linux-kernel - [PATCH] staging: comedi: cb_pcidas: fix dac08_write

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Message-ID: <201206270917.19036.hartleys@visionengravers.com>
Date:	Wed, 27 Jun 2012 09:17:17 -0700
From:	H Hartley Sweeten <hartleys@...ionengravers.com>
To:	Linux Kernel <linux-kernel@...r.kernel.org>
CC:	<devel@...verdev.osuosl.org>, <abbotti@....co.uk>,
	<fmhess@...rs.sourceforge.net>, <gregkh@...uxfoundation.org>
Subject: [PATCH] staging: comedi: cb_pcidas: fix dac08_write_insn()

As pointed out by Ian Abbott, the comedi INSN_WRITE instructions
are meant to iterate over, and write, all the data[] passed from
the comedi core. Modify dac08_write_insn() to work as intended.

Since doc08_write_insn() now returns the proper response to the
core, make the dac08_write() helper return void.

Signed-off-by: H Hartley Sweeten <hsweeten@...ionengravers.com>
Reported-by: Ian Abbott <abbotti@....co.uk>
Cc: Frank Mori Hess <fmhess@...rs.sourceforge.net>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---

This is an incremental patch based on the previous series to
cleanup the cb_pcidas driver.

 drivers/staging/comedi/drivers/cb_pcidas.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/comedi/drivers/cb_pcidas.c b/drivers/staging/comedi/drivers/cb_pcidas.c
index 3ba75af..301444e 100644
--- a/drivers/staging/comedi/drivers/cb_pcidas.c
+++ b/drivers/staging/comedi/drivers/cb_pcidas.c
@@ -659,7 +659,7 @@ static int caldac_read_insn(struct comedi_device *dev,
 }
 
 /* 1602/16 pregain offset */
-static int dac08_write(struct comedi_device *dev, unsigned int value)
+static void dac08_write(struct comedi_device *dev, unsigned int value)
 {
 	struct cb_pcidas_private *devpriv = dev->private;
 	unsigned long cal_reg;
@@ -680,14 +680,18 @@ static int dac08_write(struct comedi_device *dev, unsigned int value)
 		outw(value, cal_reg);
 		udelay(1);
 	}
-	return 1;	/* insn->n */
 }
 
 static int dac08_write_insn(struct comedi_device *dev,
 			    struct comedi_subdevice *s,
 			    struct comedi_insn *insn, unsigned int *data)
 {
-	return dac08_write(dev, data[0]);
+	int i;
+
+	for (i = 0; i < insn->n; i++)
+		dac08_write(dev, data[i]);
+
+	return insn->n;
 }
 
 static int dac08_read_insn(struct comedi_device *dev,
-- 
1.7.11

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