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staging: comedi: ni_mio_common: ack ai fifo error interrupts. 

Ack ai fifo error interrupts in interrupt handler to clear interrupt
after fifo overflow.  It should prevent lock-ups after the ai fifo
overflows.

Cc: <stable@vger.kernel.org> # v4.2+
Signed-off-by: Frank Mori Hess <fmh6jj@gmail.com>
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Frank Mori Hess 2018-03-15 10:25:44 +00:00 committed by Greg Kroah-Hartman
parent 988f4a3b6a
commit e1d9fc04c4
1 changed files with 2 additions and 0 deletions
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2
drivers/staging/comedi/drivers/ni_mio_common.c
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@ -1275,6 +1275,8 @@ static void ack_a_interrupt(struct comedi_device *dev, unsigned short a_status)
ack |= NISTC_INTA_ACK_AI_START;
if (a_status & NISTC_AI_STATUS1_STOP)
ack |= NISTC_INTA_ACK_AI_STOP;
if (a_status & NISTC_AI_STATUS1_OVER)
ack |= NISTC_INTA_ACK_AI_ERR;
if (ack)
ni_stc_writew(dev, ack, NISTC_INTA_ACK_REG);
}