition, the core
will also handle the end-of-scan detection and set the COMEDI_CB_EOS
event.

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/amplc_pci230.c b/drivers/staging/comedi/drivers/amplc_pci230.c
index a3b34d881a08..f9b952f7173e 100644
--- a/drivers/staging/comedi/drivers/amplc_pci230.c
+++ b/drivers/staging/comedi/drivers/amplc_pci230.c
@@ -1075,26 +1075,25 @@ static void pci230_handle_ao_nofifo(struct comedi_device *dev,
 				    struct comedi_subdevice *s)
 {
 	struct pci230_private *devpriv = dev->private;
-	unsigned short data;
-	int i, ret;
 	struct comedi_async *async = s->async;
 	struct comedi_cmd *cmd = &async->cmd;
+	unsigned short data;
+	int i;
 
 	if (cmd->stop_src == TRIG_COUNT && devpriv->ao_scan_count == 0)
 		return;
+
 	for (i = 0; i < cmd->chanlist_len; i++) {
 		unsigned int chan = CR_CHAN(cmd->chanlist[i]);
 
-		/* Read sample from Comedi's circular buffer. */
-		ret = comedi_buf_get(s, &data);
-		if (ret == 0) {
-			s->async->events |= COMEDI_CB_OVERFLOW;
+		if (!comedi_buf_read_samples(s, &data, 1)) {
+			async->events |= COMEDI_CB_OVERFLOW;
 			return;
 		}
 		pci230_ao_write_nofifo(dev, data, chan);
 		s->readback[chan] = data;
 	}
-	async->events |= COMEDI_CB_BLOCK | COMEDI_CB_EOS;
+
 	if (cmd->stop_src == TRIG_COUNT) {
 		devpriv->ao_scan_count--;
 		if (devpriv->ao_scan_count == 0) {
@@ -1171,12 +1170,12 @@ static bool pci230_handle_ao_fifo(struct comedi_device *dev,
 				unsigned int chan = CR_CHAN(cmd->chanlist[i]);
 				unsigned short datum;
 
-				comedi_buf_get(s, &datum);
+				comedi_buf_read_samples(s, &datum, 1);
 				pci230_ao_write_fifo(dev, datum, chan);
 				s->readback[chan] = datum;
 			}
 		}
-		events |= COMEDI_CB_EOS | COMEDI_CB_BLOCK;
+
 		if (cmd->stop_src == TRIG_COUNT) {
 			devpriv->ao_scan_count -= num_scans;
 			if (devpriv->ao_scan_count == 0) {