This is a note to let you know that I've just added the patch titled
staging: comedi: adv_pci1710: fix analog output readback value
to the 3.12-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
staging-comedi-adv_pci1710-fix-analog-output-readback-value.patch
and it can be found in the queue-3.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 1e85c1ea1ff2a60659e790ef8ec76c7339445841 Mon Sep 17 00:00:00 2001
From: H Hartley Sweeten <hsweeten@xxxxxxxxxxxxxxxxxxx>
Date: Wed, 5 Feb 2014 14:59:53 -0700
Subject: staging: comedi: adv_pci1710: fix analog output readback value
From: H Hartley Sweeten <hsweeten@xxxxxxxxxxxxxxxxxxx>
commit 1e85c1ea1ff2a60659e790ef8ec76c7339445841 upstream.
The last value written to a analog output channel is cached in the
private data of this driver for readback.
Currently, the wrong value is cached in the (*insn_write) functions.
The current code stores the data[n] value for readback afer the loop
has written all the values. At this time 'n' points past the end of
the data array.
Fix the functions by using a local variable to hold the data being
written to the analog output channel. This variable is then used
after the loop is complete to store the readback value. The current
value is retrieved before the loop in case no values are actually
written..
Signed-off-by: H Hartley Sweeten <hsweeten@xxxxxxxxxxxxxxxxxxx>
Reviewed-by: Ian Abbott <abbotti@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/staging/comedi/drivers/adv_pci1710.c | 17 ++++++++++++-----
1 file changed, 12 insertions(+), 5 deletions(-)
--- a/drivers/staging/comedi/drivers/adv_pci1710.c
+++ b/drivers/staging/comedi/drivers/adv_pci1710.c
@@ -490,6 +490,7 @@ static int pci171x_insn_write_ao(struct
struct comedi_insn *insn, unsigned int *data)
{
struct pci1710_private *devpriv = dev->private;
+ unsigned int val;
int n, chan, range, ofs;
chan = CR_CHAN(insn->chanspec);
@@ -505,11 +506,14 @@ static int pci171x_insn_write_ao(struct
outw(devpriv->da_ranges, dev->iobase + PCI171x_DAREF);
ofs = PCI171x_DA1;
}
+ val = devpriv->ao_data[chan];
- for (n = 0; n < insn->n; n++)
- outw(data[n], dev->iobase + ofs);
+ for (n = 0; n < insn->n; n++) {
+ val = data[n];
+ outw(val, dev->iobase + ofs);
+ }
- devpriv->ao_data[chan] = data[n];
+ devpriv->ao_data[chan] = val;
return n;
@@ -679,6 +683,7 @@ static int pci1720_insn_write_ao(struct
struct comedi_insn *insn, unsigned int *data)
{
struct pci1710_private *devpriv = dev->private;
+ unsigned int val;
int n, rangereg, chan;
chan = CR_CHAN(insn->chanspec);
@@ -688,13 +693,15 @@ static int pci1720_insn_write_ao(struct
outb(rangereg, dev->iobase + PCI1720_RANGE);
devpriv->da_ranges = rangereg;
}
+ val = devpriv->ao_data[chan];
for (n = 0; n < insn->n; n++) {
- outw(data[n], dev->iobase + PCI1720_DA0 + (chan << 1));
+ val = data[n];
+ outw(val, dev->iobase + PCI1720_DA0 + (chan << 1));
outb(0, dev->iobase + PCI1720_SYNCOUT); /* update outputs */
}
- devpriv->ao_data[chan] = data[n];
+ devpriv->ao_data[chan] = val;
return n;
}
Patches currently in stable-queue which might be from hsweeten@xxxxxxxxxxxxxxxxxxx are
queue-3.12/staging-comedi-adv_pci1710-fix-analog-output-readback-value.patch
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