staging: comedi: ni_mio_common: fix M Series ni_ai_insn_read() data mask
authorIan Abbott <abbotti@mev.co.uk>
Mon, 14 Nov 2016 20:16:21 +0000 (20:16 +0000)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Tue, 15 Nov 2016 10:04:21 +0000 (11:04 +0100)
commit655c4d442d1213b617926cc6d54e2a9a793fb46b
tree915115ca2cbf9764e77c03b721187598cd54861e
parent29f22246477e4a754a198eb842271c83bda7a93c
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: 817144ae7fda ("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>
drivers/staging/comedi/drivers/ni_mio_common.c