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

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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: 817144ae7f ("staging: comedi: ni_mio_common: remove unnecessary use of 'board->adbits'")
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Cc: <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ian Abbott 2016-11-14 20:16:21 +00:00 committed by Greg Kroah-Hartman
parent 29f2224647
commit 655c4d442d
1 changed files with 1 additions and 1 deletions
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2
drivers/staging/comedi/drivers/ni_mio_common.c
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@ -1832,7 +1832,7 @@ static int ni_ai_insn_read(struct comedi_device *dev,
unsigned int *data)
{
struct ni_private *devpriv = dev->private;
unsigned int mask = (s->maxdata + 1) >> 1;
unsigned int mask = s->maxdata;
int i, n;
unsigned int signbits;
unsigned int d;