[PATCH 43/62] staging: comedi: das08: fix bug in das08_ao_winsn()

H Hartley Sweeten hsweeten at visionengravers.com
Mon Aug 25 23:04:36 UTC 2014


The comedi core expects (*insn_write) functions to write insn->n values
to the hardware and return the number of values written.

Currently, this function only writes the first value. Fix it to work
like the core expects.

For aesthetics, rename the function and tidy it up a bit.

Signed-off-by: H Hartley Sweeten <hsweeten at visionengravers.com>
Cc: Ian Abbott <abbotti at mev.co.uk>
Cc: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
---
 drivers/staging/comedi/drivers/das08.c | 21 ++++++++++-----------
 1 file changed, 10 insertions(+), 11 deletions(-)

diff --git a/drivers/staging/comedi/drivers/das08.c b/drivers/staging/comedi/drivers/das08.c
index 03b2c71..9a5a06b 100644
--- a/drivers/staging/comedi/drivers/das08.c
+++ b/drivers/staging/comedi/drivers/das08.c
@@ -369,19 +369,18 @@ static void das08_ao_initialize(struct comedi_device *dev,
 		das08_ao_set_data(dev, n, data);
 }
 
-static int das08_ao_winsn(struct comedi_device *dev,
-			  struct comedi_subdevice *s,
-			  struct comedi_insn *insn, unsigned int *data)
+static int das08_ao_insn_write(struct comedi_device *dev,
+			       struct comedi_subdevice *s,
+			       struct comedi_insn *insn,
+			       unsigned int *data)
 {
-	unsigned int n;
-	unsigned int chan;
-
-	chan = CR_CHAN(insn->chanspec);
+	unsigned int chan = CR_CHAN(insn->chanspec);
+	int i;
 
-	for (n = 0; n < insn->n; n++)
-		das08_ao_set_data(dev, chan, *data);
+	for (i = 0; i < insn->n; i++)
+		das08_ao_set_data(dev, chan, data[i]);
 
-	return n;
+	return insn->n;
 }
 
 static int das08_ao_rinsn(struct comedi_device *dev,
@@ -498,7 +497,7 @@ int das08_common_attach(struct comedi_device *dev, unsigned long iobase)
 		s->n_chan = 2;
 		s->maxdata = (1 << thisboard->ao_nbits) - 1;
 		s->range_table = &range_bipolar5;
-		s->insn_write = das08_ao_winsn;
+		s->insn_write = das08_ao_insn_write;
 		s->insn_read = das08_ao_rinsn;
 		das08_ao_initialize(dev, s);
 	} else {
-- 
2.0.3



More information about the devel mailing list