Commit 655c4d44 authored by Ian Abbott's avatar Ian Abbott Committed by Greg Kroah-Hartman

staging: comedi: ni_mio_common: fix M Series ni_ai_insn_read() data mask

For NI M Series cards, the Comedi `insn_read` handler for the AI
subdevice is broken due to ANDing the value read from the AI FIFO data
register with an incorrect mask.  The incorrect mask clears all but the
most significant bit of the sample data.  It should preserve all the
sample data bits.  Correct it.

Fixes: 817144ae ("staging: comedi: ni_mio_common: remove unnecessary use of 'board->adbits'")
Signed-off-by: default avatarIan Abbott <abbotti@mev.co.uk>
Cc: <stable@vger.kernel.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 29f22246
...@@ -1832,7 +1832,7 @@ static int ni_ai_insn_read(struct comedi_device *dev, ...@@ -1832,7 +1832,7 @@ static int ni_ai_insn_read(struct comedi_device *dev,
unsigned int *data) unsigned int *data)
{ {
struct ni_private *devpriv = dev->private; struct ni_private *devpriv = dev->private;
unsigned int mask = (s->maxdata + 1) >> 1; unsigned int mask = s->maxdata;
int i, n; int i, n;
unsigned int signbits; unsigned int signbits;
unsigned int d; unsigned int d;
......
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